Arnioceras semicostatoides (Spath).
Nice small piece of 'Goldstone' rock. So called because the Ammonites are preserved in golden pyrite. This bed is rarely exposed so examples are few and far between.Both surfaces show beautifully preserved Ammonites. 3 complete specimens with numerous partials and negatives.
Jurassic, Upper Sinemurian, Obtusum Zone.
Black Ven, Charmouth / Lyme Regis, Dorset.
Specimen : 6 x 4.2 cm.
