Lower Cambrian Harkless Formation

Esmeralda County, Nevada

The darker-colored object on rock slab is one of the oldest true corals in the geologic record, called scientifically Harklessia yuenglingensis (class Anthozoa, subclass Zoantharia--probably a tabulate coral); from the lower Cambrian Harkless Formation, Great Basin Desert, Nevada. Photograph courtesy Melissa Hicks.

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