Ammonites and the other cephalopods of the Pierre Seaway: identification guide
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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Maps of the Pierre Shale
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ammonitella ammonites Baculites compressus Baculites cuneatus Baculites gregoryensis Baculites obtusus Baculites perplexus Baculites reesidei Baculites scotti Baculites sp Bearpaw Shale Black Hills Institute body chamber broad Campanian cephalopods cm long Baculites Cobban coiled Colorado compressed cross section Baculites curved degree of taper Didymoceras Didymoceras cheyennense Didymoceras nebrascense Didymoceras stevensoni Eutrephoceras Family flank ribs Formation fossils genus Geological Survey Professional gladius Hoploscaphites Inoceramus involute Journal of Paleontology Larson Late Cretaceous Maastrichtian macroconch Meek and Hayden Menuites Mexico Montana North America Nostoceras ovate cross section Oxybeloceras Pachydiscus pattern cross section phragmocone Pierre Seaway Pierre Shale planispiral Ponteixites Range Zone Reeside Rhaeboceras rounded row of tubercles Scaphites Scaphites hippocrepis shell diameter siphuncle slightly Solenoceras South Dakota species specimens Survey Professional Paper suture pattern cross taper Moderate Trachyscaphites tubercles U.S. Geological Survey umbilical shoulder umbilical walls umbilicus Upper Cretaceous USGS USNM venter Ventral view ventrolateral tubercles Western Interior whorl section Wyoming