A preserved river landscape from the time before Antarctica was icebound persists more than a mile below the East Antarctic Ice Sheet
An ancient river system from the era when the bottom of the world was ice-free is buried more than a mile deep below the East Antarctic Ice Sheet.
“This is an indication that it really was rather quick,” Larter says. “We didn’t have hundreds of thousands or millions of years of this intermediate state where you had wet-based ice flowing.” The mapping revealed three separate blocks of a highland that are each between about 2,700 and 3,860 square miles in size, which at the upper end is slightly smaller than the state of Connecticut. The blocks are separated by two fjords up to 25 miles wide. The fjords plunge 4,856 feet and 2,034 feet, respectively, below the global mean sea level.
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