.64" Ammonite (Promicroceras) Fossil - Lyme Regis

This is a very beautiful Promicroceras planicosta ammonite fossil which has been replaced with a golden calcite, collected from the Lyme Regis region of England. It's almost translucent and has been nicely prepared so that it displays very well on the limestone slab. One edge of the rock has been cut flat, allowing for aesthetic presentation without the need for a display stand.

Ammonites were predatory mollusks that resembled a squid with a shell. These cephalopods had eyes, tentacles, and spiral shells. They are more closely related to a living octopus, though the shells resemble that of a nautilus. True ammonites appeared in the fossil record about 240 million years ago. The last lineages disappeared 65 million years ago at the end of the Cretaceous.

Promicroceras planicosta
Lyme Regis, Dorset, England
Lower Lias, Obtusum Zone
Ammonite .64" wide, Rock 3.9 x 2.6"
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