In productive marine environments, a square meter (10. 8 square feet) of seafloor can be perforated by hundreds to thousands of isolated and interconnected tunnels through which crawl and writhe a cornucopia of clams, shrimp, sea stars, sand dollars, snails, worms and other animals.

Source: [Phys.org](https://phys.org/news/2026-08-twenty-years-fossils-reveal-blurs.html)

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