3.8" Jurassic Ammonite (Asteroceras) Fossil - Dorset, England

This is a beautifully preserved, 3.8" wide Asteroceras obtusum ammonite fossil from the Lyme Regis region of England. One half of the ammonite has been prepped free from the rock. The outer shell has been prepped away from much of the ammonite, revealing the gorgeous, leaf-like suture pattern beneath. The base of the rock has been cut flat for presentation purposes.

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.
Asteroceras obtusum
Black Ven, Charmouth, Lyme Regis, Dorset, England
Lower Lias, Obtusum Zone
Ammonite 3.8" wide. Entire specimen 11.7 x 8.6"
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