Ammonites and the other cephalopods of the Pierre Seaway: identification guide

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Geoscience Press, 1997 - Nature - 148 pages
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Ammonites are extinct marine animals related to present day squid, octopi, and chambered nautilus. Contains descriptions of more than 90 species that lived for 12 million years in the Pierre Seaway, which extended through the interior of North America, connecting the Arctic Ocean with the Gulf of Mexico.

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Contents

Geologic Setting
2
Maps of the Pierre Shale
8
Order Ammonoidea
18
Copyright

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