CANNONBALL MARINE MEMBER OF LANCE FORMATION 535 



Ft. In. 



5. Sandstone and shale, light colored, thin-bedded, the shale 

 containing indeterminable vegetable remains 30 o 



6. Sandstone, consolidated i 6 



7. Shale, light blue i 6 



8. Sandstone and shale, alternating 15 o 



9. Shale, dark, carbonaceous i o 



10. Sandstone and shale, alternating, base concealed by 



talus at base of slope 5+ 



129 6+ 



No. 4 and the overlying beds of this section are undoubtedly 

 of marine origin; the lowest beds may be non-marine but no definite 

 line could be drawn. 



Section of Part of Cannonball Marine Member in South Bluffs of 

 Cannonball River, E. \ Sec. 5, Tp. 132 N., R. 88 W. 



Ft. In. 



Shale, sandy, black and brown, with Pyrifusus newberryi (?), 

 fragments of Crassitellites, and a coral belonging to an 

 undetermined genus 16 6 



Sandstone, yellow, largely consolidated, but with lenticular 



concretions of hard sandstone 31 6 



Shale, sandy, dark gray, nearly black 52 o 



100 o 



Section of Lower Part of Fort Union Formation and Upper Part of 



Cannonball Marine Member of Lance Formation in South Bluff 



of Cannonball River, Secs. 31 and 32, Tp. 133 N., R. 88 W. 



Sandstone, yellow. Upper part massive, lower part thin-bedded Ft. in. 



and near base interbedded with thin bands of gray shale . . 30 6 



Sandstone, dark gray to black 3 6 



Sandstone, yellow, thin-bedded, interbedded with gray shale. . 13 6 



Sandstone, gray, concretionary 6 



Shale, bluish gray and somber-sandy 52 o 



Shale, dark gray 54 6 



Sandstone, yellowish gray, unconsolidated 5 o 



Sandstone, yellow, hard at top, containing Lunatia concinna, 

 Tunis minor, Fasciolaria huccinoides, Pyrifusus sp., 



Anchura sp., and an undescribed coral 6 o 



Shale, sandy, dark gray, grading at top into sandstone 31 6 



197 o 



