1. Geologic map of the Broad Bottom quadrangle, eastern Kentucky [cartographic material] Yale Public content 1965. 2011-12-19T19:16:05Z. 2012-03-05T17:26:13Z. Alvord, Donald C. (Donald Clayton), 1922-. U.S. Geological Survey. English. Public. Kentucky, Pike County, Floyd County, and U.S.