112 University of California Publications in Geology [Vol. 11 



APPENDIX 1 



Unless otherwise stated, all references are to Concord sheet, U. S. Geol. Surv., 



1897 edition. 



DESCRIPTIONS OF LOCALITIES 



14. In valley N of Sobrante Eidge ; on W fork of Bear Creek, y 2 mile from 



source; on N bank; elevation 800 feet; Contra Costa Co., long. 122° 



12' 35", lat, 37° 35' 58". 

 52. iy± miles S of town of Walnut Creek, near top of first ridge W of Walnut 



Creek; elevation 350 feet; Contra Costa Co., long. 122° 1' 39", lat. 



37° 52' 44". 



76. About 3 miles S of Pittsburg and 1 mile W of Kirker 's Creek; in SW % 

 of Sec. 30, T. 2 N, E. 1 E, M. D. B. and M., Mount Diablo sheet. 



78. About 3 miles S of Pittsburg and 1 mile W of Kirker 's Creek, in bottom 

 of gulch ; close to W edge of SW % of Sec. 30, T. 2 N, E. 1 E, M. D. B. 

 and M., Mount Diablo sheet. 

 125. On first ridge N of Sobrante Eidge ; on top of hill N of source of W 

 fork of Bear Creek; 1% miles W of triangulation station on Lawson 

 Hill; elevation 1075 feet; Contra Costa Co., long. 122° 12' 55", lat. 

 37° 56' 35". 



189. 11/4 miles SW of town of Pacheco ; at source of S fork of creek which 



flows into Grayson Creek at Pacheco ; elevation 300 feet ; Contra Costa 



Co., long. 122° 5' 30", lat, 37° 58' 28". 

 199. 1% miles SE of Muir Station and 1% miles a little S of E of the town 



of Pacheco; 100 yards NE of end of first branch road on left side of 



road leading from Muir Station to Ygnacio Valley; elevation 250 feet; 



Contra Costa Co., long. 122° 5' 55", lat. 37° 58' 47". 

 331. On first ridge N of Sobrante Eidge; % mile SE source of W fork of 



Bear Creek; elevation 800 feet; Contra Costa Co., long. 122° 12' 22", 



lat. 37° 55' 58". 



517. 2 miles directly S of town of Walnut Creek; on E side of ridge to E of 

 Tice Valley ; elevation 550 feet ; Contra Costa Co., near W edge of 

 SW % of Sec. 2, T. 2 S, E. 2 W, M. D. B. and M. 



1131. % mile SW of town of Walnut Creek; in creek bed about 100 yards to E 



of Oakland and Antioch bridge ; elevation 150 feet ; Contra Costa Co., 

 long. 122° 4' 8", lat. 37° 53' 7". 



1132. 3% miles NW of town of Walnut Creek; 200 yards SE of point where 



road from Muir Station to Walnut Creek crosses Grayson Creek; eleva- 

 tion 100 feet; Contra Costa Co., long. 122° 4' 55", lat. 37° 57'. 



1134. On SW side of Martinez Eidge, 2% miles SE of Muir Station and % mile 

 N of juncture of Muir Station, Walnut Creek road, and the branch road 

 to town of Pacheco; elevation 325 feet; Contra Costa Co., long. 122° 

 5' 45", lat, 37° 57' 58". 



1162. On Sobrante Eidge, % mile SW of head of left fork of Bear Creek; on 

 W side near top of 1000-foot hill; elevation 1000 feet; Contra Costa 

 Co., long. 122° 13' 20", lat. 37° 56' 13". 



1164. On top of first ridge N of Sobrante Eidge, % mile due E of source of W 

 fork of Bear Creek; elevation 950 feet; Contra Costa Co., long. 122° 

 12' 32", lat. 37° 56' 17". 



