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Tags: Alligator, Alligator Lizzard, Atrypae, Central Missouri Devonian, Devonian, evolution, Function, geological evolution, Geology, history, Mississippi River, Missorui, natural History, Pleistocene, pre-cambrian, structure, structure of Missouri, theory
Tags: Atrypa, Atrypae, Biology, brachiopod, Central Missouri, Fossil, genus, Missouri, Paleontology, shell, shells
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