Ammonite: Arnioceras semicostatum

Photograph of ammounite: Arnioceras semicostatum View larger image
Specimen id: 90 When found: Sunday, March 1, 1959
Where found: From block on shore, Flat Scars, Robin Hood’s Bay, North Yorkshire.
Geological Horizon:

Lower Jurassic
Lower Sinemurian Stage
Redcar Mudstone Formation
Arnioceras semicostatum Zone
Grid Reference: NZ965033 [Map]
Source Collection: The Robinson Ammonite Collection