534 E. RUSSELL LLOYD AND C. J. HARES 



the character of the strata of the Cannonball marine member and 

 of the strata which underHe and overHe it. 



Section near Base of the Cannonball Marine Member, in South Bluff 

 OF Cannonball River, Sec 7,3, Tp. 132 N., R. 87 W. 



Ft. In. 



1. Sandstone and sandy shale, yellowish gray 23 o 



2. Sandstone, yellowish gray, unconsolidated, with thin lenses of 

 shale near the bottom, containing poorly preserved leaf 

 impressions 22 o 



3. Shale, brown, sandy ■ 22 o 



4. Shale, bluish brown 2 o 



5. Lignite . 4 



6. Shale, bluish brown ■ 4 o 



7. Sandstone, gray, unconsolidated 45+ o 



8. Concealed to river level 15 o 



133 4+ 



In this section no definite line could be drawn between the lower 

 part of the Lance and the Cannonball member. No. i and prob- 

 ably No. 2 belong to the marine member. 



Section in South Bluff of Cannonball River, about Three-fourths 

 OF a Mile West of Foregoing Section 



Ft. In. 



1. Sandstone, yellow 25 o 



2. Shale, containing poorly preserved plant remains 4 o 



3. Sandstone, gray 



29 o 



The sandstone No. i in this section appears to be unconformable 

 on the shale. It is probably the lowest bed of the Cannonball 

 member. 



Section in Bluffs of Cannonball River, near Janesburg, North 

 Dakota, Tp. 132 N., R. 88 W. 



Ft. In. 



1. Sandstone, fine-grained, containing "cannonball" con- 

 cretions , 40± o 



2. Shale, dark, sandy 10 o 



3. Sandstone and sandy shale, light colored, with "cannon- 

 ball" concretions 21 6 



4. Shale, dark, sandy, with Perna n.sp 4 o 



