Arnioceras semicostatoides Spath.
Small piece of the 'Goldstone' Bed from Black Ven. The Ammonites from this thin bed are highly distinctive as is the matrix. One surface shows several specimens.
Jurassic, Upper Sinemurian, Obtusum Zone.,'Goldstone Bed'.
Black Ven, Charmouth, Dorset.
Specimen : 6 x 5.5 x 1.5 cm.
