114 University of California Publications in Geology [Vol. ll 



2713. In Monterey series near Kern River on Barker's Ranch. 



2754. On Sobrante Ridge on branch of San Pablo Creek, 1% miles NE of Cali- 



fornia and Nevada Railroad ; elevation 350 feet ; Conta Costa Co., long. 

 122° 14' 1", lat, 37° 56' 54". 



2755. In valley N of Sobrante Ridge; on W fork of Bear Creek % mile from 



source; on N bank in tuff beds; elevation 800 feet. Contra Costa Co., 

 long. 122° 12' 35", lat. 37° 55' 58". 



3051. At head of Briones Valley, % mile SW of triangulation station on Lawson 

 Hill; near head of gully, 50 feet W of electric transmission line; eleva- 

 tion 700 feet; Contra Costa Co., long. 122° 12' 18", lat. 37° 56' 5". 



3055. In valley N of Sobrante Ridge; on W fork of Bear Creek % mile from 

 source; on N bank in tuff beds; elevation 800 feet; Contra Costa Co., 

 long. 122° 12' 35", lat. 37° 55' 58". 



3080. In diatomaeeous shale of Markley formation, on side of hill on E side of 



Markley Canon opposite L. Loughrie 's house; elevation 700 feet; SW 

 14 of Sec. 34, T. 2 N, R, 1 E, M. D. B. and M. Mount Diablo sheet. 



3081. Near mouth of Markley Canon on west side and almost directly opposite 



tunnel of Pittsburg railroad; elevation 750 feet; near SE corner of NE 

 14 of Sec. 33, T. 2 N, R, 1 E, M. D. B. and M. Mount Diablo sheet. 



