Franziceras graylockense Taylor 1998 (ammonite)

Cephalopoda - Ammonitida - Psiloceratidae

Full reference: D. G. Taylor. 1998. Late Hettangian-early Sinemurian (Jurassic) ammonite biochronology of the western Cordillera, United States. Geobios 31:467-497

Belongs to Franziceras according to L. M. Longridge et al. 2008

See also Taylor 1998 and Taylor and Guex 2002

Sister taxa: Franziceras coronoides, Franziceras kennecottense, Franziceras ruidum, Franziceras sunrisense

Type specimen: NWMNH 25025, a shell. Its type locality is Graylock section, P. morganense assemblage, which is in an Angulata marine limestone in the Graylock Formation of Oregon.

Ecology: fast-moving nektonic carnivore

Average measurements (in mm): shell diameter 25.2


• Jurassic of Canada (6: British Columbia collections), United States (2: Oregon)

Total: 8 collections each including a single occurrence

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Specimen images are retrieved through the ePANDDA API.

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