February 2, 2018

Ammonites and the Other Cephalopods of the Pierre Seaway: - download pdf or read online

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

ISBN-10: 0945005253

ISBN-13: 9780945005254

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

Sample text

1 877) Solenoceras crassumfollows t he descrip tio no fthe genus . 5 em inlength. Itbeg i ns w tih a n ammon itell a, anopen pl an si p ri al co il,a bro adly curved l mb, i two parallel,t ghtly i joined adult s baft c; joined by a t ghtly i co lied ,a cute elbow, and rurs ri ad ai te r bb i i ng onthe b ody ch a mber . E ach r b i bears at uber cle on either side o ft he ve nter. O ccurren ces n i th e P er i re Se aw ay are fr om the Didymoceras stevensonithrough the Exitelocerasjenneyi Ra nge Z ones from S outh Dakot a.

However, most varietic did not pos es thi form of ornamentation. The family occur worldwide in the Upper Cretaceous from the Turonian through the Maastrichtian. Genus Exiteloceras Hyarr. s = hom Thi genu is de. cribed a having too e. ellipticaJ, planispiral coiling and a subcompressed to oval- haped whorl section. Rib are simple in the early tage , becoming more complex with branching and intercaJation in later tages. Nearly all of the ribs that eros the flanks and venter have tubercle and pines.

Didymoceras cochleatum occurs in the Baculires gregoryensis Range Zone in central South Dakota and i n the Annona Chalk of Howard County, Arkansas. Oidymoceras cochleatum BHI · 4019 8 x 13 em Didymoceras mortoni ( Hall and Meek, 1854) Didymoceras mortoni differs from itc; contemporary Didymoceras tortum by its irregular positioning of tubercle on the ribs on the ventrolateral flank and by wider, stronger, straighter. and more distinct ribs on the flanks and venter. Initial coils are similar to Didymoceras tortum, but the whorls taper less or do not expand as rapidly as on Didynwceras tortum.

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Ammonites and the Other Cephalopods of the Pierre Seaway: Identification Guide (Fossils & Dinosaurs) by Neil L. Larson, Steven D. Jorgensen, R. A. Farrar, Peter L. Larson


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