Pair of Fossilised Ammonites

$442.35

A pair of impressive ammonites, embedded in a stone matrix. The ammonites display beautiful and complimentary shades of brown, and the shell walls – known as septa – are well preserved and visible. The back of the stone is rough and plain.

Date: Circa 150 million years old
Period: Jurassic - Cretaceous Period
Condition: Very fine condition

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SKU: AF-67 Category: Tags: , ,

Ammonites are part of the cephalopod family, along with Nautiloids and Coleoids (which include squid and octopuses). Although Ammonites look similar to Nautiloids, both species inhabit a coiled shell, they are actually believed to be more closely related to Coleoids. Ammonites were born with one tiny shell and built new chambers as they grew. They would have moved into the new chamber, sealing off the older, smaller chambers, these chambers were also filled with gas, allowing the ammonite to control its buoyancy.

Ammonites first appeared around 450 million years ago, during the Paleozoic Era, and became extinct around 66 million years ago, at the end of the Cretaceous period. Ammonites became extinct at the same time as the dinosaurs, in a mass extinction believed to have been caused by an asteroid collision.

Weight 11950 g
Dimensions L 30 x W 29.5 x H 10 cm
Time Period

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