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Lower Mississippian dendroid graptolites of Missouri.

Understanding the paleoclimate of the Rheic Ocean at the beginning of the Mississippian Period, throughout the Kinderhookian, will help determine the spatial and temporal limits of the dendroid Graptolite Dictyonema within Missouri. The paleoclimate is understood through the interpretation of the lithology of the Kinderhookian, specifically the Chouteau group limestones and shales. Current geologic map data from the DNR and previous literature on the Chouteau and Graptolites in Missouri forms the foundation from which the author built the structure of this research. Hundreds of hours of field work tracked down Dictyonema blairi Gurley (flabelliform morphology) and D. shelbini Lewis n. sp. (infundibuliform morphology) throughout the upper Chouteau group of late Kinderhookian. Dictyo-nema seems to have lived throughout the Upper Chouteau and was deposited in the following Fm(s) after death in atleast the Northview of Southwestern Missouri, the Sedalia of Central Missouri, the Chouteau undifferentiated and possibly the McCraney Ls of Northeastern Missouri. Random sampling of the above formations indicated that certain zones within them were more likely to contain Dictyonema. The silty limey mudstones or limestones of the Undifferentiated Chouteau/ McCraney seem to contain more whole Graptolites, which may represent the environment from which the Graptolites lived. According to the data collected, Graptolites lived intermittently within the shallow benthos of the epeiric sea of North America.

* Lewis, D. Independent Amateur Paleontologist.
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Title Annotation:Geology and Geophysics, Senior Division
Publication:Transactions of the Missouri Academy of Science
Article Type:Abstract
Geographic Code:1U4MO
Date:Jan 1, 2005
Words:222
Previous Article:Sedimentary manganese and iron mineralization in the St. Francois mountains magmatic-hydrothermal iron district; Southeast Missouri.
Next Article:Precambrian stromatolites replaced with epidote in a prebatholithic sequence of Reynolds County, Missouri.
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