282 W. LINDGREN — TWO NEOCENE RIVERS OF CALIFORNIA. 



lance of one mile. The character of the gravel at this place is not differ- 

 ent from that of adjoining parts of the old river. It must be admitted 

 that this instance strongly suggests a deformation of the Neocene river 

 lied by an increase of the westerly slope of the Sierra. 



From Waloupa to Little York, a distance of one and a half miles, the 

 channel has a grade of 76 feet per mile. The direction has now turned 

 westerly. 



From Little York to Dutch Flat, a distance of two and a quarter miles, 

 there is a grade of 63 feet per mile. 



It should be stated that there is no perceptible difference in the char- 

 acter of the bed-rock between the Quaker hill and You Bet part of the 

 channel and the channel between Waloupa and Dutch Flat. The sud- 

 den increase in slope must be traced to other causes. 



The Channel <t( Dutch Flat. — In the Dutch Flatchannel a considerable 

 rise of the bed-rock occurs and the width narrows. Large bowlders are 

 found on the bed-rock and everything indicates a rapid current. This is 

 partly explained by the belt of hard quart/.ite and gabbro across which 

 the Neocene stream flowed at this place. 



Grade : 



In one mile, 227 feet. 



The Liberty Jfill Tributary. — This stream, which must have joined the 

 main channel at the upper end of the Dutch Flat diggings, can be easily 

 traced by way of Elmore hill. Liberty hill, Lowell hill and across Steep 

 HoIIoav creek to Remington hill. From .here its course has not certainly 

 been determined. 



Through the recent operations of a Gold Hill, Nevada, company at the 

 Centennial tunnel and shaft the existence of a deep channel from Phelps 

 hill southward lias been proved. According to information obtained 

 from the superintendent, Mr H. Richards, this channel, where at present 

 met with in the tunnel, is wide and flat, and has a grade eastward of 75 

 feet to the mile. The channel exposed by the San .lose shaft is stated to be 

 60 or 70 feet higher than the first channel, and probably connects with it 

 at some point further southward. There is, on account of high bed-rock, 

 no possibility that- the Centennial channel connects under the ridge with 

 the Omega channel, and the probability seems to be that a continuous 

 channel exists between Phelps hill and Remington hill, with a general 

 north-and-south direction. If so, its grade must, on the whole, he 

 slight, for Phelps hill is only 200 feet higher than Remington hill, which, 

 with a distance of four or five miles, would give an average grade of 40 

 or 50 feet to the mile. The Centennial channel contains granite bowlders, 

 which would seem t<> indicate that its headwaters were up in the granite 



