10.2" Jurassic, Cut & Polished Ammonite (Half) - Madagascar

This is a stunning, 10.2" 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 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 ago and they barely survived several major extinction events. The last lineages disappeared 65 million years ago at the end of the Cretaceous.

Artists reconstruction of an ammonite.  By Nobu Tamura
Artists reconstruction of an ammonite. By Nobu Tamura
DETAILS
SPECIES
Unidentified
LOCATION
Sakaraha, Tulear Province, Madagascar
SIZE
10.2" wide
ITEM
#182921
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