Two Paciphacops Trilobites - Black Cat Mountain, Oklahoma

This is a pair of partially enrolled Paciphacops campbelli from the famous Black Cat Mountain quarry near Clarita, Oklahoma.

It has amazing surface detail including the many eye facets preserved in each eye. It was prepared under microscope using air abrasives.

There is a second very similar species found in the same layers called Kainops. The most easily identifiable, distinguishing feature is the number of eye facets. Kainops has substantially more eye facets than Paciphacops does. Paciphacops seams to be the scarcer of these two phacopids, but that might depend on the specific layer being collected.

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.
Paciphacops campbelli
Black Cat Mountain, Clarita, Oklahoma
Haragan Formation
Larger 1.2" long (if outstretched)
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