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

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. Ammonites appeared in the fossil record about 240 million years. The last lineages disappeared 65 million years ago at the end of the Cretaceous.

Unidentified Ammonites & Calcite
4.9" tall, 3.7" wide, over 3 lbs