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15 million-year-old whale skull found on banks of Potomac River
From the banks of the Potomac River, in a region steeped in American history, a massive fossil was dug up last month that apparently can be traced back to a time long before this country's recorded history, a time deep in the world's prehistory.
By Martin Weil and and Maggie Fazeli Fard, The Washington Post
August 5, 2013