Partial Trimerus Trilobite Preserved On Side - New York

This is a partial specimen of an uncommon Trimerus delphinocephalus trilobite from the Rochester Shale of New York. It's preserved on it's side and compressed. It could have been a 3-4" trilobite if complete. It can be seen from both sides of the rock.

Trilobites were a very diverse group of extinct marine arthropods. They first appeared in the fossil record in the Early Cambrian (521 million years ago) and went extinct during the Permian mass extinction (250 million years ago). They were one of the most successful of the early animals on our planet: over 25,000 species have been described, filling nearly every evolutionary niche. Due in large part to their hard exoskeletons (shells), they left an excellent fossil record.

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