An unusual dated example of stratified flood sediment 0.8 to 1.0 m thick deposited by the Shenandoah and Potomac rivers suggests that individual layers may represent very short time intervals, perhaps measured in hours or even minutes. Well over one hundred distinct strata ranging from less than 0.1 mm to 3 mm in thickness occur over Civil War rubble. It is believed only 2 or 3 floods over a total period of no more than 12 days were high enough to have contributed to the sedimentary deposit.

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