176 REPORT UNITED STATES GEOLOGICAL SURVE^ 



Laramie group appearing, and below them the shales and 

 of the Fox Hills Cretaceous. 



We left the plateau at the head of Eoan Creek, and f( 

 stream to Grand River. Where we descended, the cliffs 

 1,400 feet high. This is just east of Station 27. The strata 

 horizontal, and belong to the Green Kiver group. A sh( 

 down the stream we reached the Wahsatch beds, which c 

 outcrop along the creek almost to its mouth. The variegatt 

 of these beds is very marked in this region. 



There are slight evidences of an anticlinal fold in the Wa 

 in the bottom of the valley. In the cliffs the Green Eivi 

 -pears to be horizontal, and there must therefore be either ac 

 ability between the two groups or erosion has removed tha 

 the Green Eiver group which was affected by the fold. Er 

 obscured the beds in the valley that it is difficult to determi 

 conditions. That there was a fold I think is evident, and 

 hills bordering the creek on the upper part of its course, foi 

 anticlinal, the creek occupying the axis of the fold. This f( 

 determined the course of the creek. As we go down the str( 

 appears to die out. 



As we approach Grand Eiver a series of massive and lam 

 stones appears beneath the Wahsatch group. South of W 

 ain these sandstones form bluffs of 400 to 500 feet facin 

 They probably represent the upper part of the Laramie grou 

 ing up the river these sandstones soon disappear, and tl 

 Wahsatch beds also sink for a short distance, but soon rise 

 continue almost horizontal. What dip there is appears 1 

 the north. The white and yellow beds of the Green Eivei 

 cliffs at the summit of the bluff, while the underlying sofi 

 beds weather in their characteristic slopes. This is well si 

 2, Plate X (a sketch of the Eoan Cliffs on Grand Eiver, i 

 Holmesi. 



Between Parachute Creek and Cactus Valley the Wahsatc 

 the characteristic weathering of Bad Lands into columns 

 Along the river there are well-marked terraces cut in the so 

 the south side these terraces are covered with bowlders ol 

 have been washed from the Battlement mesa. I did not u 

 the north side. The steepness of the cliffs on the north sid 

 deep gullies to be cut by the small branches of the Gran( iis 



on the south side are more rounded, and the stream-beds r ■ \ 



depth. 



In Cactus Valley we found the variegated beds formiuj 

 facing the river, and low hogbacks inclining from the Grai 

 Eange. This, however, lies in Dr. Endlich's district, : 

 described by him. The only portion of the district rem-c 

 described is the Little Book Cliffs, through which Granc 

 its hogback cailou from the mouth of Plateau Creek to ( 

 Valley. 



LITTLE BOOK CLIFFS. 



The Little Book Cliff's extend from Grand Eiver north 

 East Salt Creek, a distance of some thirty miles. Fig. 

 gives a view of the cliff's as seen from the south side of the < 

 cliffs are about 1,800 feet in average height. I^ear the Gi 

 lowing is the section (point c f in Fig. 3, Plate X). The thi 

 measured by angles taken with the gradienter from a stJ 

 south side of the Grand. 



