1905. 2011-05-31T14:11:43Z. 2015-10-21T15:00:05Z. Geological Survey (U.S.). The Survey. English. Public. Culpeper County (Va.), Fauquier County (Va.), Luray Region (Va.), Madison County (Va.), Page County (Va.), Rappahannock County (Va.), Shenandoah County (Va.), Virginia, and Warren County (Va.).
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1912. 2011-05-31T17:26:12Z. 2015-10-21T15:00:06Z. Geological Survey (U.S.). The Survey. English. Public. Page County (Va.), Rockingham County (Va.), Shenandoah County (Va.), Virginia, West Virginia, and Woodstock Region (Shenandoah County, Va.).
1891. 2011-05-19T19:36:53Z. 2011-05-19T19:42:43Z. U.S. Geological Survey. English. Public. West Virginia, Berkeley County (W. Va.), Hampshire County (W. Va.), Morgan County (W. Va.), Virginia, Frederick County (Va.), Clarke County (Va.), Warren County (Va.), and Shenandoah County (Va.).