First early Pliocene micromammal faunas from the Venta del Moro area (Cabriel Basin, Spain): new data on the Messinian dispersal of Debruijnimys.
Near the village of Venta del Moro (Valencia, Spain) part of the youngest sediments of the Cabriel Basin crop out in La Bullana area. In this zone, the lower part of the limestone Unit that forms the uppermost deposits from this basin includes a significant proportion of detrital deposits, containing several levels with remains of freshwater gastropods and vertebrates. In the sections of La Bullana 2 and La Bullana 3, four new localities have been located: La Bullana 2A (LB2A), La Bullana 2B (LB2B), La Bullana 3 (LB3) and La Bullana 3A (LB3A). Only two of them, La Bullana 2B and La Bullana 3, have yielded a significant number of fossil remains.
The paleontological research of the Jucar-Cabriel area has been fruitful, with two important Late Turolian (or Ventian, sensu Morales et al., 2013) macromammal localities, namely Venta del Moro (Morales, 1984; Montoya et al., 2006) and La Portera (Lacomba et al., 1986), along with a number of micromammal sites (see references in Montoya et al., 2006; Benavent et al., 2008; Mansino et al., 2009; Ruiz-Sanchez et al., 2011). Venta del Moro (6.23 Ma) is one of the key localities for understanding the environmental and faunal changes occurred just before the Messinian Salinity Crisis (5.96-5.33 Ma), with more than a hundred identified species, six of which have been described in this site (Montoya et al., 2006; Morales et al, 2011; Mansino et al., in press). The new localities of La Bullana 2B and La Bullana 3 are stratigraphically higher than the eastern localities of Venta del Moro and Los Mingos (Montoya et al., 2006; Benavent et al., 2008; Mansino et al., 2009) (Figs. 1-2).
In this paper we describe the fossil rodent faunas from La Bullana 2B and La Bullana 3, and discuss their chronostratigraphical, biostratigraphical and paleobiogeographical implications.
2. Material, methods and abbreviations
Field work during 2005 and 2007 provided over 1200 kg of sediment from La Bullana 2B and 1,500 kg from La Bullana 3. After sieving these sediments, the recovered fossils were kept at the Museu de Geologia de la Universitat de Valencia (MGUV), with the field labels LB2B- and LB3-, respectively. The nomenclature used in the descriptions of the teeth and the measurement methods are those of Martin-Suarez and Freudenthal (1993) for the family Muridae, Mein and Freudenthal (1971) for the Cricetidae, Daams (1981) and Freudenthal (2004) for the Gliridae, Cuenca-Bescos (1988) and Reumer and Van de Hoek Ostende (2003) for the Sciuridae, and Reumer (1984), modified by Furio (2007), for the insectivores. Measurements (L x W) are in millimetres and were taken on a Leica MZ75 binocular microscope, by means of displacement of a mechanical stage, connected to a Sony Magnescale measuring equipment. The lower teeth are indicated as ml, m2 and m3, the upper teeth as Ml, M2 and M3, the premolars as p4 and P4, and the deciduous elements as d4 and D4.
Abbreviations.- AL2-C, Alcoy-2C; AL2-D, Alcoy-2D; CLC, Calicasas; L, Length; LB2B, La Bullana 2B; LB3, La Bullana 3; MN, European Neogene land mammal Units; MNA, Mina; PUR, Purcal; SCSIE (UV), Servei Central de Suport a la Investigacio Experimental de la Universitat de Valencia; THC, Tollo de Chiclana; TLW, talonid width; TRW, trigonid width; W, Width.
3. Geological setting
The studied sites are located in the Cabriel Basin, a Neogene basin located between the Iberian platform to the North and Betic Cordillera to the South. The sedimentary infilling of the Cabriel Basin is mostly composed of Cenozoic limestones with detrital sediments (Fig. 1). The sedimentary record of this Basin contains several mammal sites ranging from the Late Aragonian to the Villanyian (MN7/8 to MN17) (see Ruiz- Sanchez et al. 2011 and references therein). The sites of La Bullana 2B and La Bullana 3 are located in the upper part of the Detritic Unit of Los Isidros, within the Venta del Moro-Villatoya Formation, according the stratigraphy described by Robles (1970) (Fig. 1). They are located approximately 3 km Southwest from the classic locality of Venta del Moro, about 10 m below La Molata, the top of the stratigraphic sequence (Fig. 2). However, the dip slope of La Bullana 2B and La Bullana 3 suggests that these localities may correspond to the same carbonated unit. The cross section of La Bullana 2, from where micromammal remains have been obtained, is mainly composed of detritic deposits, although it is crowned by a decametric layer of limestone. This outcrop includes several lignite levels and abundant fluvial sands, resting on red clays with intercalations of sandy channels. One kilometer Southeast from La Bullana 2B (30SXJ6394369), La Bullana 3 is located (30SXJ6404368), which probably represents an outcrop of equivalent deposits.
4. Systematic Paleontology
Order Rodentia Bowdich, 1821
Family Muridae Illiger, 1811
Genus Apodemus Kaup, 1826
Apodemus gorafensis Ruiz Bustos, Sese, Dabrio, Pena and
Padial, 1984 (Fig. 3, 1-4)
Localities: LB2B, LB3.
Material: 7 m1 (LB2B-25, LB2B-88, LB2B-92, LB2B-183, LB3-2, LB3-3, LB3-30), 9 m2 (LB2B-35, LB2B-36, LB2B41, LB2B-105, LB2B-142, LB3-10, LB3-11 to LB3-13), 8 m3 (LB2B-44, LB2B-45, LB2B-114, LB2B-115, LB2B-200, LB2B-203, LB3-17, LB3-18), 8 M1 (LB2B-9, LB2B-13, LB2B-51, LB2B-129, LB2B-250, LB2B-258, LB3-19, LB320), 4 M2 (LB2B-20, LB2B-21, LB2B-136, LB3-22), 4 M3 (LB2B-214, LB2B-216, LB2B-219, LB3-24).
Measurements: see Table 1.
m1: The tma is large, round and central. Symmetrical anteroconid, its labial lobe connects with the metaconid. Welldeveloped labial cingulid, with a big round c1 and two or three accessory cuspids. One of the specimens has a hint of longitudinal spur. Big oval posterior heel, shifted towards the lingual side of the tooth. Roots are not preserved.
m2: Big oval anterolabial cuspid. Well-developed labial cingulid, separated from the protoconid and hypoconid. There is a large round c1, except for one specimen in which this cuspid is much reduced, and one or two accessory cuspids. The posterior heel is large, round or oval. Roots are not preserved.
m3: Anterolabial cuspid reduced or absent. There is no longitudinal crest. One specimen has a small c1 connected to the labial side of the hypoconid-entoconid complex. Roots are not preserved.
M1: The t1 is displaced backwards. The connection between t1 and t2 is very low. There is neither t1 bis nor t2 bis. The valley between t3 and t6 is very deep and wide. The t4, t5, t6 and t9 are connected. The t7 is well developed, and there is a medium-sized t12 connected to the posterolabial side of t8. Roots are not preserved.
M2: The t1 is large, oval or round, and two specimens have a spur directed towards the t4-t5 connection. The t3 is reduced and isolated from the other cusps. The t7 is well developed and separated from t4. The t6 and t9 are connected. The t12 is small, connected to the posterolabial part of t8 and separated from t9. Roots are not preserved.
M3: The t1 is isolated. The t3 is absent. The t4, t5, t6, t8 and t9 are connected. Roots are not preserved.
[FIGURE 1 OMITTED]
The presence of a large tma in the m1, well-developed labial cingulid in m1 and m2 and t7 in the upper molars are typical traits of Apodemus. The specimens from LB2B and LB3 are larger than Apodemus atavus Heller, 1936 from TCH-1, 1B, 3 and 13 (Minwer-Barakar et al, 2005), PUR-7, PUR-13, CLC-3, CLC-3B, CLC-4B, AGU-1C and DHS-1 (Garcia-Alix et al, 2008a) and smaller than Apodemus jeanteti Michaux, 1967 from Arquillo 3 and Villalba Alta (Adrover, 1986); this latter species further differs from A. gorafensis in the lack of tma in the m1. Apodemus gorafensis differs from its ancestor, Apodemus gudrunae van de Weerd, 1976, in the presence of a well-developed t7. This latter species is also slightly smaller than our specimens. In addition, Apodemus agustii MartinSuarez, 1988 differs from A. gorafensis in the partial stephanodonty of the upper molars, less-developed tma and lack of a pit in m1 between the anteroconid, metaconid and protoconid. The size of the studied molars is consistent with A. gorafensis from its type locality, Gorafe A (Ruiz Bustos et al., 1984) and PUR-4, PUR-24A, PUR 25, PUR-25A, MNA-2 and MNA-4 (Garcia-Alix et al., 2008a), Gorafe-3, Gorafe-4, Botardo-C and Huescar-1 (Martin-Suarez, 1988) and Alcoy 2C and 2D (Mansino et al., 2013), being also similar to A. aff gorafensis from PUR 23 (Garcia-Alix et al., 2008a), Celadas 9, La Gloria 4 (Adrover et al., 1993) and Peralejos E (Adrover et al., 1988).
[FIGURE 2 OMITTED]
The development of the tma, labial cingulid and t7 in the specimens from La Bullana 2B and La Bullana 3 agrees with A. gorafensis. There is a t9 (Fig. 3, 4) in two M3, while other two are much worn and this cusp cannot be observed. This cusp is absent in the fossil remains of A. gorafensis from the mentioned localities, with the exceptions of some specimens from PUR-23 and PUR-24A (Garcia-Alix et al., 2008a).
