Orthoceras appeared 500 million years ago becoming extinct during the Devonian period 385 million years ago. The name means straight horn, referring to the characteristic of long, straight, conical shell. The preserved shell is all that remains of this ancestor of our modern day squid. Found fossilizing in marine rock, especially lime stones. This one was discovered in the atlas mountain range of southern Morocco. They have been discovered up to 14 feet long.
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