FOSSIL AMMONITES #6

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AMMONITES: Xipheroceras dudressieri and Asteroceras margaritoides.

From the Lower Lias (Sinemurian Stage, Jurassic Period) of the Dorset coast, South-West England. This tightly packed assemblage of ammonites was found in a lenticular mudstone concretion on the foreshore below Black Ven at Lyme Regis. It is likely a 'top stone' from just below the Stellare nodule bed.

The large Xipheroceras (upper left) measures just over 2" (5 cm) across. This specimen was found and prepared by Mark.