Promicroceras planicosta (Sowerby) with Xipheroceras dudressieri d'Orbigny.
'Tombstone' block of grey limestone. Lying in a line on one surface are a group of 6 beautifully preserved calcitic Ammonites. These would have come to rest in a channel on the seabed. With negative impressions and a Bivalve. Makes for a beautiful display / shelf specimen.
Jurassic, Upper Sinemurian, Obtusum Zone.
Black Ven, Charmouth / Lyme Regis, Dorset.
Matrix : 17.5 x 17 x 3.5 cm.
