Ammonites and the Other Cephalopods of the Pierre Seaway: by Neil L. Larson, Steven D. Jorgensen, R. A. Farrar, Peter L.

By Neil L. Larson, Steven D. Jorgensen, R. A. Farrar, Peter L. Larson

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Extra resources for Ammonites and the Other Cephalopods of the Pierre Seaway: Identification Guide (Fossils & Dinosaurs)

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43 �- FA\IILY DESl\IOCERATIDAE ZITIEL. - The Family Desmoceratidae is defined by thick, round nanks and planispiral coiling. The whorls are general Iy round, oval, or even spear-shaped (having pronounced keels). The flanks are generally smooth to weakly ribbed with occasional constrictions. The family occurs world\;Vide from the Lower Cretaceous through the Upper Cretaceous. Genus Parapuzosia Nowak, para = near+ pu;;osia 1913 The genus commonly attains a size greater than 60 em. The umbilicus is moderately involute, and the umbilical walls are steep and high.

Scribed, but has not yet been published. This un­ published species oc­ c u r s throughout the Western Interior along with Baculites scotti BHI 4168 1 6 cm long (new species) BHI 4671 2 em by 5 em long BHI 4168 cross section Baculites scorri Baculites sp. � <;eetions � (9 Cobban 1958a 26 . Baculites sp. Bacutltes scant suture pattern Baculites scotti AmmonirPS and tire orlrer Ceplraloporu of the Pierre Seawcry (new species) BHI specimen cross section Baculites sp. FA�lll ' fil\< l l ll l i >AI "•.

Pseudo­ baculites has been found in rocksofLateConiacian Age in Wyoming. Utah, and Colorado, and late Campanian rocks of Wyoming and Saskatchewan. Pseudobaculites natosini (Robinson, 1 945) This species has perhap· the largest body cham­ ber of any other species within the Family Baculitidae, yet with its rapid taper i l never achieves a long i7e. Pseudobaculires Jzawsini has been described from the Bacu/itesjenseni Zone of the Lewis Shale in central Wyoming. the Baculites eliasi Zone of the Pierre Shale in east cemral Wyoming, the Beacpaw Shale in Mon­ tana.

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