Two Fossil Ammonites (Promicroceras) - Lyme Regis

These are two very beautiful agatized, Promicroceras planicosta ammonite fossils, collected from Lyme Regis, England. They have been nicely prepared so that they display very well on the limestone slab. One edge of the rock has been cut flat, allowing for aesthetic presentation of the specimen 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.

What an ammonite would have looked like while alive.
What an ammonite would have looked like while alive.
Promicroceras planicosta
Lyme Regis, Dorset, England
Lower Lias, Obtusum Zone
.61" largest ammonite, 5.6 x 3.6" rock
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