Oldest Large Body of Ancient Seawater Identified under Chesapeake Bay

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USGS scientists have determined that high-salinity groundwater found more than 1,000 meters (0.6 mi.) deep under the Chesapeake Bay is actually remnant water from the Early Cretaceous North Atlantic Sea and is probably 100-145 million years old. This is the oldest sizeable body of seawater to be identified worldwide.

 

http://www.usgs.gov/newsroom/article.asp?ID=3725&from=rss