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 10. Coal-correlation diagram A-A\022, showing coal beds in the Wyodak coal interval. Datum is elevation (ft) above sea level; no horizontal scale. Note variations in thickness in the Main Wyodak coal bed and in number of partings. This Main Wyodak interval is shown in detail in Figure 11. See Figure 3 for the location of Line A-A\022. R, Rider Wyodak; M, Main Wyodak; L, Lower Wyodak coal beds; Local, unnamed coal bed of limited areal extent. 
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U.S. Geological Survey Open-File Report 97-469