Coal availability in the Hilight quadrangle, Powder River Basin, Wyoming: a prototype study in a western coal field
by Carol L. Molnia, Laura R. H. Biewick, Dorsey Blake, Susan J. Tewalt, M. Devereux Carter (US Geological Survey), and Charlie Gaskill (Bureau of Land Management)
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Figure 4. Generalized composite stratigraphic section for the Hilight quadrangle. Thicknesses are averages, in feet. Non-coal rocks are siltstones, claystones, shales, and sandstones. (After IntraSearch, 1979.) 
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U.S. Geological Survey Open-File Report 97-469