Water, water, everywhere and some of it’s been undisturbed for more than 100 million years.
Groundwater collected from sediments at the mouth of the Chesapeake Bay is thought to be 100 to 145 million years old. The ancient samples, twice as salty as modern seawater, were already trapped in sediments when an asteroid or comet landed in the area some 35 million years ago, researchers report in the Nov. 14 Nature.
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