BULL. DEPT. GEOL. UNIV. CAL. 



VOL. 6, PL. 40 



A. Showing crumpling of less competent strata under compression where more com- 

 petent beds have fractured or else not yielded to deformation, causing lateral move- 

 ment along bedding planes. Borate member of Rosamond Series near Borate, Calico 

 Mountains. 



B. Characteristic erosion of Rosamond Series in Fed Rock Canon. The second es- 

 carpment is capped by a basalt flow. On the distant horizon are the peaks of the 

 Sierras, with their debris slopes in the middle distance. 



