Structure contour interval 10 feet. Key bed: fire clay coal.
"Oil production curves for the Martha and the Oil Springs pools."
"U.S.G.S. base in part."
Includes text, 1 structural cross section, 1 general section, index map to surveys, and chart "Production curve for Martha and Oil Springs Districts."
Covers parts of Floyd, Johnson, Magoffin, Morgan, Lawrence and Elliott counties, Kentucky, located between Sandy Hook and Prestonburg.