CANNONBALL MARINE MEMBER OF LANCE FORMATION 531 



Ft. In. 



Shale, brown 3 o 



Lignite 4 2 



Shale 13 o 



Lignite 3 8 



Shale and sandstone 15 o 



Lignite, poor 3 4 



Shale, carbonaceous 6 



Shale 



255 6 



Section on West Side of Little Missouri River, Sec. 10, Tp. 135 N., 

 R. 105 W., North Dakota^ 



Ft. In 



Fort Union Formation 



Sandstone, light 15 2 



Ludlow lignitic member of Lance formation 



Shale, dark 24 o 



Limestone, arenaceous 2 10 



Shale, blue 7 2 



Sandstone, gray, friable 4 o 



Shale, gray 3 7 



Sandstone, argillaceous i 4 



Shale, drab, hard i 2 



Lignite 4 5 



Shale, dark, hard 2 10 



Shale, light, fossils, leaves 2 10. 



Lignite 2 6 



Shale, carbonaceous i 8 



Sandstone 2 8 



Shale I 8 



Sandstone and shale, alternately 2 8 



Lignite i o 



Sandstone and shale 3 o 



Lignite 6 



Sandstone 4 o 



Lignite i 7 



Sandstone, white, hard 3 o 



Sandstone in upper part, shale in lower part; Ostrea glabra 

 above base (only representative found of Cannonball 



marine member) 2>2> 1 1 



'See footnote, p. 533. 



