ICYMI, metaoceanic rocks in the Mid-Atlantic Piedmont tell of the switch in river drainage direction over time: https://t.co/mytZqL2JjP http://pic.twitter.com/FLSpVPjB7G
— Callan Bentley (@callanbentley) January 28, 2017
via Twitter https://twitter.com/callanbentley
January 28, 2017 at 10:00PM
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