10" Crystal Filled, Cut & Polished Ammonite (Half) - Madagascar

This is a stunning, 10" wide, orange colored ammonite fossil which has been cut in half and polished to reveal the inner chamber detail. It was collected near Sakaraha in the Tulear Province of Madagascar and is Late Jurassic in age, or approximately 160 million years old.

Many of the living chambers remained hollow during fossilization and became lined with orange colored quartz crystals in a similar process to how geodes form. There are quite few species/genus of Phylloceratid family but there are several similar genus and species found in the area.

As with nearly all of the larger ammonites there is some repair work as they are naturally fractured while in the ground and need to be stabilized during the collection and preparation process. One half of the ammonite is included along with a display stand.

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
Sakaraha, Tulear Province, Madagascar
10" wide
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