2.4" Cretaceous Ammonite (Desmoceras) Fossil - Madagascar

Here is a small, agate replaced ammonite fossil of the species Desmoceras latidorsatum, collected from Madagascar. Some of the exterior shell has been polished away, exposing the beautiful suture pattern beneath. The remaining shell exhibits excellent iridescence.

Ammonites were predatory mollusks that resembled squids with shells. These cephalopods had eyes, tentacles, and spiral shells. Though their shells resemble that of a nautilus, they are actually more closely related to living octopuses. Ammonites appeared in the fossil record about 240 million years ago, barely surviving several major extinction events. The last lineages disappeared 65 million years ago at the end of the Cretaceous.

Artist's reconstruction of an ammonite,  by Nobu Tamura
Artist's reconstruction of an ammonite, by Nobu Tamura
Desmoceras latidorsatum
Mahajanga Province, Madagascar
2.4" wide
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