By Neil L. Larson, Steven D. Jorgensen, R. A. Farrar, Peter L. Larson
Read Online or Download Ammonites and the Other Cephalopods of the Pierre Seaway: Identification Guide (Fossils & Dinosaurs) PDF
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Extra info for Ammonites and the Other Cephalopods of the Pierre Seaway: Identification Guide (Fossils & Dinosaurs)
About two per shell diameter low degree of taper Moderate Baculltes sp. (weak flank ribs) Rolm to ovate cross section Mlnor to well-ribbed venter Broad arcuate ribs or swellings on flanks, about one per sheU diameter Moderate 0 ' J Bacu/ites sp. (smooth species) Ovate cross sectJon Minor nobong on venter Smooth flanks Siogtll degree of taper Moderate 41 · ;r FAMILY COLLIGNONICERATIDAE W RIGtiT:,-·AND The Family Collignoniceratidae i s characterized b y compressed oval to nearly square whorled forms of planispiral ammonites with a generally evolute umbilicus.
Specimens are found Colorado, and New Mexico, Springs Member and lower part in the upper part of the Sharon in South Dakota, Wyoming, of the Mitten Member in Wyo as well as in the Claggeu ming, South Dakota, and Colo Shale in Montana. rado, and i n the Claggett Shale in Montana. >> seccion 22 Ammonites and tire other Ct'plralopods ofthe Pierrf' Seaway 35 cm long Baculites mrleami sumre pattern vl� Recside 1927 USGS 06372 Cobban 1962b cro>s section Baculites asperiformis Meek. 187 6 Baculites sp.
Gh to low degree of taper Moderate to large Baculites corrugatus Elias. 1933 Compressed CfOSS section Prorrunent ventral ribs,five to seven per shell diameter Smooth flanks Slight degree of taper Moderate to large 8 )) Bacu/ites rugosus Cobban, 1962a Compressed cross sec1ton Strong ventral bs, n three to four per shell diameter Smooth to weakly ribbed flanks Htgh to low degree of taper Moderate to large 39 15,,, L 1 ITr I r" N 1 1 t I< ,, l iON G UlllL 'J Typical suture pattern Bscu/ites crlckmayi Williams, 1930 Ovate cross secti0/1 Smooth to well-ribbed venter Sculpted flanks with broad undulations.