Clark: The San Lorenzo Series of Middle California 113 



1165. On first ridge N of Sobrante Ridge in road pass; % mile due E of source 



of W fork of Bear Creek, 125 feet above road on W side ; elevation 825 



feet; Contra Costa Co., long. 122° 12' 20", lat. 37° 56' 17." 

 1167. On first ridge N of Sobrante Ridge, % mile NE of head of left fork of 



Bear Creek; 100 feet from top of ridge; elevation 900 feet; Contra 



Costa Co., long. 122° 12' 37", lat. 37° 56' 17". 

 1173. On Sobrante Ridge, S of a small T-valley and near entrance to pass 



through which creek flows to join San Pablo Creek; elevation 625 feet; 



Contra Costa Co., long. 122° 14' 25", lat. 37° 57' 6". 

 1175. % mile E of W end of Briones Valley on N side; near road; elevation 



500 feet; Contra Costa Co., long. 122° 12' 46", lat. 37" 55' 51°. 



1309. On Santa Fe Railroad 1% miles NE of Muir Station; elevation 150 feet; 



Contra Costa Co., long. 122° 6' 21", lat. 37° 59' 58". 



1310. 1 mile N of E of Muir Station and 3/7 mile E of Santa Fe Railroad; 



elevation 225 feet ; Contra Costa Co., long. 122° 6' 40", lat. 37° 59' 40." 



1311. 1% miles SE of Muir Station on a direct line between Muir Station and 



Pacheco; elevation 200 feet; Contra Costa Co., long. 122° 6' 8", lat. 

 37° 59' 14". 



1312. 1% miles SE of Muir Station and % mile N of end of road crossing 



Martinez Ridge; elevation 275 feet; Contra Costa Co., long. 122" 6' 6", 

 lat. 37° 58' 53". 



1314. North edge of Concord sheet % m ^ c W of Santa Fe Railroad, % mile NW 



of Muir Station, on S side of Muir syneline at contact of Tejon and 

 San Ramon formation. 



1315. North edge of Concord sheet, 1% miles W of Santa Fe Railroad; S side 



of Muir syneline contact of Tejon and San Ramon formation. 

 1343. In creek bed 1% miles S of town of Walnut Creek, % mile W of sharp 

 bend in road; elevation 200 feet; Contra Costa Co., long. 122° 3' 34", 

 lat. 37° 52' 30." 



1458. In SW corner of SE % of Sec. 10, T. 1 S, R. 1 W, M. D. B. and M.; at 

 elevation of 1000 feet, on side of 1608-foot hill. Mount Diablo sheet. 



1524. (R, E. D. No. 131.) At elevation of 860 feet, on Sidney Flat, S side of 

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



1686. In creek % mile SW of town of Walnut Creek ; elevation 125 feet ; Contra 



Costa Co., long. 122° 3' 48", lat. 37° 53' 7". 



1687. ly-y miles S of town of Walnut Creek, in valley leading from San Ramon 



Valley to Tice Valley ; on bank of Walnut Creek % mile W of the 



point where it turns and flows west ; elevation 225 feet ; Contra Costa 



Co., long. 122° 3' 53", lat. 37° 52' 32". 

 1895. About 3 miles S of town of Pittsburg, north of Mount Diablo ; about % 



mile E of Kirker 's Creek; near center of SE % of Sec. 29, T. 2 N, 



R. 1 E, M. D. B. and M. Mount Diablo sheet, 

 1897. On S side of small knoll in Kirker 's Creek Valley; about 3 miles S of 



Pittsburg on W edge of SW V± of Sec. 29, T. 2 N, R. 1 E, M. D. B. 



and B. Mount Diablo sheet, 

 1900. On line between Sec. 32 and Sec. 33, T. 2 N, R. 1 E, M. D. B. and M. 



Mount Diablo sheet, 



2033. Not quite % mile S of 651-foot hill and about % mile W of Kirker 's 



Creek, in Kirker tuff; near W edge of Sec. 30, T. 2 N, R. 1 E, M. D. 



B. and M. Mount Diablo sheet. 

 2038. On W side of Markley Canon on SE side of 990-foot hill, in sandstone of 



Kirker formation; near N edge of SE % of Sec. 33, T. 2 N, R. 1 E, 



M. D. B. and M. Mount Diablo sheet. 



