454 



University of California . 



[Vol. 3. 



Bar Gold Mining Company's property, the altitude of this 

 deposit was determined as about 2,100 feet. It is, therefore, the 

 lowest bona fide glacial deposit yet reported from the State of 

 California. 



For several hundred yards downstream the valley is a narrow 

 gorge, whose steep, rocky walls are nearly bare of soil to a 

 height exceeding 500 feet, and whose rugged face negatives 

 the idea of glaciation. The bottom of the gorge is encumbered 

 with huge boulders, over and between which the stream cascades, 

 descending at a rate probably little less than 1.000 feet per mile. 



At about one-fourth of a mile the gorge widens, and the north 

 side shows traces of two terraces, which continue downstream 

 for several hundred yards. The surface of the lower terrace 

 is a flatfish strip of boulders thirty to fifty feet wide, declining 

 downstream as rapidly as does the present stream-bed. The 

 heterogenity of the boulders and the presence with them of ordi- 

 nary creek gravel, make it evident that this is an older stream- 

 bed. It is bordered on the outer side by a precipitous bluff from 

 forty to fifty feet high. Exposures along the bank are poor, 

 lint it seems to be composed largely of boulders and gravel, 

 although in places the bed-rock seems to rise one-third or one- 

 half way up the bank. 



The higher terrace consists of coarse torrent fans built up 

 ;it the mouths of two ravines and the outer portions removed by 

 stream erosion in the formation of the lower terrace. The surface 

 of this upper terrace is a moderate slope leading up the ravines, 

 Init the outer border is a very steep slope. Drainage being now 

 largely through the coarse-textured material of the terrace, no 

 canons have been cut into the fans, so that the floors of the 

 mountain ravines end abruptly at the top of a steep bank, consti- 

 tuting a sort of "hanging valleys." The outer edge of the ter- 

 race is about 125 feet above the creek. 



These torrent fans apear to be of the same system as that 

 at the mouth of the North Fork, which seems to overlie one end 

 of the glacial moi^aine ; at any rate, they are of similar age, as 

 is evidenced by subsequent erosion by the main creek. Further, 

 I suspect they are the product of an abnormal climatic condition 

 which obtained for a short time in this region, for I do not 



