Ancient seawater found in Chesapeake Bay impact crater

The oldest seawater discovered to date — up to 145 million years old — has been found in deep sediments below the Chesapeake Bay impact crater. The highly saline water, a remnant from the ancient North Atlantic Ocean, was likely preserved when a 3-kilometer-wide bolide impacted the Delmarva Peninsula 35 million years ago, altering the region’s underlying structural geology, reported U.S. Geological Survey hydrologist Ward Sanford and colleagues in Nature.

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Sara E. Pratt

Sara E. Pratt

Pratt, EARTH's senior editor, is based in Boulder, Colo. She is a graduate of the earth and environmental science journalism dual master’s program at Columbia University and Lamont-Doherty Earth Observatory and has written for Discover, Oceanus, Geotimes, NOVA and NOVA ScienceNow, and worked in scientific publishing and educational outreach. Email: sepratt@earthmagazine.org. Twitter: @GeoScienceSara.

Saturday, July 19, 2014 - 02:00