UCMP MYSTERY FOSSIL #41 is . . .
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The helicoplacoids are one of the oldest groups of echinoderms to appear in the fossil record. Shaped something like a fat cigar, they are thought to have lived upright, either in burrows or with a portion of their bodies partly buried in the substrate. Complete fossils of helicoplacoids have been found only in the White Mountains of California. Find out more about helicoplacoids here. |
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