396 
TURNER. 
Faulting in the Lake Beds. 
Besides the local faulting at Bennett’s mine previously 
referred to, and which would be expected with any not 
thoroughly consolidated material on a steep slope, there is 
evidence of a line of faulting on the east side of Mohawk 
Valley. 
The lake beds on the east side of the Feather River oppo¬ 
site Wash Post Office are plainly faulted. A very evident 
fault exists in the lake beds on the south bank of the river 
about one mile up-stream from Wash Post Office. About 
one-fourth mile still further east, at the locality where I ob¬ 
tained the fossil leaves, a fissure was formed in the tufa and 
breccia beds overlying the fossiliferous series at the time of 
an earthquake shock some years ago (about 1876). 
This fissure was about two feet wide, and at the time warm 
air came out of it. The locality was formerly the resort of 
numerous rattlesnakes, attracted, no doubt, by the warmth. 
At the time of my visit, in 1889, slightly warm, moist air 
still issued from holes near the former fissure. A little,east 
of the fissure is a warm sulphur spring. Near this is an¬ 
other spring which, according to Abel Jackson, who lived 
here at the time, was so warm that at the time of the earth¬ 
quake the hands could not be held in the water. 
The lake beds are flexed just east of the springs at the 
Sulphur Spring House, showing disturbance. The springs 
have now a uniform temperature of about 75° as tested in 
1890. 
Artesian wells sunk along the west side of Sierra Valley 
in some cases strike flows of hot water. The land slides 
noted in connection with the river gravel by Cedar Creek 
may be connected with faulting. 
Relation of the Mohawk Valley Fault to the 
Structure of the Sierra Nevada. 
The different localities above mentioned, together with 
the hot artesian wells in Sierra Valley, are approximately 
in line, which coincides very well with the general line of 
