This coal seam is named for its outcrop high on the sheer north face of Mount Washington in Pittsburgh, Pennsylvania,[4] and it is considered to form the base of the upper coal measures of the Allegheny Plateau,[5] now known as the Monongahela Group.[6] The first reference to the Pittsburgh coal bed, named by H.D. Rodgers of the First Geological Survey of Pennsylvania,[7] was on a 1751 map.[8]
^Susan J. Tewalt, Leslie F. Ruppert, Linda J. Bragg, Richard W. Carlton, David K. Brezinski, Rachel N. Wallack, and David T. Butler, 2000. Chapter C - A Digital Resource Model of the Upper Pennsylvanian Pittsburgh Coal Bed, Monongahela Group, Northern Appalachian Basin Coal Region. U.S. Geological Survey Professional Paper 1625–C, 106 p. http://pubs.usgs.gov/pp/p1625c/CHAPTER_C/CHAPTER_C.pdf
^White, I.C., 1898, The Pittsburgh coal bed: American Geologist, v. 21, p. 49–60
^Eavenson, H.N., 1938, The Pittsburgh coal bed; its early history and development: American Institute of Mining and Metallurgical Engineers Transactions, v. 130, p. 1–55
^C. M. Young, Percentage of Extraction on of Bituminous Coal with Special Reference to Illinois Conditions, Engineering Experiment Station Bulletin No. 100, University of Illinois, June 1917, page 90.
^Geology and Mining Activities, Mine Drainage Pollution Abatement Project, Commonwealth of Pennsylvania Department of Environmental Resources, no date, see Figs 1 and 8.