Genus Castillomys Michaux, 1969
Castillomys gracilis van de Weerd, 1976 (Fig. 3, 5-7)
Material: 5 m1 (LB2B-90, LB2B-91, LB2B-94, LB2B-95, LB2B-188), 4 m2 (LB2B-106 to LB2B-109), 6 M1 (LB2B14, LB2B-125, LB2B-126, LB2B-204, LB2B-205, LB2B210) 1 M2 (LB2B-22), 1 M3 (LB2B-218).
Measurements: see Table 2.
m1: One specimen has a very small and low tma (Fig. 3, 5), absent in the rest. The anteroconid is symmetrical and connected to the protoconid-metaconid pair. There is a longitudinal spur and a narrow labial cingulid. The c1 is round or oval and connected basally to the hypoconid. One molar has a small accessory cuspid. The posterior heel is small and lingually displaced. Roots are not preserved.
m2: Large anterolabial cuspid, connected to the labial cingulid. There is a small round c1. All specimens have a longitudinal spur. The posterior heel is small and oval. Roots are not preserved.
M1: The t1 is displaced backwards. All specimens have a small t1 bis. The t1 is connected to the t4-t5 junction by a longitudinal crest. There is a small distal spur in t3, directed towards the t5-t6 connection, and one specimen has a low labial longitudinal crest. The t9 is large. A small t12 is present. Roots are not preserved.
M2: The only available specimen is broken anterolabially. The t1 is connected with the t4-t5 junction by a low crest. The t3 is small and isolated. Roots are not preserved.
M3: Isolated t1. There is no t3. The connection between t4 and the t5-t6 junction is very low. The t8 is isolated. Roots are not preserved.
Martin-Suarez and Mein (1991) recognized an increase in size from older to younger populations in the anagenetic line C. gracilis-C. crusafonti-C. rivas, in which all the Iberian populations from the Pliocene and Pleistocene could be encompassed. This means that the biometrics of the molars could be used as systematic criteria along the frequency percentages of some morphological characters (Martin-Suarez and Mein, 1991). The size of Castillomys from La Bullana 2B is consistent with Castillomys gracilis van de Weerd, 1976 from its type locality (Caravaca), and Orrios-1 (Weerd, 1976), Moreda-1A and 1B, Rambla Seca-AB and Belmez-1 (Castillo, 1990), Botardo C and Gorafe 3 and 4 (Martin-Suarez, 1988), Mont-Helene (Aguilar et al., 1986), Aldehuela and Villalba Alta (Adrover, 1986) and CLC-3, CLC-3B and PUR-13 (Garcia-Alix et al., 2008a), but also agrees with some of the smallest measurements of Castillomys crusafonti Michaux, 1969 (Martin-Suarez and Mein, 1991; MinwerBarakat et al., 2005).
The morphology of the studied specimens agrees better with C. gracilis than with C. crusafonti, showing a longitudinal spur in m1 and a posterior spur in t3 of M1 instead of full longitudinal crests. However, 1 out of 6 M1 does have a low longitudinal crest in t3, and all of them present a complete longitudinal crest connecting the t1 to the t4-t5, which is unusual in C. gracilis (Martin-Suarez and Mein, 1991). Moreover, the presence of a low crest in t1 of the M2 is rare in this species. However, based on the size of the specimens and the lack of longitudinal crests in the lower molars, we ascribe the sample from La Bullana 2B to C. gracilis.
Genus Occitanomys Michaux, 1969
Occitanomys brailloni Michaux, 1969 (Fig. 3, 8-13)
Material: 5 m1 (LB2B-53, LB2B-82, LB2B-93, LB2B96, LB2B-184), 2 m2 (LB2B-39, LB2B-100), 5 m3 (LB2B112, LB2B-113, LB2B-116, LB2B-119, LB2B-201), 4 M1
(LB2B-11, LB2B-123, LB2B-124, LB2B-251) 1 M2 (LB2B135).
Measurements: see Table 3.
ml: Symmetrical anteroconid, connected to the protoconid-metaconid pair by a narrow crest. The labial cingulid is well developed. The c1 is large and round. Two specimens have a very small accessory cuspid. There is a longitudinal spur, which is reduced in two molars (Fig. 3, 8), more developed in other two, and developed into a very low longitudinal crest in one specimen (Fig. 3, 9). The posterior heel is small and oval. There are two roots.
m2: Trapezoidal outline, with the anterior side wider than the posterior one. Big round anterolabial cuspid, connected basally to the protoconid. The labial cingulid is reduced. The two available specimens have a longitudinal spur. The posterior heel is round. Roots are not preserved.
m3: There is neither anterolabial cuspid nor c1. Roots are not preserved.
M1 : The connection between t1 and t2 is very low. The t1 bis is well developed. There is a small t2 bis (Fig. 3, 12), absent in one specimen. There is a low connection between t1 and the anterolingual side of t5. One specimen has a hint of distal spur in t3. The t6 and t9 are connected. The t12 is very small, barely a fold of the enamel. Roots are not preserved.
M2: The t1 is well developed, connected to the anterolingual side of t5 in one molar (Fig. 3, 13) and isolated in the other one. One specimen has a large t1 bis (Fig. 3, 13). Reduced t3, isolated from the other cusps. The t9 is well developed. Roots are not preserved.
The specimens from La Bullana 2B largely agree with the material of O. brailloni from Layna (type locality) described by Michaux (1969): m1 without tma and with the accessory cuspids less developed than Apodemus, M1 with t1 bis, a crest that connects t1 to the posterior crown and a much reduced t12, and M2 with reduced t3 and well-developed t1 connected to the t5 by a crest. Michaux (1969) also considered diagnostic the presence of a low longitudinal crest in m1, lower than in Stephanomys. Regarding this character, there seems to be a great variability among populations, and Adrover (1986) suggested an increase of the longitudinal crest in m1 and m2 through time. In the localities of the MN14 the longitudinal crest of m1 is developed in 3 out of 7 molars from Kardia and Ptolemais (Weerd, 1979), absent in the single m1 from Gorafe A (Ruiz Bustos et al., 1984), and present in 1 out of 5 specimens from La Bullana 2B. In localities assigned to the early MN15, this crest is present in 2 out of 7 specimens from Arquillo 3 (Adrover, 1986), and absent in the two m1 from Vorio 3 (Hordijk and de Bruijn, 2009). In more recent localities, such as Layna, Nimes (Michaux, 1969) and TCH1B (Minwer-Barakat et al., 2005) there is always a low longitudinal crest.
The distal crests in M1 show also a great variability. The specimens from Kardia (Weerd, 1979) have a crest on t1, and 1 out of 4 molars have also a crest on t3, while other two have a small spur. The single M1 from Gorafe A has a weak t1-t5 connection, and no trace of t3-t5 connection (Ruiz Bustos et al., 1984). In the specimens from La Bullana 2B, the crest on t1 is high in one molar and much lower in the other one, while 2 out of 3 specimens have a much reduced spur on t3 (Fig. 3, 11). All specimens from Arquillo 3 have a crest on t1, and 4 out of 6 M1 have a spur on t3 (Adrover, 1986). In the Greek locality of Vorio 3 (Hordijk and de Bruijn, 2009) all M1 have a crest on t1, two molars have a spur on t3 and another one a developed crest. In Layna and Nimes there is always a crest on t1, but the t3 has a spur (Michaux, 1969). The single M1 from TCH-1B has well-developed crests on t1 and t3 (Minwer-Barakat et al., 2005). The single specimen from Rambla Seca A1 also has developed crests, but lower than in the molar from TCH-1B (Minwer-Barakat, 2005). Each of the localities Canada del Castano 1 and Rambla Seca A2 yielded one M1, with a low crest on t3 and an isolated t1, while in the two M1 from Belmez 1 the t1 has a low crest, and one specimen has a crest on t3, absent in the other one (Castillo, 1990; Martin-Suarez, 1988). The morphological variability of these connections is difficult to assess because of the scarcity of the remains in the localities where this species is found (Minwer-Barakat, 2005), although they seem to be slightly more developed in younger localities.
With respect to the size, the material from La Bullana 2B is similar in size to O. brailloni from other MN14 localities such as Ptolemais 1 and 3 and Kardia (Weerd, 1979), Gorafe A (Ruiz Bustos et al., 1984) and Vorio 1 (Hordijk and de Bruijn, 2009), and slightly smaller than the same taxon from MN15 localities such as Vorio 3 (Hordijk and de Bruijn, 2009), Arquillo 3 and Aldehuela (Adrover, 1986), Layna, Nimes and Sete (Michaux, 1969), Canada del Castano 1 (Martin-Suarez, 1988), TCH-1B (Minwer-Barakat et al., 2005), Belmez 1, Rambla Seca A1, A2 and A3, Moreda 1L-4 and the MN16 locality of Moreda 1B (Castillo, 1990). The scarce material from AL2-D (Mansino et al., 2013) is morphologically con sistent with O. brailloni, but due to its extremely large size it is not clear if these specimens should be ascribed to this taxon or to a related form.
