BULL. DEPT. GEOL. UNIV. CAL 



VOL. 6, PL. 42 



A. Olivine basalt, flow covering peneplaned surface of tuff-breccia member of Rosa- 

 mond Series near the head of Black Canon. The basalt lias probably been faulted in 

 forming the peak's on the horizon line. 



H. Looking south towards 1 lie mining camp of Borate, Calico Mountains. Tuff- 

 breccia member of Rosamond Series in foreground, capped in righl middle distance by 

 later lava flows. The low lying light colored beds in the distance belong to the Borate 

 member, and the hills above them are composed of lava. In the middle is a typical 

 high-level valley. 



