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17,500-year-old shells from a clam found in North Atlantic seafloor sediment.

Climate Chowder

17,500-year-old shells from a clam found in North Atlantic seafloor sediment helped WHOI geologist Lloyd Keigwin learn about ocean circulation and climate changes. Clams and other shelled organisms incorporate the chemical characteristics of the deep-ocean water that existed when their shells and skeletons formed. (Photo by Lloyd Keigwin, Woods Hole Oceanographic Institution)

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