Large-scale cross beds in ash of 79AD eruption of Vesuvius, backfilling a cavity (room) at Herculaneum. It came in the front door. http://pic.twitter.com/vPs8rpjw9H
— Callan Bentley (@callanbentley) July 2, 2017
via Twitter https://twitter.com/callanbentley
July 02, 2017 at 11:24AM
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