MOOK, STUDY OF THE MORRISON FORMATION 



85 



Feet 



Massive gray sandstone 20 



Variegated shale ; pale red and green tints 75 



Ijight colored, fine-grained, soft sandstone lying on brown sandstone of 



the Sundance formation 25 



143 



The section near Tensleep is as follows : 



Feet 



Oray shale capped by Cloverly sandstone ... 40 ^^^^^=^£i^~! 



Oreenish-gray clays 100 



Maroon to red clays 50 



Sandstone 58 



Greenish-gray to reddish sandy shale 50 |-^=^r~^^=?E3 



298 



Fig. 42. — Section of the Morrison forma- 

 tion south of Fort G. F. Smith, Montana. 



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



Fig. 43. — Section of the Morrison forma- 

 tion near Tensleep, Wyoming. 



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



The following is a t3q3ical section of the Morrison on Alkali Creek : 



Feet 



Pale green massive shale (overlain 'by Cloverly sandstone) 50 



Thin-bedded gray sandstone, brown on surface 15 



Pale green massive shale 5 



Blue-black shale 10 



Maroon massive shale 10 



Variegated massive shale 45 



Thin-bedded gray sandstone 6 



Variegated massive shale, drab, purple and maroon 65 



Pale green to white sandstone 6 



Pale green and maroon massive shale 85 



Pale green massive sandstone 45 



Red sandy shale (lying on the Sundance formation) 40 



382 



ISTorth of Thermopolis the formation contains, near its middle, a 

 massive fine-grained, soft, greenish-gray sandstone 50 feet or more in 



