142 GEOLOGY OF TUE BLACK UlLLS. 



Jura. 



Feet. 



5. Saiulstone, red or pink, soft at bottom and hard at top, with numerous ripj)le 



iDarks 8 



4. Sandstone, yellowish and {rreenish, with some tinge 

 u fi~5^ of red ; containing some calcareous matter in 



« thin bands 10 



3. "White sandstone 3 



^^ „ . Red Beds. 



n 2. Deep red clay 50 



« 1. Gypsum to bed of creek . . 8 



I a From Amphibious Creek to Burntwood the 



2 s2 "^ Cretaceous rampart is very prominent, and near the 



■^ ^ ^- r: 



:= 5 ^ pass of the latter, called "Buftalo Gap," it culmi- 



^ d S' I nates in high hills. On French Creek, though the 



^5 t %=? entire Red Bed series is exposed in places, its struc- 



iS l^f " ^ -j^'.-'o ture is not well developed, and the Red Valley is 



'g but iioorly marked. 

 ^T|:sg ^ « From Battle Creek northward past Ra])id, ]3ox 

 '^'% I Elder, and Elk Creeks, the Red Valley has again a 

 ^ „ § fine development, extending to and joining the easi- 

 ly It .3 em extension of the great Redwater Valley on the 

 " . north side of the Hills, and having a width, includ- 



r: S o ing the outer slope of the purple limestone, of 



I 

 ** d ^5 from two to six miles. The profile and cross- 



S i'S' section are nearly the same as on Ami)hibious 



III Creek (Fig. 20) North of Rapid Creek the lime- 



'^ '^ ^-^ stone warj)s up and creates a ridge in the center of 



z-^ §■ the Red Valley, as shown in the accompanying 



^'^■Z figni'e (21). If the uplift be disregarded, an idea 



^w /?; -/ATy "^'ly he derived from the diagram of the general 



-myi^^-Wf ' structure of the Red Valley on the eastern side of 



^ %?« the Hills. 



The purple limestone is very prominent on the eastern side of the 



Hills. Along the entire margin it forms a gentle slope, rising from the red 



