4.9" Polished Calcite "Egg" With Fossils In Cross Section - Madagascar

Polished Calcite Egg With Fossils In Cross Section - Madagascar #88726

This is a polished "egg" containing many fossils in cross section, likely shell fish. The empty spaces have been filled in with Calcite crystals. I believe these came from a formation which is Late Jurassic in age.

It comes with the pictured 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.

More about ammonites