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Matching trilobite fossil pair split open showing positive and negative impressions in stone

How a Tiny Shell Split a 430-Million-Year-Old Trilobite

Over 430 million years ago, a trilobite died on an ancient seafloor — and a drifting brachiopod shell sealed its fate in a most unexpected way. When paleontologists finally split the stone, they discovered not just a stunning fossil, but a prehistoric accident frozen in rock: a tiny shell that had wedged itself between head and body, quietly prying the creature apart across deep time.

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