86 



ANNALS NEW YORK ACADEMY OF SCIENCES 



thickness. Above this are 400 feet of 

 sandy shales, some dark maroon in 

 color, then 10 feet of very dark con- 

 glomerate loosely cemented, and at 

 the top about 10 feet of highly car- 

 bonaceous shale merging into dirty- 

 buff clay. 



Fig. 44. — Section of the Morrison forma- 

 tion on Alkali Creek, Wyoming. 

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



Fig. 45. — -Section of the Morrison forma- 

 tion on the Shoshone River, Wyoming. 



Scale, 125 feet to 1 Inch. (Hewett.) 



SHOSHONE RIVEB REGION 



The following section of the Morrison formation was made by Hewett, 



on the Shoshone Eiver, Wyoming (1914, 2) : 



Feet 



Shale, maroon and gray, sandy 50 



Sandstone, buff 6 



Shale, gray, sandy 12 



Sandstone, buff ^ 



Shale, gray, sandy 10 



Sandstone, buff, cross-bedded 8 



Clay, gray, sandy • 50 



