Ammonite: Arnioceras semicostatum

Photograph of ammounite: Arnioceras semicostatum View larger image
Specimen id: 24 When found: Thursday, December 1, 1955
Where found: From block on shore, Flat Scars, Robin Hood’s Bay, North Yorkshire.
Geological Horizon:

Lower Jurassic
Sinemurian Stage
Redcar Mudstone Formation
Arnioceras semicostatum Zone
Grid Reference: NZ965033 [Map]
Notes:

No collection date given, only month and year. 1st day of month recorded for purposes of database storage.
Source Collection: The Robinson Ammonite Collection