Lower Ordovician Al Rose Formation Formation

Inyo County, California

Here are several stipes from a Tetragraptus sp. graptolite, collected from the Al Rose Formation, Inyo County, California. Note the sawtooth-like structures on the graptolite rhabdosome at left; each of those sawtooth compartments is called a theca, inside of which the colonial graptolite animal lived.

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