Sea Urchin Spine
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Taxon: Phylum Echinodermata, Class Echinoidea
Locality: Pacific Beach, San Diego County, CA
Age: Pliocene
Rock unit: San Diego Formation
Collector: W. Itano
This is an isolated spine of a sea urchin (echinoid).
I am unable to classify it more specifically.
It is 2.3 cm long.
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