University of California. 



[Vol. 3. 



ings there is a narrow channel remnant, possibly several hundred 

 yards long. The bed-rock floor is eighteen feet above an ordi- 

 nary stage of the river. It is overlaid by fifteen feet of ordinary 

 river gravel of a brown color, containing waterworn boulders 

 several feet in diameter. Over this is about twelve feet of a 

 mixture of angular debris and sandy clay of a brown color, 

 very slightly inclined to red. This is not a landslide deposit, 

 as its surface is even and forms a distinct terrace at forty-five 

 feet above the river. Back of it is the immense landslide already 

 mentioned, but this terrace is newer. 



Farther downstream the same channel has been extensively 

 mined, showing a rock bluff twelve feet high along the river, a 

 broad rock platform depressed behind the rim rock, then a 

 bank in which ordinary river gravel twenty feet thick occupies 

 the lower portion, and above this there is six to eight feet of 

 finely stratified fine gravel, largely of local slate debris, and 

 evidently the alluvial fan of a tributary stream. This passes 

 upward into five or six feet of sandy clay containing many 

 angular rock fragments of cobble size. The colors of the bank 

 are dark brownish gray and light brown, and there is no decided 

 reddish tint even in the top layer. The surface constitutes an 

 even terrace about forty-five feet above the river. 



Sandy Bar, a cultivated strip of land opposite the Pearch 

 Mine, is about 2,000 feet long and 300 to 500 feet wide. Near 

 the upper end, where the terrace form is best preserved, the 

 height of the outer edge of the bank is forty-five feet above 

 the river. For a long distance there intervenes between the 

 river and the Sandy Bar Flat a sort of lower terrace, which, 

 however, seems to be due to the erosion of the upper formation. 

 Along the bank bed-rock rises to ten feet above the stream, 

 and over it there is from eight to twelve feet of an" exceedingly 

 coarse gravel bed in which waterworn boulders from two to five 

 feet in diameter are very numerous. This deposit seems to pass 

 under Sandy Bar, and to be overlaid by twenty feet of finer 

 dark brown gravel, whose surface constitutes the dark brown 

 sandy soil of the flat. It is replaced farther downstream by a 

 thick bed of dark brown sand. In places the bar rises at a 

 considerable angle toward the inner edge because of slate debris 