[FIGURE 3 OMITTED]
O. brailloni differs from O. alcalai Adrover, Mein and Moissenet, 1988, O. adroveri (Thaler, 1966), O. sondaari van de Weerd, 1976 and O. debruijni Sen, Jaeger, Dalfes, Mazin and Bochernes, 1989, by its larger size. It differs from O. montheleni Aguilar, Calvet and Michaux, 1984, by its smaller size. Some of the specimens from La Bullana 2B are close to the smallest values of O. brailloni, and therefore close to the largest dimensions of O. alcalai and within the size range of O. adroveri. O. sondaari differs from O. brailloni by the weak t6-t9 junction, the lesser development of the longitudinal crest in m1, the absence of t1-t5 connection in unworn specimens and by the absence of a crest on the t3 of the M1. O. alcalai differs from O. brailloni by the lesser development of longitudinal crests in the upper and lower molars. According to Michaux (1969), the longitudinal crest of O. adroveri is less developed than in O. brailloni, but as we noted before this character shows a great variability. The m1 of O. adroveri may present well-developed accessory cuspids. In the upper molars, the distal crests on t1 and t3 are usually more developed in O. brailloni than in O. adroveri, and the t12 is more reduced in O. brailloni. O. debruijni differs from O. brailloni by the reduced or absent t3-t5 connection and absence of c1 in m2, which may be present in O. brailloni (see material from Layna and Vorio 3 in Hordijk and de Bruijn, 2009, plate 8).
Material: 1 M2 (LB2B-211).
M2: (1.38 x 1.32): The t1 is well developed, and connects basally with the t5. The t3 is smaller than the t1 and isolated from the other cusps. The t9 is well developed. Roots are not preserved.
The general morphology of the specimen resembles Occitanomys, but it is much smaller than the remains ascribed to O. brailloni. In addition, the t1-t5 connection is very low, while in O. alcalai it is usually higher. Because of the scarcity of the material that prevents the observation of more diagnostic features, we ascribe this molar to Occitanomys sp.
Genus Paraethomys Petter, 1968
Paraethomys aff. abaigari Adrover, Mein and Moissenet, 1988 (Fig. 3, 18-22)
Localities: LB2B, LB3.
Material: 5 m1 (LB2B-87, LB2B-99, LB2B-187, LB2B189, LB3-1), 13 m2 (LB2B-2, LB2B-34, LB2B-38, LB2B40, LB2B-42, LB2B-86, LB2B-103, LB2B-110, LB2B 191, LB3-7 to LB3-9, LB3-14), 7 m3 (LB2B-3, LB2B-47, LB2B-48, LB2B-118, LB2B-121, LB2B-195, LB2B-197), 6 M1 (LB2B-4, LB2B-15, LB2B-128, LB2B-206, LB2B-208, LB2B-209), 6 M2 (LB2B-17, LB2B-18, LB2B-130, LB2B134, LB2B-212, LB2B-213), 4 M3 (LB2B-139, LB2B-140, LB2B-215, LB2B-217).
Measurements: see Table 4.
m1: One molar has a very small cingulid ridge between the lobes of the anteroconid (Fig. 3, 18) and another one shows a low and small tma. The anteroconid is slightly asymmetrical. The anteroconid and the protoconid-metaconid pairs are connected by a narrow crest, which has an enamel funnel in one specimen. There is a longitudinal spur. The labial cingulid is moderately developed, with a large oval c1 and one or two accessory cuspids. The posterior heel is variable in size and shape, and lingually displaced. Roots are not preserved.
m2: Well-developed anterolabial cuspid, connected basally to the protoconid and the labial cingulid. A c1 variable in size and an accessory cuspid may be present. There is a longitudinal spur in 9 out of 11 specimens. The posterior heel is reduced in some molars, while others have a medium sized cuspid. Roots are not preserved.
m3: The anterolabial cuspid is reduced in two specimens and absent in five. The hypoconid-entoconid complex is separated from the protoconid-metaconid pair. One of the specimens presents a small c1 attached to the labial side of the posterior complex. Roots are not preserved.
M1: The connection between t1 and t2 is lower than the connection between t2 and t3. The t2 and t3 are very close together. Two specimens have a very low crest connecting t1 with the posterolingual side of t5. The spur in t3 is always present, small in two specimens and more developed in other two. The t9 is well developed. The connection between t4 and t8 is low. There is a small t12. Roots are not preserved.
M2: Isolated t1 and t3. The t9 may be absent (2), reduced (2) or developed (1). A much reduced t12 is present in two specimens. Roots are not preserved.
M3: The t1 is large and isolated, while t3 is absent. The t8 is connected with the t4-t5-t6 junction. Roots are not preserved.
Different species of Paraethomys are recognized in MN14 localities from the Iberian Peninsula: the small sized P. meini (Michaux, 1969), and the larger P abaigari and P. aff. abaigari, which have more developed distal spurs in the upper molars. Adrover et al. (1993) identified two species of Paraethomys in La Gloria 4 and Celadas 1 and 9, P. meini and P anomalus (Bruijn, Dawson and Mein, 1970). These two species were morphologically very similar, and differed mainly in their size. Later, Garcia-Alix et al. (2008a) ascribed the big-sized specimens from PUR-13 and CLC-5A to P. aff. abaigari, a form related to P abaigari but slightly smaller, and considered the big-sized Paraethomys from La Gloria 4 and Celadas 9 to belong to the same taxon. Slightly older assemblages of Paraethomys, like the rich population from PUR-4, show a wide size range but, due to the impossibility to discriminate two clusters in this population, Garcia-Alix et al. (2008a) ascribed that sample to P. meini, considering unlikely the coexistence of two Paraethomys species in that locality.
The specimens from La Bullana 2B and La Bullana 3 are similar in size to P aff. abaigari from CLC-5A and PUR13 (Garcia-Alix et al., 2008a), Celadas 9 and La Gloria 4 (Adrover et al., 1993), slightly smaller than P. aff. abaigari from AL2-C and AL2-D (Mansino et al., 2013), and clearly smaller than P. abaigari from Villalba Alta (Adrover et al., 1988). These molars are larger than P. meini from Sete (type locality), Layna, Nimes, La Juliana, Arquillo III, Villalba Alta, Perpignan, Aldehuela, Orrios (Adrover, 1986), Villalba Alta Rio, Peralejos E (Adrover et al., 1988), Celadas 9 and La Gloria 4 (Adrover et al., 1993), PUR-3, 4, 7 and 13, CLC-3, 3A, 4A, 4B, 5A, CAC-11,BRA-5B, DHS-1, 4A, 4B, 15B, 16 and MNA-4 (Garcia Alix et al., 2008b) and Rambla de Chimeneas 3 (Minwer-Barakat et al., 2009a), P. anomalus from Maritsa and P. miocaenicus from Khendek el Ouaich (Adrover, 1986), considered synonyms of P meini by several authors (van de Weerd, 1976; Adrover, 1986; Castillo, 1990; Minwer-Barakat, 2005; Garcia-Alix, 2006, Garcia-Alixet et al., 2008a)
The development of distal spurs on the t1 and t3 of the M1 also agrees with P. abaigari rather than with P. meini. For these reasons, we ascribe the studied material to P. aff. abaigari.
Paraethomys meini (Michaux, 1969) (Fig. 3, 14-17)
Material: 12 m1 (LB2B-1, LB2B-26, LB2B-29 to LB2B33, LB2B-83, LB2B-85, LB2B-89, LB2B-185, LB2B-186), 2 m2 (LB2B-100, LB2B-193), 6 m3 (LB2B-46, LB2B50, LB2B-120, LB2B-122, LB2B-194, LB2B-198), 3 M1 (LB2B-16, LB2B-52, LB2B-84), 2 M2 (LB2B-19, LB2B131), 1 M3 (LB2B-138).
Measurements: see Table 4.
m1: one specimen has a very low and small tma. The anteroconid is slightly asymmetrical. The anteroconid and the protoconid-metaconid pair are connected by a narrow crest. Three specimens have a funnel of enamel in the connection between the anteroconid and the protoconid-metaconid (Fig. 3, 14). In 8 out of 11 teeth there is a weak longitudinal spur. The labial cingulid is moderately developed, with a large oval c1 and one or two accessory cuspids, variable in size. Roots are not preserved.
m2: Well-developed anterolabial cuspid, connected basally to the protoconid and the labial cingulid. A small c1 is present in one specimen. There are no accessory cuspids. In 2 out of 3 specimens there is a longitudinal spur. The posterior heel is large in two molars and more reduced in another one. Roots are not preserved.
m3: One specimen has a small anterolabial cuspid, absent in the others. The hypoconid-entoconid complex is separated from the anterior protoconid-metaconid pair. A small crestshaped c1 is present in two molars. Roots are not preserved.
M1: All specimens are broken posteriorly. One specimen has two small cusps attached to the anterior side of t2. The t1 has a distal spur, developed into a very low crest in one of the specimens. There is a spur on the t3. Roots are not preserved.
M2: The dentine is almost completely lost in both molars. Isolated t1 and t3. The t9 is slightly developed, and there is no t12. Roots are not preserved.
M3: The t1 is large and isolated. Absent t3. The t8 is connected to the t4-t5-t6 junction. Roots are not preserved.
Together with the large P. aff. abaigari, a small form of Paraethomys occurs in La Bullana 2B. The coexistence of two species of Paraethomys differing mainly in size has been recorded in several Pliocene localities from the Teruel and Granada Basins (Adrover, 1986; Adrover et al., 1988, 1993; Garcia-Alix et al., 2008a), as well as in the French site of Sete (type locality of P meini, Michaux, 1969). When both forms appear together, the size of P. meini is usually very small (Garcia-Alix, 2006). The size of the specimens from La Bullana 2B is similar to P. meini from Sete, Layna, Nimes, La Juliana, Arquillo III, Villalba Alta, Perpignan, Aldehuela, Orrios (Adrover, 1986), Villalba Alta Rio, Peralejos E (Adrover et al., 1988), Celadas 9 and La Gloria 4 (Adrover et al., 1993), PUR-3, 4, 7 and 13, CLC-3, 3A, 4A, 4B, 5A, CAC-11,BRA5B, DHS-1, 4A, 4B, 15B, 16 and MNA-4 (GarciaAlix et al, 2008b) and Rambla de Chimeneas 3 (Minwer-Barakat et al, 2009a), P anomalus from Maritsa and P miocaenicus from Khendek el Ouaich (Adrover, 1986).
