A coal resource investigation of the five coal fields of western Maryland was undertaken by the U.S. Geological Survey, Reston, Virginia, beginning November 1979. The objective was to determine the coal resources of Maryland (exclusive of lignite). Data used in the report were partly obtained from previously published maps and literature that were based primarily on site-specific information from two U.S. Bureau of Mines drilling projects during the late 1940s, surface mining permits, underground mine documents, water well logs, coal company drilling records, and unpublished field notes. Structure contour maps were prepared as a basis for correlation of the coal beds. Coal bed maps that were prepared at a scale of 1:24,000 showed areas of surface and underground mining. The extent of surface mining was based partly on aerial photography taken in May 1979. Mined-out underground areas were determined from previously

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