530 E. RUSSELL LLOYD AND C. J. HARES 



Partial Composite Section, Tp. 20 N., R. 9 E., Black Hills Meridian, 



South Dakota 



Ft. In. 



Ludlow lignitic number of the Lance formation 



Sandstone, yellow, medium fine-grained, capping hills . . . , 20 o 



Shale, brown 3 o 



Lignite i o 



Shale, brown 6 



Sandstone, yellow 16 o 



Shale, brown i 10 



Lignite, dirty 8 



Shale, brown '. 3 o 



Shale, black 8 



Lignite, dirty ; 6 



Shale, brown i 6 



Sandstone, buff to yellow 12 o 



Shale, brown 2 o 



Shale, black 4 



Lignite, fair 8 



Sandstone and shale, with lignite streaks 13 6 



Lignite, fair 8 



Shale 3 



Lignite, good 3 6 



Shale, brown, arenaceous i o 



Sandstone 



82 7 



Composite Section in Tp. 21 N., R. 7 E., Black Hills Meridian, 



South Dakota 



Ft. In. 



Fort Union formation 



Sandstone and shale 138 o 



Ludlow lignitic member of the Lance formation 



Shale, chocolate-colored 2 o 



Sandstone, buff, yellow, fine-grained, alternating with buff 



shale 9 o 



Shale, chocolate-colored 3 4 



Lignite i o 



Shale, buff and yellow sandstone, alternating 16 o 



Shale, chocolate-colored 3 o 



Sandstone, brown, fine-grained 2 6 



Shale 10 o 



Lignite, Gianniatti bed 11 8 



Sandstone, light, argillaceous 16 4 