The only morphological character used to distinguish P. meini from P abaigari is the development of distal spurs in the upper molars, more prevalent in the latter species (Adrover et al., 1993). The three M1 from La Bullana 2B show spurs on the t1 and t3, which is unusual in P. meini, although in some localities like Peralejos E the presence of spurs in t1 and especially t3 is quite common (Adrover et al., 1993).
Genus Stephanomys Schaub, 1938
Stephanomys dubari Aguilar, Michaux, Bachelet, Calvet and
Faillat, 1991 (Fig. 3, 23-28)
Localities: LB2B, LB3.
Material: 5 m1 (LB2B-27, LB2B-28, LB2B-97, LB2B-98, LB2B-182), 5 m2 (LB2B-37, LB2B-101, LB2B-102, LB2B104, LB2B-111), 4 m3 (LB2B-49, LB2B-117, LB2B-196, LB2B-197), 4 M1 (LB2B-10, LB2B-12, LB2B-127, LB2B207), 5 M2 (LB2B-23, LB2B-132, LB2B-133, LB2B-252, LB3-21), 3 M3 (LB2B-24, LB2B-137, LB2B-249).
Measurements: see Table 5.
ml: Slightly asymmetrical anteroconid, connected to the protoconid and metaconid. The labial cingulid is low and narrow. There is a well-developed longitudinal crest that connects the posterior cuspids to the connection of the protoconid-metaconid pair. There is a well-developed oval c1. The posterior heel is lingually displaced, ranging from oval to laminar. Two roots.
m2: Large and high anterolabial cuspid, connected to the protoconid and to a narrow labial cingulid. The longitudinal crest is lingually displaced towards the metaconid. There is neither c1 nor accessory cuspids. The posterior heel is large and oval. Roots are not preserved.
m3: Small and low anterolabial cuspid, connected to the protoconid. The longitudinal crest is complete (Fig. 3, 24). There are two roots.
M1: The t1 is slightly displaced backwards. There are small t1 bis and t2 bis, more developed in one of the specimens (Fig. 3, 25). The posterior crest on the t1 is high and well developed in two specimens (Fig. 3, 25), and very low in other two (Fig. 3, 26), while the posterior crest on the t3 is high in all specimens. The t12 is highly reduced. Roots are not preserved.
M2: The t1 has a small t1 bis attached to its anterior side (Fig. 3, 27). In unworn specimens, the posterior crest of t1 is complete in two molars and low in another two, while the posterior crest on the t3 is complete in two specimens, low in one and absent in another one. The t12 is reduced in one molar and well developed in another one (Fig. 3, 27). There are three roots.
M3: The t1 is connected basally to t5. The t3 is absent. The t4, t5 and t6 are connected to t8. One specimen has a t9 (Fig. 3, 28). Roots are not preserved.
The great height of the crown, high longitudinal crests in the lower molars (Fig. 3, 23-24) and crests or spurs in t1 and t3 of the upper molars (Fig. 3, 25-27) indicate that these specimens belong to the genus Stephanomys. These molars are smaller, lower crowned and have a less pronounced stephanodonty than the Stephanomys identified in the Pliocene and Pleistocene (see Minwer-Barakat et al., 2011 and references therein).
The studied specimens share some characters with S. cordii Ruiz Bustos, 1986, like the t1 slightly more posterior than the t3 in M1 (Fig. 3, 25-26) and one m3 with the longitudinal crest connected to the protoconid (Fig. 3, 24). However, although some molars have the size and morphology of S. cordii (Fig. 3, 25) most of them agree better with S. dubari Aguilar, Michaux, Bachelet, Calvet and Faillat, 1991, with low crests connecting t1 and t5 in M1 (Fig. 3, 26), low or absent longitudinal crests in M2 and a smaller size. The presence of specimens similar to S. cordii has been reported in some populations of S. dubari, such as in the lower Ruscinian sites of PUR-4 and PUR-13 in the Granada Basin (Garcia-Alix et al., 2008a). The material from La Bullana 2B and La Bullana 3 has been directly compared with S. cordii from AL2-C and AL2-D (Mansino et al., 2013). The molars from the two latter localities are slightly larger, having usually higher longitudinal crests and are clearly higher crowned than the teeth from La Bullana 2B and La Bullana 3. For these reasons, we ascribe the material from the studied localities to S. dubari.
[FIGURE 4 OMITTED]
Family Gerbillidae Alston, 1876
Subfamily Taterillinae Chaline, Mein and Petter, 1977
Genus Debruijnimys Castillo and Agusti, 1996
Debruijnimys cf. julii Castillo and Agusti, 1996 (Fig. 5, 1)
Material: 1 M1 (LB2B-248).
M1: (2.78 x 2.03): The anterocone is sub-triangular, with a flat anterior face. An indentation on the anterior face of the anterocone subdivides this cusp into two lobes. There is a posterior spur on the lingual lobe of the anterocone, directed towards the protocone-paracone junction. The anterocone and the protocone are linked by a low longitudinal ridge. The protocone and paracone are equivalent in size, and separated from the hypocone-metacone complex by a deep valley. The posterior walls of the protocone and the paracone show low posterior spurs that connect, at medium level, to the hypocone and the metacone, respectively. The hypocone is larger than the metacone, and posteriorly displaced. There is a shallow furrow between hypocone and metacone. Roots are not preserved.
In the Iberian Peninsula several Late Miocene and Early Pliocene localities have yielded remains of Debruijnimys Castillo and Agusti, 1996 (see Agusti and Casanovas-Vilar, 2003 and Minwer-Barakat et al., 2009b). The record of Debruijnimys in Spain comprises two species: D. almenarensis (Agusti, 1990) from the Late Miocene (MN13) and D. julii Castillo and Agusti, 1996 from the middle Pliocene (MN15). Debruijnimys almenarensis is recorded in Salobrena, Almenara M, Zorreras 2B and 3A, and Negratin-1 (Agusti, 1990; Agusti, 1991; Martin-Suarez et al., 2000; Minwer-Barakat et al., 2009b; Agusti et al., 2011) and D. julii in Asta Regia-3 (Castillo and Agusti, 1996).
Other Spanish localities of Early Ruscinian age (MN14) with presence of the genus Debruijnimys are Alcoy, Caravaca, Gorafe 1, Botardo, Bacochas 1 and La Gloria 4 (Sese, 1989; Agusti, 1991; Castillo and Agusti, 1996 and MinwerBarakat et al., 2009b) (Fig. 4). The scarcity of material in these localities led the authors to determine these specimens as Debruijnimys sp.; Agusti and Casanovas-Vilar (2003) considered that all these samples from the Ruscinian referred to Debruijnimys sp. were forms related to D. julii.
The phylogenetic relationship of the Spanish forms of Debruijnimys is not clear. Thus, the larger size and the presence of derived characters in D. almenarensis (MN13), like the very large anteroconid, led Agusti and Casanovas-Vilar (2003) to refuse an ancestor-descendant relationship between D. almenarensis and the Spanish material of Debruijnimys from the Early Ruscinian (MN14). According to these authors, the forms of Debruijnimys of Early Ruscinian age would be an intermediate step in a phylogenetic lineage comprising D. davidi from Lissafa (Morocco) (Late Turolian, MN13, 5.5 Ma) (Raynal et al., 1999) and D. julii from Asta Regia 3 (Late Ruscinian, MN15).
[FIGURE 5 OMITTED]
The upper molars of D. julii differ from those of D. almenarensis by several characters, like the presence of a weak indentation on the anterior face of the anterocone that creates two confluent lobes and the degree of separation between the protocone-paracone and hypocone-metacone pairs. While in D. almenarensis there is a wide valley, without posterior spurs (Fig. 5, 2), in D. julii there is a low connection between the posterior walls of the protocone and paracone and the anterior sides of the hypocone and metacone, respectively (Fig. 5, 1) (Castillo and Agusti, 1996, Plate 1, Fig. 4-5). Moreover, the shape of the M1, sub-rectangular in the M1 of D. almenarensis (Fig. 5, 2) and more rounded in D. julii (Fig. 5, 1) is another difference between both species.
Minwer-Barakat et al. (2009b) observed an increase in size from D. davidi from Lissasfa to D. julii from Asta Regia. The size of the material of the Early Ruscinian Spanish populations of Debruijnimys is similar to that of D. julii (Castillo and Agusti, 1996) and much larger than that of D. davidi from Lissasfa (Geraads, 1998). The M1 from La Bullana 2B is much larger than those of D. davidi from Lissasfa and very similar in size to those of D. almenarensis and D. julii (Agusti, 1990; Martin Suarez et al.; 2000; Minwer-Barakat et al. 2009b).
Moreover, the M1 from La Bullana 2B clearly differs from those of Lissasfa in the morphology of hypocone-metacone pair. While in Lissasfa the metacone is placed posteriorly with respect to the hypocone, in La Bullana 2B the metacone is placed anteriorly. In the single M1 from La Bullana 2B, the metacone is placed in a more anterior position with respect to the hypocone than in D. almenarensis from its type locality, Almenara M (Fig. 5, 2), and similar to that of D. julii (Castillo and Agusti, 1996).
