4.3" Jurassic Ammonite (Hildoceras) Fossil - England

This is a large, 4.3" wide Hildoceras ammonite from Whitby, England. It was found within a large concretion which was broken open to reveal the fossil. The bottom edge of the concretion has been cut flat, allowing for the specimen to stand up nicely on a flat surface.

Ammonites were predatory cephalopod mollusks that resembled squids with spiral shells. They are more closely related to living octopuses, though their shells resemble that of nautilus species. True ammonites appeared in the fossil record about 240 million years ago during the Triassic Period. The last lineages disappeared 65 million years ago at the end of the Cretaceous.

What an ammonite would have looked like while alive.
What an ammonite would have looked like while alive.


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DETAILS
SPECIES
Hildoceras
LOCATION
Port Mulgrave, Whitby, North Yorkshire, England
FORMATION
Upper Lias, Bifrons Zone
SIZE
4.3" wide on 6.5 x 6.3 x 3.4" rock
ITEM
#176347
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