84 



ANNALS NEW YORK ACADEMY OF SCIENCES 



the characters are very similar to those on Muddy Creek. A mile north 

 of Middle Fork of Crazy Woman Creek the section is as follows : 



Feet 



Chalky clajs, light greeu above, maroon below 80 



Grayish-buff sandstone containing plants and saurian bones 6 to 12 



Maroon and light green chalky clays with thin sandstone layers 70 



White soft massive sandstone resembling the Unkpapa of the Black Hills 



region 12 to 15 



Greenish sandy clays (may belong to the Sundance formation) 20 



188 to 197 



Fig. 40. — Section of the Morrison forma- 

 tion north of Middle Fork of Crasy 

 Woman Creeks Wyoming. 



1.— Morrison formation; 2.-Sundance ^''''■J}:~^_^.':^'°1.''L L^.^.f ''^'l".!../!*'"'"" 

 formation. Scale, 125 feet to 1 inch. (Bar- 



ton.) 



tion near Bearer Creek, Wyoming. 

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



Near Beaver Creek the section is as follows : 



Feet 



Light green to maroon chalky clays containing a 2-foot bed of lime- 

 stone 10 feet below the top 50 



Sandstone 4 



Clays, in part maroon 25 



Sandstone [thickness not given, probably very thin]. 



Shale 10 



Limestone with no fossils IVz 



Red to maroon clays with thin sandstone layers 25 



Thin-bedded sandstone 2 



Soft, massive, white sandstone 20 



Clays (a few feet). 



1371/2 + 



South of Fort C. F. Smith, Montana, the following section occurs : 



Feet 

 Greenish-gray sandy shale, upper part soft (unconformably overlain by 



Cloverly sandstone) 18 



Buff sandstone 5 



