MOOK, STUDY OF THE MORRISON FORMATION 



59 



Feet Inches 

 Massive red sandstone 5 



Soft red sandstone containing hard laj^ers which are 

 ripple-marked 30 



Hard, white, argillaceous limestone composed of numer- 

 ous thin layers ; greatly contorted 4 



Red sandstone In thin flaky layers 15 



(River bottom.) 



^!".""".n'!;7r ! i!r' 



Pig. 17. — Section of the Morrison and re- 

 lated formations in Plum Canyon, Colo- 

 rado. 



I. — Purgatoire-Dakota ; 2. — • Morrison ; 

 3. — Gypsum at the top of the Red Beds. 

 Scale, 125 feet to 1 inch. (Lee.) 



Pig. 18. — Section of the Morrison and re- 

 lated formations in Red Rocks Canyon, 

 Colorado. 



1. — Purgatoire ; 2. 

 sum and Red Beds, 

 inch. (Lee.) 



—Morrison ; 3. — Gyp- 

 Scale, 125 feet to 1 



Section in Red Rocks Canyon 



Feet Inches 

 Dakota (Purgatoire) sandstone. 

 Brick red arenaceous shale, containing bands of hard, 



fine-grained sandstone 25 



Reddish limestone having a conchoidal fracture and 



very brittle 3 to 5 



Soft dark clay shale 30 



Light brown clay shale 11 



Argillaceous limestone 6 ■ 



Brown shale 7 



Concretionary limestone 1 



Variegated clay shale ; joint structure 7 



Fine yellow paper shale 3 



Argillaceous limestone, finely laminated 6 



Fine shale 18 



White limestone ; 1 



Variegated clay shale 15 



