PROC. CAL. ACAD. SCI., 4th Series, Vol. XI 



DICKERSON] Plate 36 



Fig. 1. Triplicate Rift Lines. View from one and one-half miles southeast of feta- 

 luma Reservoir looking northwest. A fault shelf is seen in lower right, a kernbut in center 

 and a notched skyline marking the three lines of rifting in the background. 



Fig. 2. Looking southeast along the Hay ward Fault line two miles from Petaluma 

 Reservoir, rift zone is marked by three lines, two of which are indicated by a kernbut, a 

 wooded hill in the right center of the picture. 



