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Fossil Shells Swap Spiral Direction Over Millennia — An ancient fossil shell displaying reversed spiral growth patterns found in sedimentary rock layers. / BRICKFEED STUDIO

An ancient fossil shell displaying reversed spiral growth patterns found in sedimentary rock layers. / BRICKFEED STUDIO

SCIENCE

Fossil Shells Swap Spiral Direction Over Millennia

Ancient marine shells periodically reverse their spiral growth direction in geological records.

By the Science Desk · Sep 11, 12:00 PM

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