The morphology of the anterocone of the M1 from La Bullana 2B is more similar to D. almenarensis and D. julii than to D. davidi. The presence of a weak indentation on the anterior face of the anterocone, that creates two confluent lobes, is present in D. julii and, in a lesser degree, also in D. almenarensis from Almenara M (Fig. 5, 2), and in Debruijnimys from La Bullana 2B, being absent in the M1 of D. davidi from Lissasfa. The absence of lower dentition and other elements of the upper dentition in La Bullana 2B do not allow going further in the comparison between the African and the Spanish forms of Debruijnimys of Late Miocene-Early Pliocene age.
Based on the size, the less elongated shape of this specimen, the presence of low posterior spurs connecting the protocone-hypocone and paracone-metacone pairs and the more accentuated asymmetry in the position of metacone and hypocone in the M1 of Debruijnimys from La Bullana 2B, we distinguish this tooth from D. almenarensis and assign it to a form related with D. julii.
Family Gliridae Muirhead, 1819
Subfamily Dryomyinae de Bruijn, 1967
Genus Eliomys Wagner, 1840
Eliomys intermedius Friant, 1953 (Fig. 6, 8-10)
Material: 4 m1-2 (LB2B-6, LB2B-176, LB2B-242, LB2B243), 1 m3 (LB2B-179), 1 P4 (LB2B-178), 1 M1-2 (LB2B241), 1 M3 (LB2B-177).
m1-2: (1.42 x 1.77; 1.51 x -;-x 1.50; broken specimen): The anterolophid is connected to the protoconid in 1 out of 4 specimens. There is no anterotropid. There is a low connection between metalophid and metaconid. The centrolophid is long and not connected to the metalophid but in one specimen. There is no endolophid. The mesolophid is connected to entoconid. The posterotropids are well developed. Roots are not preserved.
m3: The only available tooth is broken anteriorly. The posterotropid is absent. The centrolophid is shorter than in the m1-2. There is no endolophid. The posterolophid is continuous. Roots are not preserved.
P4: (1.08 x 1.48): Subtriangular outline. There is no anteroloph, and the protoloph is discontinuous. The paracone and metacone are higher than the protocone. There is a well-developed precentroloph and a short postcentroloph. The endoloph is continuous. Roots are not preserved.
M1-2: (1.25 x 1.79): The anteroloph is separated from both protoloph and paracone by a deep valley. There is neither anterotrope nor posterotrope. Paracone and metacone are high and separated from each other. The protoloph and metaloph are continuous. In the only complete specimen the precentroloph is long, and the postcentroloph absent (Fig. 6, 8). The endoloph and posteroloph are connected and continuous. Roots are not preserved.
M3: (1.27 x 1.52): Trapezoidal outline, with the anterior part notably wider than the posterior side. The anteroloph is separated from protoloph, but closer to paracone than in M12. Both anterotrope and posterotrope are absent. The paracone and metacone are high and separated, and attached to a continuous protoloph and metaloph, respectively. Both centrolophs are present and well developed, being the postcentroloph longer and interrupted near its lingual end (Fig. 6, 9). The endoloph and posteroloph are connected and continuous. Roots are not preserved.
[FIGURE 6 OMITTED]
The specimens from La Bullana 2B are larger, more concave and have a more rounded outline than those of Eliomys truci Mein and Michaux 1970 and Eliomys yevesi Mansino, Garcia-Alix, Ruiz-Sanchez and Montoya, 2014. Their size is similar to Eliomys intermedius Friant, 1953 from Sete and Orrios 3 (Adrover, 1986), PUR-13, TCH-3, TCH-1B and TCH-13 (Garcia-Alix et al., 2008b) and Eliomys cf. intermedius from Arquillo 3, Villalba Alta (Adrover, 1986) and Mont Helene (Aguilar et al., 1986). The presence of two centrolophs, being the postcentroloph well-developed (Fig. 6, 9), in the single M3 from La Bullana 2B agree with the species Eliomys intermedins.
Family Sciuridae Fisher, 1817
Subfamily Pteromyinae Brandt, 1855
Genus Atlantoxerns Forsyth Major, 1893
Atlantoxerns sp. (Fig. 6, 1)
Localities: LB2B, LB3
Material: 1 D4 (LB2B-244), 1 m1-2 (LB3-47)
D4: (2.36 x -): Tooth broken posterolabially. Sub-triangular outline. The parastyle is connected to the anteroloph, and separated from the protoloph by a wide and deep valley. The protocone is well developed, very high and connected to the paracone by the protoloph. The metacone is partially broken, and connected to the metaconule by a narrow crest. Both cusps are very close to each other and connected basally to the posteroloph. The metaconule is separated from the hypocone and protocone by a deep valley. Roots are not preserved.
m1-2: Molar broken anteriorly. The posterolophid bears a small hypoconulid, and connects the entoconid to the hypoconid. Roots are not preserved.
Heteroxerus and Atlantoxerns differ mainly in size, but Atlantoxerns has also higher crowns and cusps, more rounded conules and wider crests (Cuenca-Bescos, 1988). The studied specimens are larger than those of Heteroxerus, Atlantoxerns cuencae Aguilar, Calvet and Michaux, 1995, A. martini Aguilar, 2002 and A. idubedensis Cuenca, 1988, They are clearly smaller than those of Atlantoxerns tadlae (Lavocat, 1961), slightly smaller than A. cf. margaritae from La Gloria-2 and Villalba Alta, and slightly larger than the same taxon from Aldehuela (Adrover et al., 1993). The D4 is shorter but wider than that of A. cf. margaritae from Purcal-4 (Garcia-Alix et al, 2007). Atlantoxerns adroveri de Bruijn and Mein, 1968, from Concud 3 (Weerd, 1976), and A. rhodius De Bruijn, Dawson and Mein, 1970 are slightly smaller than our specimens. Due to the scarcity and bad preservation of the recovered specimens we cannot confirm whether the Atlantoxerns from La Bullana 2B is a form related to A. margaritae or to A. adroveri, so we ascribe these molars to Atlantoxerns sp.
Material: 1 m1,2 (LB2B-254).
m1-2: The molar is broken posterolingually. The protoconid is large, and connected to a well-developed anteroconulid. There is a weak anterior cingulid. The crest that connects the protoconid and the hypoconid is slightly swollen, forming a weak mesoconid. Roots are not preserved.
The specimen from La Bullana 2B certainly corresponds to a sciurid, but it is much smaller than the other remains of sciurids found in this locality ascribed to Atlantoxerns. The presence of an anterior cingulid is characteristic of some species of Heteroxerus, although a reduced cingulid may be present in some species of Atlantoxerns, like Atlantoxerns blacki (Cuenca-Bescos, 1988). Therefore, a more precise determination of this tooth is not possible.
Family Cricetidae Fischer, 1817
Subfamily Cricetinae Fischer, 1817
Genus Apocricetus Freudenthal, Mein and Martin-Suarez, 1998
Apocricetus barrierei (Mein and Michaux, 1970)
Localities: LB2B, LB3.
Material, descriptions and Measurements: in Ruiz-Sanchez et al, 2014.
The assemblages from La Bullana 2B and La Bullana 3 have an intermediate size between A. angustidens and A. alberti. The m1 from La Bullana 2B have a crest-like anteroconid, with a weak subdivision, with two anterolophulids arising from a prelophid. In 2 out of 12 specimens there is a third crest pointing backwards from the middle of the anteroconid. The mesolophids are generally absent in m1 and m2. The m3 is generally longer than the m2, having a complete mesolophid in 3 out of 13 specimens. In the m3 from La Bullana 3 the mesolophid is absent.
In La Bullana 2B, the cingulum ridge on the base of the anterocone of M1 is absent (5) or weak (1). Of the seven M1, two have a complete anterior protolophule, one has a weakly developed crest and four have no crest at all. The posterior metalophule is very scarce in M1. 16 out of 20 M2 from La Bullana 2B have an anterior protolophule, whereas the only complete M2 from La Bullana 3 lacks this ridge. 4 out of 17 M2 from La Bullana 2B and 1 out of 3 from La Bullana 3 have a hint of metalophule. In the M3 an anterior protolophule is always present, being complete in 9 out of 13 specimens from La Bullana 2B and in 1 out of 2 from La Bullana 3.
The size of the Apocricetus assemblages from La Bullana 2B and La Bullana 3 agrees with that of A. barrierei (Freudenthal et al., 1998; Ruiz-Sanchez et al., 2014).
The lower molars of A. barrierei from La Bullana 2B and La Bullana 3 differ from those of A. aff. plinii and A. plinii in the weakly split anteroconid in m1, the more pronounced enlargement of m3 and the absence of mesolophids in most m1-2. The prelophid is present in some specimens of A. alberti, but is less developed than in A. barrierei (Mansino et al., 2014).
The M1-2 of A. barrierei from La Bullana 2B and La Bullana 3 differ from those of A. aff. plinii and A. plinii by the bifid anterolophule in the Ml and the absence of mesoloph in the Ml-2. Some specimens of A. alberti and A. barrierei develop a weak cingulum ridge on the base of the anterocone of M1 (Mansino et al., 2014). This ridge is well-developed in A. angustidens.
