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Assume Horn Coral?
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first appeared in the geologic record during the Ordovician Period, which began 488 million years ago; the Rugosa persisted through the Permian Period, which ended 251 million years ago. .............So youngest it could be 251 MILLION years old to oldest 488 million years old. Either way its a tad older than Hal, lol sorry bud couldn't resist. Super cool find. Oldest thing I have is a Meg tooth range from 23-3.6 M years old.
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