Ammonite

Additional images

Whitby connection

This ammonite, called Harpoceras, is very common in the thick, black shales near Whitby on the Yorkshire coast. Yet here it is, in a completely different rock type from the Dorset coast. As ammonites evolved quickly through time, this species only lived for a short time. Therefore we know that the black shales at Whitby and the Junction Bed (Beacon Limestone Formation) near Seatown are exactly the same age, even though the rocks look completely different. The second photo is of the same ammonite but from Yorkshire.

Find out more about ammonites on the molluscs pages.

Common name

Ammonite

Scientific name

Harpoceras elegans

Type

Molluscs > Cephalopods


Strata

Upper Lias, falciferum zone, earatum subzone

Time period

Lower Jurassic

Age

c. 201-174 million years

Where found

unknown

Found by

unknown

Museum

Bridport Museum

Accession number

BRPMG 1103