Orthoceras Necklace on Cord

Type - Orthoceras Polished

Era - Ordovician

Age - 430 million years ago

Location - High Atlas Mountains, South Morocco

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Orthoceras Fossils: The Ancient Straight-Shelled Cephalopods

When we think of fossilized sea creatures, we often picture coiled ammonites, but before those elegant spirals ruled the oceans, there were the straight-shelled Orthoceras.

These ancient marine animals lived roughly 450 to 200 million years ago, thriving through the Ordovician to Triassic periods. Orthoceras belonged to the broader cephalopod family, the same group that includes modern squids, octopuses and the living nautilus.

In fact, they’re early members of the nautiloid lineage, distant ancestors of ammonites and represent one of the earliest forms of complex marine life with a true internal structure designed for movement and buoyancy control.

Learn more about Orthoceras here - Orthoceras Fossils: The Ancient Straight-Shelled Cephalopods