Arnioceras semicostatoides Spath.
'Goldstone' refers to a very thin particular horizon in the cliffs at Black Ven where the Ammonites have a golden colour. This is a piece of the original find from back in the 1980's.One surface is covered in beautifully preserved positives and negatives of Arnoiceras. The reverse has more of the same. The keel of a very large Arnioceras is exposed along one edge. 'Goldstone 'specimens of this quality rarely come up for sale anymore.
Jurassic, Upper Sinemurian, Obtsum Zone.
Black Ven, Charmouth / Lyme Regis, Dorset.
Specimen :8 x 6.5 cm
