‘Squiggly wiggly’ fossils rise from a Jurassic sea

The quantities involved are astonishing. Not hundreds, not thousands, but perhaps tens of thousands of these animals that scientists collectively call “the echinoderms”. It’s a great name, derived from the Greek for “hedgehog”, or “spiny”, “skin”. What is a sea urchin, if not an “underwater hedgehog”?

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