Geology of Loudoun County

The geology of Loudoun County, Virginia, was mapped in 1988 through 1991 under a cooperative agreement between the U.S. Geological Survey (USGS) and the Loudoun...1988年至1991年间，在美国地质调查局（U.S. Geological Survey, USGS）与劳登……之间的合作协议框架下，弗吉尼亚州劳登县的地质填图工作得以完成。