Orthoceras and ammonite fossil Plate Black, White, and Grey
Orthoceras and ammonite fossil Plate Black, White, and Grey
Orthoceras and ammonite fossil Plate Black, White, and Grey
Orthoceras and ammonite fossil Plate Black, White, and Grey

Orthoceras and ammonite fossil Plate Black, White, and Grey

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The long cone shaped one in the middle is an Arthoceras.
The two Nautilus shaped ones on the sides are Ammonites.

Orthoceras were marine animals that lived somewhere between 200 and 400 million years ago. They are an ancestor to the squid. A mass extinction event happened at some point and many of them died in a shallow water area that is now Morroco. Orthoceras Not only swam but they also crawled along the ocean floor. Their shells fell to the ocean floor when they died. After years of sediment covering them they fossilized into stone.

In order to swim Orthoceras would fill their chambers, (septas)with air, then squirt it out to propel themselves through the water, like a jet!


Ammonites closely resemble modern squids, octopus and the chambered nautilus. Ammonites were carnivores. They live around the same time as Orthoceras. Some are even older than the dinosaurs! they were a predator in the oceans.

This specimen measures approximately 12" x 12" at the widest parts.