Information obtained from exploratory drilling of potential coal-gasification sites in the Powder River Basin of Wyoming and Montana is summarized. The objectives were to obtain stratigraphic descriptions of the coal-bearing strata from cuttings and geophysical logs, determine the hydrologic characteristics of the coal and associated strata, and see if there were drilling and logging problems associated with deep, thick coal seams. It was decided to do preliminary hydrologic and gasification experiments on the shallower Felix coal before proceeding to more deeply buried coals. The types of information obtained included geophysical borehole logs, lithologic and stratigraphic logs derived from drill cutting samples, drilling rate data, stratigraphic columns showing the depth and thickness of the coal and associated strata, log analyses showing lithology, computer-generated average porosity, density and velocity, composition diagrams of the geophysical logs run and the lithologic correlations picked from the logs, and coal analysis from selected Felix Coal cores. Specific results are reported in numerous tables, graphs and survey charts.