Ammonite (Asteroceras & Promicroceras) Fossils - England

This is a pair of beautiful, golden calcite replaced ammonite fossils (Asteroceras confusum & Promicroceras planicosta) from the Lyme Regis region of England. They have been nicely prepared from the hard limestone they were found in. The base of the rock has been cut flat so that it stands up nicely without the need for a display stand.

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 confusum & Promicroceras planicosta
Black Ven, Charmouth, Lyme Regis, Dorset, England
Obtusum Zone
1.45" & 1.1" wide, Rock 5.5x4.1"
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