Pseudolioceras lythense Ammonite fossil - Whitby, North Yorkshire, Yorkshire Fossils on the Jurassic Coast

Ammonite fossil for sale found near Whitby, North Yorkshire on the Jurassic Coast 

 
Pseudolioceras lythense (Young & Bird, 1828)

Compressed (flattened) discus shaped ammonite, with vertical or undercut umbilical walls (bottom edge of the whorl).  Narrow top (venter) to the whorl, which has a strong sharp keel.  The ribs perform sinuous curves and usually the body chamber is crushed.

Age (lithology): Upper Lias; Toarcian; Bifrons zone; Commune and Fibulatum subzones.

 Actual ammonite size: 7.8cm 

Distribution: Port Mulgrave, Kettleness, Sandsend, Hawsker, Ravenscar.

Occurrence:  Relatively common