Diabase outcrops (plutonic equivalent of basalt) provided shelter for Union, attacking Confederacy had to march over eroded soft sediments http://pic.twitter.com/e4hNBHk6E2
— David Bressan (@David_Bressan) July 1, 2017
via Twitter https://twitter.com/David_Bressan
July 01, 2017 at 04:14PM
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