Lithologic and geophysical logs and coal analyses from test holes drilled during 1977 in Converse and Campbell counties, Wyoming

Abstract

Between August 11 and November 16, 1977, 28 coal test holes were drilled in Converse and Campbell Counties, Wyoming (figure 1). This drilling was done as part of an ongoing US Geological Survey program to evaluate and classify mineral lands in the public domain. The overall purpose of the program is to gather data on the thickness, quality, extent, correlation, and recoverability of coal beds, and the thickness and lithologic characteristics of the associated rocks in the Tertiary Fort Union and Wasatch Formations of the Powder River Basin. This report presents geophysical logs and lithologic descriptions, lagged or corrected in depth intervals to match the geophysical logs of each test hole, and analyses of coal samples obtained from three offset core holes. Similar information from 343 test holes and approximately 149 coal samples from 53 core tests in Campbell and Converse Counties, Wyoming, was presented in earlier reports (US Geological Survey and Montana Bureau of Mines and Geology, 1973, 1974, 1976a, 1976b, 1977, 1978; Kistner, 1977). Figure 1 shows the locations and test-hole numbers of all holes drilled during the 1977 field season. 8 references, 1 figure, 5 tables.