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

Sample text

Four species of described from Lhe Pierre Shale: Solenoceras sp. BHI specimen 7 em long (Stephenson, 1 94 1 ) has been recorded from the Baculites compressus and Baculires reesidei Zones of northern Colorado. The Solenoceras found asso­ ciated with Didynwceras nebrascense, Didymocems stevensoni, and E�itelocerasjenneyi are, at the time of lhis wriling. not published. The species found with Didymoceras nebrascense is pictured here as Solenoceras sp. 1 em long Left: So/enoceras sp. • Solenoceras crassum (W h tif ei ld .

FA�liL"r -� ' B'\( lJI I I II >AI Baculites sp. (smooth) Baculites sp. (weak flank ribs) Bacullles sp. 3 em long Baculites sp. (weak flank ribs) USNM 23639 18 em long This species is the first (oldc l) ofthc baculitcs Directly above the Baculites sp. (smooth), in a Range Zone fossil. Specimens the Gammon Ferruginous Member of the Pierre 10 be used a have an ovate cro s section and a low degree of Shale and equivalent for- taper. They are generally quite smooth on the mations, is the unnamed llanks, hence, the infor- baculite, mal name.

3 em across Mancos Shale in Moffat County, Colorado. Regarding this specie , W. A. Cobban (written communication. ,rrowth stages. S pecirnens from the Gammon Ferruginous Member of the Pierre Shale ( Scaphites hippocrepis Ill) begin with a minute planispiral coil ( irnilar to that of Baculites) followed by loose elliptical to circular whorls. Specimens from north Texac;. about the age of the Raculites obtusus Zone, begin as a small helix followed by loose circular whorls. Specimens from France (possibly about the age of Baculires mcleami or Baculires asperifonnis Zone) begin as a minute coil (like that of Baculites) followed by a straight, smooth shaft, then a narrow helix, and fmally the loa e, circular to elliptical.

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