The anterior protolophule of the upper molars is less developed in A. barrierei from La Bullana 2B and La Bullana 3 than in A. aff. plinii, A. plinii and A. alberti, and higher than in A. angustidens. In addition, the presence of posterior metalophule, complete or hinted, in A. barrierei from La Bullana 2B and La Bullana 3 differs from those of A. angustidens.
Therefore, on the basis of metric and morphological features, the material of the genus Apocricetus from La Bullana 2B and La Bullana 3 may be assigned to A. barrierei.
Subfamily Cricetodontinae Stehlin and Schaub, 1951 Genus Ruscinomys Deperet, 1890 Ruscinomys sp.
Material: 1 M3 (LB2B-175).
M3: (1.80 x 1.54): The dentine is completely lost. This molar has two lobes delimited by the sinus and mesosinus. The posterior lobe is smaller than the anterior one. Roots are not preserved.
Because of its general morphology and hypsodonty, we can ascribe the unique cricetodontine tooth from LB2B to the genus Ruscinomys, although a specific determination is not possible. The only available is an M3, an element which lacks most diagnostic characters. Adrover (1969) noted that the M3 of Ruscinomys lasallei Adrover, 1969, and R. schaubi Villalta and Crusafont Pairo, 1956, are less reduced than those of R. europaeus Deperet, 1890. The M3 from La Bullana 2B differs from the latter species by the presence of two well-developed lobes. However, distinguishing between R. lasallei and R. schaubi is difficult. The size of the M3 from La Bullana 2B is consistent with the lower measurements of R. lasallei and R. schaubi and even with smallest values of R. europaeus. For all these reasons, we ascribe the specimen from La Bullana 2B to Ruscinomys sp.
Order Soricomorpha Gregory, 1910
Family Soricidae Fischer von Waldheim, 1817
Subfamily Soricinae Fischer von Waldheim, 1817
Tribe Nectogalini Anderson, 1879
Genus Asoriculus Kretzoi, 1959
Asoriculus cf. gibberodon (Petenyi, 1864) (Fig. 6, 5-6)
Localities: LB2B, LB3.
Material: 1 m1 (LB2B-245), 1 M1 (LB3-31).
m1: (L: 1.44; TRW: 0.77; TLW: 0.91): The talonid is wider than the trigonid. The hypolophid is well developed and does not reach the entoconid. There is a well-developed oblique crest, which connects the hypoconid with the trigonid. The metaconid is slightly higher than the paraconid. The depression of the trigonid is open and 'V' shaped. The protoconid is broken. The lingual cingulid is low and narrow. The labial cingulid is reduced. Roots are not preserved.
M1: (LL: 1.57; AW: 1.68): The metaloph does not reach the hypocone. There is a well-developed hypoconal flange and a pronounced posterior emargination. The basal connection between the hypocone and posteroloph agrees with the morphotype B described by Reumer (1984). The preprotocrista is in contact with the paracone. The parastyle is short. The paracrista is the shortest crest in the ectoloph. The paramesocrista is longer than the postmesocrista. The metastyle is broken. The metacone is higher than the paracone. The ectoloph is asymmetric. Roots are not preserved.
Asoriculus gibberodon is the smallest species of the genus, and very common in the Pliocene of Europe (Minwer-Barakat et al., 2010; Furio and Angelone, 2010). The presence of a large protoconid and a complete basal cingulid in lower molars are typical features of A. gibberodon (Furio, 2007). The hypocone attached to the posteroloph in the M1 agree with the morphotype B of Reumer (1984). The size of the m1 is consistent with the minimum values of the molars from Villany 3, Csarnota 2, Ostrazmos 1 and 9 (Reumer, 1984), Varshets (Popov, 2003), Fuente Nueva 3 (Furio, 2007), TCH1 and TCH-3 (Minwer-Barakat et al., 2010) and Capo Mannu D1 (Furio and Angelone, 2010). The size of the M1 matches the largest values of the specimens from the mentioned localities. This great biometrical variability is usual in A. gibberodon (Reumer, 1984; Minwer-Barakat et al., 2010).
Figure 4 contains information on the stratigraphical distribution of the rodent faunas described in La Bullana 2B and La Bullana 3, besides other of Spanish localities from MN13 to MN15. The locality of La Bullana 2B contains Apodemus gorafensis, Castillomys gracilis, Paraethomys aff. abaigari, Paraethomys meini, Occitanomys brailloni, Occitanomys sp., Stephanomys dubari, Eliomys intermedius, Apocricetus barrierei, Ruscinomys sp., Atlantoxerus sp., Sciuridae indet., Debruijnimys cf. julii and Asoriculus cf. gibberodon. On the other hand, the locality La Bullana 3 contains Apodemus gorafensis, Paraethomys aff. abaigari, Stephanomys dubari, Apocricetus barrierei, Atlantoxerus sp., and Asoriculus cf. gibberodon. The coexistence of Apodemus gorafensis, Paraethomys meini, Castillomys gracilis and Stephanomys dubari is considered typical of the latest Turolian-earliest Ruscinian (Garcia-Alix et al, 2008a). The size and morphology of Stephanomys present in La Bullana 2B and La Bullana 3, with some specimens close to S. cordii, are similar to the molars from the lower Ruscinian (MN14) sites of PUR-4, PUR7 and PUR-13 (Garcia-Alix et al., 2008a).
Other species of biostratigraphic relevance in La Bullana 2B are Occitanomys brailloni and Paraethomys aff. abaigari. Occitanomys brailloni appears in MN14, extending its range to MN16 (Weerd, 1979; Ruiz Bustos et al., 1984; Castillo, 1990; Minwer-Barakat, 2005). Paraethomys aff. abaigari is found together with the smaller P. meini in some localities of the MN14, like PUR-13, CLC-5A, Celadas-14, Celadas-5, Celadas-5A, La Gloria 4 and Celadas 9 (Garcia-Alix et al, 2008c). In older localities, closer to the MN13-MN14 boundary like PUR-4, P. meini shows a wide size range, which may indicate that the lineage of P. abaigari is already present in those assemblages, and in Peralejos E two specimens are close to P. aff. abaigari (Garcia-Alix et al, 2008a).
Regarding the cricetids, the presence of Apocricetus barrierei in La Bullana 2B and La Bullana 3 clearly indicates a lower Ruscinian age for these localities (Freudenthal et al, 1998; Garcia-Alix et al., 2008b).
In La Bullana 2B, glirids are represented by Eliomys intermedius. This species appears in MN14 (Sese, 2006), being La Gloria 4 in the Teruel basin (Mein et al., 1990), and PUR-13 in the Granada Basin (Garcia-Alix et al., 2008b), the oldest records of this taxon. The faunal assemblage of La Bullana 2B indicates a similar age for the three localities (see Fig. 4).
Debruijnimys julii was described in the middle Pliocene (MN15) locality of Asta Regia (Castillo and Agusti, 1996), where Stephanomys donnezani, Paraethomys jaegeri and Paraethomys cf. meini are also present. This assemblage is clearly younger than that from LB2B.
Debruijnimys sp. has been cited in the lower Ruscinian sites of Gorafe 1, La Gloria 4, Alcoy 4B and Caravaca (Minwer-Barakat et al., 2009b). Gorafe 1, from the latest MN14 is included by Minwer-Barakat et al. (2012) in the Trilophomys Assemblage Zone of the Guadix basin, characterized by the association of Apocricetus barrierei, Stephanomys cordii, Castillomys gracilis, Apodemus gorafensis, Paraethomys meini and Trilophomys.
With respect to La Gloria 4, this locality belongs to the Promimomys and Paraethomys Assemblage Zone of the Teruel basin, within the MN14, where two species of Paraethomys, P. meini and P abaigari, coexist (Mein et al, 1990). The presence of Stephanomys dubari, two Paraethomys species and Apocricetus barrierei suggest a similar age for La Gloria 4 and La Bullana 2B and La Bullana 3 (Fig. 4). In Caravaca, the presence of S. dubari, Apocricetus barrierei, Castillomys gracilis and a big-sized Apodemus indicate a similar age to that of La Bullana 2B and La Bullana 3 (Freudenthal et al., 1998; Bruijn et al., 1975; Weerd, 1976; Aguilar et al., 1991).
According to these observations, Debruijnimys sp. from Gorafe 1 and Alcoy 4B are younger than the form present in La Bullana 2B, and Debruijnimys sp. from Caravaca and La Gloria 4 may be of a similar age. The sites where D. almenarensis is present, Negratin-1 and Almenara M, correspond to the Late Turolian and are clearly older than La Bullana 2B and La Bullana 3.
A preliminary paleomagnetic study was carried out in the localities La Bullana 2B and La Bullana 3. We collected five samples to produce a preliminary paleomagnetic study around La Bullana sites, which are stratigraphically above the classical site of Venta del Moro, dated at 6.23 Ma (Gibert et al, 2013). The samples from La Bullana 3 show normal polarity, like the two lower samples from La Bullana 2B, while the two upper samples from this locality show reverse or ambiguous polarities, indicating a normal-reverse polarity sequence (Fig. 2). The presence of a basal normal zone, the differences with Venta del Moro fauna and the similarities with sites located in the latest Miocene or earliest Pliocene suggest that the identified normal zone should be correlated with chron C3n.4n in the earliest Pliocene, dated between 5.235 Ma and 4.997 Ma (Lourens et al, 2005). Therefore, the fauna of La Bullana 3 can be constrained to the age of this chron and the site La Bullana 2B, placed a few meters above its upper boundary, should be constrained between the age of this boundary (4.997 Ma) and the next magnetic reversal at 4.896 Ma.
