110 T. Jr. Stanton — Sfratigraphic Position 



series of alternating sandstones, shales and conglomerates. 

 Beneath the conglomerate there are reddish brown thin bedded 

 sandstones and sandy shales forming the axis of an anticlinal 

 fold. No fossils were found in the latter beds but they have 

 a close resemblance to the strata in which Jurassic fossils were 

 found near Bear River City, and they are separated from the 

 Bear River formation by similar conglomerates and sandstones 

 at both places. 



Cokeville Section. 

 From the mouth of Smith's Fork eastward. 



1. Carboniferous. 



Blue limestone and shales in a sharp anticlinal fold 1200 ft. 



Thin bedded limestone and shales with some arenace- 

 ous layers 600 ft. 



Total 1800 ft. 



2. Triassic? 



Red shales and sandstones not well exposed 700 ft. 



Blue, limestone with Aviculopecten, etc. Dip 70° east, 150 ft. 



Total S50 ft. 



3. Bear River Formation. 



Covered about . _ . - 50 ft. 



Dark shales with carbonaceous seams and calcareous 

 layers containing numerous specimens of Gorbula 

 pt/riformis, Unio belliplicatus and other Bear River 

 species. Dip 60° west. This is seen in a tunnel 

 that has been driven in search of coal. 



Mostly covered for a distance of 2250 feet. In this 

 space there are some small exposures of shale and 

 two or three bands of sandstone one of which con- 

 tains Ostrea. 



Variegated shales and thin bands of sandstone. The 

 west half contains Pyrgidifera humerosa, Gonio- 

 basis macilentrr, etc., and several seams of coal on 

 which some mining has been done. Dip 80° west. 

 Thickness about 700 ft. 



Total thickness probably 2500 ft. 



4. Dakota? 



Alternating beds of coarse gray and brown sandstone, 

 and covered spaces that are probably underlain by 

 shales . 1 125 ft. 



Brown pebbly conglomerate. Dip 80° west 125 ft. 



Total 1250 ft. 



5. Jurassic ? 



Greenish gray shales and shaly sandstones 75 ft. 



Reddish brown thin bedded sandstones with some 

 sandy shales. Dip at top 75° west diminishing to 

 65° at the base. Estimated thickness to the river.. 400 ft. 



Total exposed - 475 ft. 



