450 N. H. DAETON PALEOZOIC AND MESOZOIC OF WYOMIKG 



Section of Cloverly Formation on south Side of Sutton Lake; Wyoming 



Feet 

 Gray to light buff sandstone, cross-bedded below, softer 



above 70 



Coaly shale 1 % 



Sandy clays, greenish bnff below, black in middle, and 



gray near top 30 



Sandy shales with two cherty layers 20 



Clays, shales, and sandstones, part dark gray, part pur- 

 plish 40 



Sandstone, flne-grained, soft, with harder and coarser 



layers 40 



Sandstone, light gray, massive and cross-bedded, in part 



conglomeratic 35 



Morrison formation. 



Two miles south-southwest of Howell station, where the formation is 

 ahout 50 feet thick, it consists of two massive, coarse, hard sandstone 

 members separated by dark shale which has been prospected for coal. 



East side of Laramie mountains. — On the east side of Laramie moun- 

 tains the formation presents its usual tripartite character. In the small 

 exposure north and west of Hecla-the following beds appear: 



Section of Cloverly Formation near Hecla, Wyoming 



Feet 



Flaggy buff sandstone 10 



Shale, mostly concealed 20 



Buff" sandstone 14 



Soft, white sandstone 12 



Soft, shaly sandstone 8 



Conglomerate on Morrison 10 



Total 74 



Soiith of North fork of Horse creek the thickness is 100 feet. Near 

 Horse creek the sandstones are soft and are not well exposed, so that the 

 hard, lower sandstone of the Benton is much more prominent. 



Correlation. — ISTo fossils M'ere foitnd in tlie Cloverlj^ formation, but its 

 relations and physical features strongly suggest that the. basal sandstone 

 is equivalent to the Lakota sandstone of the Black hills, and the over- 

 lying purple shales to the closely similar Puson formation. Both of these 

 are of lower Cretaceous age. The top sandstone probably represents the 

 Dakota locally. 



COLORADO FORMATION 



Occurrence and general relations. — In the Colorado formation begin 

 the thick deposits of black shale Avhich characterize a large portion of the 