The analysis of micromammal assemblages has been widely used as a paleoclimatic indicator (Weerd, 1976; Daams et al., 1988; Casanovas-Vilar and Agusti, 2007; Garcia-Alix et al., 2008; Furio et al., 2011).
Some authors have proposed a minimum sample size of at least 100 specimens when dealing with fossil assemblages (Daams et al., 1999; Garcia-Alix et al., 2008d), while others used a minimum of 50 specimens (Casanovas-Vilar and Agusti, 2007), arguing that in most cases larger samples only add one or two species to the assemblage, with an abundance of less than 1 %. According to this, the sample from La Bullana 3 is too scarce to carry out any paleoecologic inference, having yielded just 32 specimens. For this reason we only present here the data from La Bullana 2B.
To interpret the paleoecologic requirements of each taxon found in La Bullana 2B, we have used mainly the climatic and habitat preferences proposed by Garcia Alix et al. (2008d). According to that work, a number of taxa are considered as warm weather indicators (Apodemus gorafensis, Paraethomys meini, Apocricetus, Atlantoxerus and Asoriculus gibberodon), whereas Ruscinomys, of which a single element has been found, indicates cold conditions. Regarding the humidity, the presence of P meini, Ruscinomys and Atlantoxerus has been associated with dry conditions, while A. gorafensis, Eliomys intermedins and A. gibberodon would indicate a wet environment. The presence of Apocricetns, Rnscinomys and Atlantoxerus indicates open habitats, whereas Eliomys intermedius and Asoriculus gibberodon would suggest the presence of forested zones in the area (Garcia-Alix et al., 2008d). However, Freudenthal et al., (2014) point out that the genus Eliomys cannot be considered a humid environment indicator based on the ecological affinities of extant E. quercinus, which is a habitat generalist, and the distribution of E. munbyanus and E. melanurus, restricted to semidesert environments. Therefore, we consider E. intermedius, probable ancestor of E. quercinus (Garcia-Alix et al., 2008b), and eurytopic taxon regarding both habitat and humidity. The presence of the gerbilid Debmijnimys suggests a dry and arid environment (Minwer-Barakat et al., 2009b), and the affinities of P. aff. abaigari, Occitanomys brailloni and Occitanomys sp. are unknown (Garcia-Alix et al., 2008d).
The proportions of the taxa within each ecological category are shown in table 6. Regarding the humidity, most of the taxa recorded in La Bullana 2B are eurytopic (55.52 %) or with unknown affinities (P. aff. abaigari and Occitanomys brailloni and sp. 21.89 %). Because of that, the relative proportion of humid (10.66 %) and dry (11.93 %) environment indicators does not seem very representative. However, most of the taxa studied in this work are considered as typical to warm environments (57.87 %), and the abundance of Apocricetus together with Ruscinomys and Atlantoxerus and the presence of Debmijnimys suggest an open environment (36.78 % of the assemblage). Therefore, we consider that the faunas from La Bullana 2B indicate warm conditions and probably an open environment with some patches of vegetation.
5.4. Considerations on the "gerbil event " in Europe according to the presence of Debmijnimys in La Bullana 2B
The Messinian Salinity Crisis (MSC) is the main event in the evolution of the Mediterranean during the Neogene. The beginning of the MSC took place about 5.96 Ma ago, with the closure of the Betic and Rifian seaways, which connected the Atlantic and Mediterranean domains. The Mediterranean was reflooded at the base of the Pliocene after the opening of a new seaway, the Gibraltar strait (Hsu et al., 1973). The effects of this event on the faunal exchanges between Africa and Europe during this time interval have been widely discussed in the literature, and several authors have accepted the creation of new migration routes for terrestrial organisms (Brandy and Jaeger, 1980; Agusti and Casanovas-Vilar, 2003; Aguirre, 2003; Made et al., 2006; Agusti et al., 2006; Minwer-Barakat et al, 2009b; Gibert et al., 2013, among others).
One of the taxa of African origin that colonised the Iberian Peninsula during the MSC is the gerbil Debmijnimys. Until now, only two species of this genus have been recorded in Europe, D. almenarensis, identified in some MN13 localities, and D. julii, only known from the type locality, Asta Regia (MN15).
The origin of D. almenarensis and D. julii has been discussed in several papers (Castillo and Agusti, 1996; Agusti and Casanovas-Vilar, 2003; Minwer-Barakat et al., 2009b), which has important paleobiogeographic implications. While D. almenarensis (MN13) has a clear African origin, related to the MSC Event, the origin of D. julii (MN15) is more difficult to establish. Thus, the dispersion processes which explain the presence of gerbils in Western Europe have proven to be very complicated. According to Agusti and Casanovas-Vilar (2003), there are, at least, two different waves of gerbil colonisation from northern Africa recorded in the Iberian basins. The first wave, of Late Turolian age (Late Miocene), involved D. almenarensis, whereas the second one corresponds to the representatives of Debruijnimys (Debruijnimys sp.) found in the Lower Pliocene (lower Ruscinian, MN14) localities of Alcoy, Gorafe, Caravaca and La Gloria 4. The presence of A. barrierei in Botardo, Alcoy 4B, Caravaca, La Gloria 4 (Freudenthal et al., 1998) and La Bullana 2B, confirm an Early Pliocene age (early Ruscinian, MN14) for these localities. La Bullana 2B is older than Alcoy 4B, probably slightly older than La Gloria 4 and similar in age to Caravaca and Botardo.
If D. julii is not the direct descendant of D. almenarensis, the presence of D. julii in the MN15 implies, necessarily, a second migration event from Africa to Europe in the span interval between MN13 and MN15 (Agusti and CasanovasVilar, 2003). Thus, according to Agusti and Casanovas-Vilar (2003), Debruijnimys sp. from the lower Ruscinian localities of Alcoy, Gorafe, Caravaca and La Gloria 4 (MN14) would be the descendant of D. davidi, and the ancestor of D. julii, known from the Late Ruscinian (MN15) site of Asta Regia 3.
However, there is a great similarity between D. almenarensis and the subsequent forms of Debruijnimys (see Fig. 5), and a direct ancestor-descendant relationship cannot be discarded. Still, if the presence of D. julii in MN14 is confirmed, it would expand the range of this taxon, until now recorded only in MN15. This would make the phylogeny of Debruijnimys even more complex, since the relationship between Debruijnimys sp. from MN14 and D. julii is not clear, and they may even be the same species. Another option would be a process of cladogenetic speciation along the Early Pliocene, resulting in two different lineages of Debruijnimys, and unnamed species and D. julii, but the relationship between this latter species and the forms present in MN14 is not clear, and they may be indeed the same taxon.
Nevertheless, any hypothesis on the phylogenetic relationships of Debruijnimys is difficult to test because of the scarce material of Debruijnimys sp. from the early Pliocene of the Iberian Peninsula. Only Alcoy 4B yielded a rich sample, but nowadays it is a lost locality. Therefore, until new material from Ruscinian sites becomes available, little more can be said in this regard.
The new data from La Bullana 2B contribute to improve the knowledge on the status of this lineage of African rodents in the Iberian Peninsula after the colonisation processes during the Messinian Salinity Crisis, but open new questions around the evolution of this group, too.
The faunal list of La Bullana 3 comprises Apodemus gorafensis, Paraethomys aff. abaigari, Stephanomys dubari, Apocricetus barrierei, Sciuridae indet. and Asoriculus cf. gibberodon. In addition to these taxa, La Bullana 2B has yielded remains of Castillomys gracilis, Occitanomys brailloni, Occitanomys sp., Paraethomys meini, Ruscinomys sp., Eliomys intermedius, Debruijnimys cf. julii and Atlantoxerus sp. Based on these faunal assemblages, we propose a lower Ruscinian age (MN14) for both localities.
The preliminary paleomagnetic analysis indicates an earliest Pliocene age for La Bullana 3 and La Bullana 2B. The age of La Bullana 3 lies probably within the C3n.4n chron, dated between 5.235 Ma and 4.997 Ma. The age of La Bullana 2B should be constrained between the top of this chron (4.997 Ma) and the next magnetic reversal at 4.896 Ma.
The presence of Eliomys intermedius in La Bullana 2B constitutes one of the oldest records of this taxon, probably equivalent to la Gloria 4 and PUR-13. The presence in La Bullana 2B of Apodemus gorafensis, Paraethomys meini, Apocricetus barrierei, Atlantoxerus and Asoriculus cf. gibberodon suggest warm conditions, and the relative abundance of Apocricetus, Ruscinomys and Atlantoxerus is consistent with an open environment.
The Early Ruscinian locality of LB2B constitutes the first record of a form related to Debruijnimys julii in MN14. However, the scarcity of the available material of Debruijnimys from Early Pliocene sites prevents any proper analysis, and its phylogenetic relationships remain controversial.
The campaigns of prospection and excavation in the area of Venta del Moro have been funded by the Conselleria de Cultura y Esports of the Valencian government since 1995. We thank the efficient work of the technicians of the SCSIE of the UV, P. Gomez, E. Navarro and A.J. Ibanez. This investigation was carried out thanks to the Prometeo Project of the Secretariat for Higher Education, Science, Technology and Innovation from Ecuador. We thank Dr. Jordi Agusti for his comments. We thank the Paleomagnetic Laboratory CCiTUB-ICTJA CSIC where the paleomagnetic measurements were conducted and the Ramon y Cajal program of the Spanish Goverment for its help. This investigation has been funded through the project GV06/304 of the Conselleria d'Empresa, Universitat i Ciencia "Estudio paleoambiental del transito Mioceno-Plioceno en facies continentales en la Comunidad Valenciana (Cuencas del Cabriel y de Alcoy)". This investigation was supported by projects CGL2011-25754 and CGL2011-28681 of the Spanish Ministry of Economy and Competitiveness.
