450 STUDIES FOR STUDENTS 



River series, is made up of striped and banded sandstones, vary- 

 ing from gray to yellow, white, and red, with prevailing white 

 and red tints. As regards the relations of this with the under- 

 lying group, it should be repeated that the evidence has finally 

 accumulated so that there can be no longer a doubt where to 

 draw the line between the Cretaceous and the Tertiary series. I 

 unhesitatingly say that the bottom of the Vermillion Creek is 

 the base of the Tertiary, and that it rests in essential uncon- 

 formity (though locally in accidental conformity) upon the 

 Cretaceous." 



Scott, in a paper read before the British Association, corre- 

 lates the Wasatch with the Suessonien of Europe. 1 



the bridger formations (including Green River and Wind 



River). 



The Bridger is divided by Scott 2 into two substages, namely,.. 

 Wind River substage ( = Green River substage) , and Bridger 

 substage. The Bridger deposits are less extensive than the 

 Wasatch. 3 The Wind River beds lie chiefly in the valley of 

 Wind River, Wyoming, east of the Wind River Mountains. The 

 width of their outcrop is from one to five miles, and its length 

 about 100 miles. The beds reach a thickness of 1000 feet, and 

 are composed of sandstones and shales. 



The Green River beds are in the valley of the Green River 

 in Wyoming, Colorado, and Utah, on the west side of Wind 

 River Mountains. Paleontological evidence shows them to be 

 of essentially the same age as the Wind River beds, hence the 

 appropriateness of this name for both series. Outliers of Green 

 River beds occur west to about longitude Ii6° W. in Nevada,, 

 and King interprets this fact as showing that the waters in which 

 they were deposited were probably bounded by the Pinon Moun- 

 tains. 4 "The Green River series rests for the most part uncon- 

 formably upon the horizontal as well as the highly inclined 

 Vermilion Creek [Wasatch] beds." 5 These beds are described 



Science, n. s., Vol. II, p. 499, 1895. 2 Introduction to Geology, p. 496, 1897. 



3 Scott : loc. cit., p. 499. 4 Loc. cit., p. 393. * King : loc. cit., p. 378. 



