THE EARTH MOVEMENT ON THE FAULT OF APRIL 18, 1906. 61 
a point east of Stewart’s Point. Here the line runs on the lower side of a double series 
of low ridges, interspaced with elongated swamps, and all trending parallel with the 
river. (See fig. 13.) Its bearing is N. 33° W., altho only short sights could be obtained 
on account of the timber and brush. The bearing noted is nearly in line with the axis 
of the valley of the South Fork of Gualala River. The amount of dislocation could be 
estimated only in a rough way from the offsets in the road leading east from Stewart’s 
Point to Lancaster’s ranch. A few neglected picket fences gave doubtful results, the 
alinement of the pickets having been previously disturbed by forest fires, fallen trees, etc. 
The horizontal movement is distributed over two strong, and one or more dim, lines of 
ZO/a- 
Scale (approx.) 
1 mile 
Contours 25 feet (approx.) 

Fig. 13.— Map of valley of South Fork of Gualala River, showing relation 
of fault-trace to geomorphic features. 
faulting, all of them producing offsets ranging from a few inches to several feet. The 
total displacement apparently did not reach 8 feet. As will be apparent from fig. 13, 
a logging road runs southeast parallel with the fault for 0.75 mile, and then crosses the 
same at an abrupt turn. It so happens that the road at this point has been cut thru one 
of the narrow ridges referred to, the depth of the cut being about 7 feet. ‘The movement 
on the fault has practically closed the cut, so that it is now barely passable on foot. 
The bridge over the South Fork of the Gualala River, 3 miles east of Stewart’s Point, had 
