CANNON BALL MARINE MEMBER OF LANCE FORMATION 529 



Composite Section in Secs. 32 and 36, Tp. 22 N., R. 5 E., Black Hills 

 Meridian, South Dakota 



Ft. In. 



Fort Union formation 



Sandstone, yellowish, and shale 255 o 



Ludlow lignitic member of the Lance formation 



Lignite 8 



Sandstone, somewhat shaly 45 o 



Shale, dark 2 o 



Lignite 2 4 



Sandstone, light colored, grayish, argillaceous 12 o 



Sandstone, buff, with ferruginous specks 15 o 



Lignite 2 



Sandstone, buff, fine-grained, muscovitic 11 o 



Liginite 3 



Sandstone 8 o 



Lignite 6 



Sandstone, buff 25 o 



Shale, bluish i o 



Shale, carbonaceous 10 



Shale, arenaceous 5 o 



Lignite i 



Sandstone, buff, soft S 4 



Sandstone i ' o 



Shale, arenaceous with carbonaceous streaks 4 o 



Sandstone, argillaceous 6 o 



Lignite i o 



Concealed interval 22 o 



Sandstone, drab, cross-bedded, ripple-marked 3 o. 



Shale, arenaceous 4 o 



Lignite i 5 



Shale, brown 3 o 



Lignite 2 i 



Shale, dark 5 



Lignite 8 



Shale I 3 



Lignite i 5 



. Shale, brown 4 o 



Lignite 2 3 



446 8 



