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Dinosaur coastal highway.

Dinosaur coastal highway

If you think about all the cars traveling along Route 101, which skirts the West Coast from Washington through southern California, it hardly seems strange that dinosaurs may have had their own version of the coastal highway. Ichnologists, who study footprints, are beginning to piece together a dinosaur "freeway" they believe might have run for hundreds of kilometers along the coast of the ancient sea that filled the interior of North America during the Cretaceous period.

Martin G. Lockley and Mark W. Jones at the University of Colorado in Denver focused on a certain section of sedimentary rocks called the Dakota group, which formed the coastal plain for that inland sea approximately 140 million years ago. Outcrops of the Dakota group appear sporadically along the front range of the Colorado Rockies, and are filled with fossilized tracks from iguanodontids and other dinosaurs. The researchers also finding signs that the tracks continue into New Mexico. These extensive tracks indicate dinosaurs roamed along the seashores, and are probably the firmest evidence yet that dinosaurs migrated up and down the coast, Lockley says.
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Title Annotation:tracks indicate dinosaurs migrated along seashores
Author:Monastersky, Richard
Publication:Science News
Date:Nov 19, 1988
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