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S. Mansino (1) *, FJ. Ruiz-Sanchez (1,2,3), L. de Luque (4), P. Montoya (1), L. Gibert (5), J. Morales (6), J. Abella (2,6), V.D. Crespo (1), G.R. Scott (7)
(1) Departament de Geologia, Area de Paleontologia, Universitat de Valencia, Doctor Moliner 50, 46100 Burjassot, Spain.
(2) Universidad Estatal Peninsula de Santa Elena, Edificio INCYT, Km 1.5 Avenida Principal Santa Elena, 240210 La Libertad, Ecuador.
(3) L'Hort de Feliu, P. O. Box 8460, Alginet, Valencia, 46018, Spain.
(4) Fundacion Conjunto Paleontologico Teruel-Dinopolis, Edificio Dinopolis. Avda Sagunto s/n, Teruel 44002, Spain.
(5) Departament de Geoquimica, Petrologia i Prospeccio Geologica, Universitat de Barcelona, C/Marti i Franques s/n, 08028 Barcelona, Spain.
(6) Institut Catala de Paleontologia Miquel Crusafont, Universitat Autonoma de Barcelona, Edifici ICTA-ICP, Carrer de les Columnes s/n, Campus de la UAB, Cerdanyola del Valles, 08193 Barcelona, Spain.
(7) Berkeley Geochronology Center, 2455 Ridge Road Berkeley, California 94709, USA.
e-mail addresses: firstname.lastname@example.org (S.M.; *corresponding author), email@example.com (FJ.R-S.), firstname.lastname@example.org (L.L.), email@example.com (P.M.), firstname.lastname@example.org (L.G.), email@example.com (J.M), firstname.lastname@example.org (J.A), email@example.com (V.D.C.), firstname.lastname@example.org (G.S.)
Received: 1 August 2014 / Accepted: 1 June 2015 / Available online: 20 July 2015
Table 1.--Measurements in millimeters of the teeth of Apodemus gorafensis from the localities La Bullana 2B and La Bullana 3. n= number of measurable specimens. Element Locality Parameter n min. mean max. ml LB2B L 4 2.05 2.08 2.14 W 4 1.26 1.31 1.35 m2 LB2B L 5 1.49 1.54 1.57 W 5 1.27 1.36 1.41 LB3 L 4 1.49 1.52 1.58 W 4 1.37 1.42 1.48 m3 LB2B L 5 1.12 1.17 1.21 W 5 1.03 1.08 1.12 LB3 L l - 1.22 - W l - 1.08 - M1 LB2B L l - 2.22 - W 3 1.40 1.46 1.50 LB3 L 2 - 1.57 - M2 LB2B L 3 1.53 1.57 1.63 W 3 1.37 1.42 1.45 LB3 L l - 1.70 - W l - 1.50 - M3 LB2B L 3 1.00 1.05 1.12 W 3 0.94 1.02 1.08 LB3 L l - 0.97 - W l - 1.01 - Table 2.--Measurements in millimeters of the teeth of Castillomys gracilis from the locality La Bullana 2B. n= number of measurable specimens. Element Locality Parameter n min. mean max. ml LB2B L 5 1.35 1.40 1.47 W 5 0.88 0.90 0.93 m2 LB2B L 4 1.02 1.06 1.12 W 4 0.93 0.95 0.98 M1 LB2B L 6 1.44 1.52 1.61 W 6 1.01 1.05 1.12 M2 LB2B W 1 - 1.21 - M3 LB2B L 1 - 0.76 - W 1 - 0.69 - Table 3.--Measurements in millimeters of the teeth of Occitanomys brailloni from the locality La Bullana 2B. n= number of measurable specimens. Element Locality Parameter n min. mean max. m1 LB2B L 3 1.84 1.87 1.90 W 4 1.25 1.28 1.31 m2 LB2B L 2 1.45 1.50 1.55 W 2 1.39 1.40 1.40 m3 LB2B L 5 1.05 1.09 1.15 W 5 0.97 1.02 1.06 M1 LB2B L 3 1.96 2.05 2.11 W 3 1.42 1.46 1.49 M2 LB2B L 1 - 1.48 - W 1 - 1.40 - Table 4.--Measurements in millimeters of the teeth of Paraethomys aff. abaigari and P. meini from the localities La Bullana 2B and La Bullana 3. n= number of measurable specimens. Element Species Locality Parameter n min. mean max. ml P. aff LB2B L 1 - 2.36 - abaigari W 3 1.49 1.52 1.57 P. aff LB3 L 1 - 2.36 - abaigari W 1 - 1.54 - P. meini LB2B L 8 2.12 2.18 2.26 W 9 1.38 1.43 1.46 m2 P. aff LB2B L 7 1.65 1.71 1.76 abaigari W 9 1.45 1.53 1.62 P. aff LB3 L 3 1.66 1.71 1.76 abaigari W 3 1.51 1.53 1.58 P. meini LB2B L 2 1.37 1.40 1.42 W 2 1.25 1.32 1.39 m3 P. aff LB2B L 7 1.43 1.47 1.51 abaigari i W 7 1.25 1.31 1.37 P. meini LB2B L 5 1.29 1.31 1.35 W 6 1.15 1.20 1.28 M1 P. aff LB2B L 4 2.53 2.56 2.61 abaigari W 4 1.67 1.70 1.74 P. meini LB2B W 1 - 1.50 - M2 P. aff LB2B L 5 1.79 1.87 1.96 abaigari W 6 1.60 1.67 1.73 P. meini LB2B L 1 - 1.56 - W 2 1.47 1.48 1.49 M3 P. aff LB2B L 4 1.23 1.29 1.38 abaigari W 4 1.23 1.27 1.34 P. meini LB2B L 1 - 1.16 - W 1 - 1.18 - Table 5.--Measurements in millimeters of the teeth of Stephanomys dubari from the localities La Bullana 2B and La Bullana 3. n=number of measurable specimens. Element Locality Parameter n min. mean max. ml LB2B L 5 2.07 2.16 2.27 W 5 1.29 1.31 1.44 m2 LB2B L 5 1.51 1.62 1.70 W 5 1.46 1.51 1.58 m3 LB2B L 3 1.25 1.31 1.37 W 3 1.21 1.24 1.28 M1 LB2B L 4 2.30 2.46 2.69 W 4 1.58 1.74 1.83 M2 LB2B L 3 1.58 1.74 1.88 W 3 1.70 1.73 1.76 LB3 L l - 1.72 - W l - 1.63 - M3 LB2B L 2 1.15 1.25 1.36 W 2 1.13 1.22 1.31 Table 6.--Paleoecological affinities of the taxa from the studied localities. The relative abundance (RA) of each taxon is calculated following Martin-Suarez (1988), dividing the number of specimens (N) by the number of diagnostic elements (DE) of each group. Abbreviations: C, cold; DE, diagnostic elements; D, dry; E, eurytopic; F, forested; H, humid; N, number of specimens; O, open; RA, relative abundance; U, unknown; W, warm. N DE N/DE RA Apodemus gorafensis 26 12 2.17 10.43 Castillomys gracilis 17 12 1.42 6.81 Occitanomys brailloni 17 12 1.42 6.81 Occitanomys sp. 1 12 0.08 0.40 Paraethomys aff. Abaigari 36 12 3.00 14.43 Paraethomys meini 27 12 2.25 10.82 Stephanomys dubari 25 12 2.08 10.02 Apocricetus barrierei 89 12 7.42 35.68 Ruscinomys sp. 1 12 0.08 0.40 Debmijnimys cf. julii 1 12 0.63 3.01 Eliomys intermedius 10 16 0.08 0.40 Atlantoxerus sp. 1 16 0.06 0.30 Sciuridae indet. 1 16 0.05 0.24 Asoriculus cf. gibberodon 1 20 0.05 0.24 TOTALS Temperature Humidity Apodemus gorafensis W H Castillomys gracilis E E Occitanomys brailloni U U Occitanomys sp. U U Paraethomys aff. Abaigari U U Paraethomys meini W D Stephanomys dubari E E Apocricetus barrierei W E Ruscinomys sp. C D Debmijnimys cf. julii U D Eliomys intermedius E E Atlantoxerus sp. W D Sciuridae indet. U U Asoriculus cf. gibberodon W H TOTALS Warm: 57.87 % Humid:10.66 % Cold: 0.40 % Dry: 11.93 % Eurytopic: 19.84 % Eurytopic: 55.52 % Unknown: 21.89 % Unknown: 21.89 % Habitat Apodemus gorafensis E Castillomys gracilis E Occitanomys brailloni U Occitanomys sp. U Paraethomys aff. Abaigari U Paraethomys meini E Stephanomys dubari E Apocricetus barrierei O Ruscinomys sp. O Debmijnimys cf. julii U Eliomys intermedius E Atlantoxerus sp. O Sciuridae indet. U Asoriculus cf. gibberodon F TOTALS Open: 36.78 % Forested: 0.25 % Eurytopic: 41.09 % Unknown: 21.88 %
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|Title Annotation:||texto en ingles|
|Author:||Mansino, S.; Ruiz-Sanchez, F.J.; de Luque, L.; Montoya, P.; Gibert, L.; Morales, J.; Abella, J.; Cre|
|Publication:||Journal of Iberian Geology|
|Date:||Jul 1, 2015|
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