Twenty years and 7,500 fossils reveal what blurs Earth's marine fossil record

Phys.org reports on a twenty-year effort involving seven thousand five hundred fossils that reveals what blurs Earth's marine fossil record. In productive marine environments, the report notes, a single square meter of seafloor can be perforated by hundreds to thousands of tunnels through which burrowing animals like clams, shrimp, sea stars, sand dollars, snails, and worms crawl and writhe.

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