1915 J Clark: Fauna of the San Pablo Group 511 



1940. About 1% miles southeast of town of Walnut Creek, in gully opening 

 toward the northwest in ridge southwest of Shell Ridge; almost due 

 south of the first letter S in the word Nueeesy Bolbones, as seen on 

 the Concord Topographic Sheet, U. S. G. S., 1897 edition. 



1934. About 1% miles east of town of Walnut Creek, on ridge parallel to and 

 south of Shell Eidge; on the east end of the northern of the two 

 knolls which lie just southeast of the letter S in the word Shell, as 

 seen on the Concord Topographic Sheet, 1897 edition; elevation, about 

 350 feet. 



1944. A little west of and lower in altitude but higher stratigraphically than 



loc. 1936; on the side of the same hill. Concord Topographic Sheet, 

 U. S. G. S. 



1945. In gulch just west of loc. 1944 and in same horizon. Concord Topographic 



Sheet, U. S. G. S. 



1946. Southeast of Walnut Creek, on south side of highest hill in ridge to 



south of and parallel to Shell Eidge; elevation about 450 feet. In 

 about the same horizon as loc. 1944. Concord Topographic Sheet, 

 U. S. G. S. 



1947. On south side of same hill as loc. 1946; about 50 feet higher in elevation. 



Concord Topographic Sheet, U. S. G. S. 



1948. Southeast of Walnut Creek, on top of first knob to west of where creek 



cuts through ridge, which is south of and parallel to Shell Eidge. 

 Concord Topographic Sheet, U. S. G. S. 

 1950. Southeast of Walnut Creek, on top of first knob west of where creek 

 cuts through ridge which is south of and parallel to Shell Edige; on 

 small knob just north of knob on which loc. 1948 is; stratigraphically 

 lower. Concord Topographic Sheet, U. S. G. S. 



1952. Southeast of Walnut Creek, on 475-foot contour, where it crosses creek 



that cuts through ridge south of and parallel to Shell Eidge. Con- 

 cord Topographic Sheet, U. S. G. S. 



1953. Southeast of Walnut Creek, on top of hill east of creek which cuts 



through ridge south of and parallel with Shell Eidge. Concord 

 Topographic Sheet, U. S. G. S. 



1954. Southwest of Walnut Creek, on south side of first knoll west of loc. 1953; 



in first gully just east of where creek cuts through ridge. Concord 

 Topographic Sheet, U. S. G. S. 



1955. On little knoll exactly one-third mile southwest of the letter G in the 



word rihell Eidge, as shown on Concord Topographic Sheet, U. S. G. S., 

 1897 edition; in same horizon as loc. 1954. 

 1958. Southwest of Walnut Creek, near east edge of Concord Topographic 

 Sheet. It is 8% inches from the top of the Concord Sheet, 1897 

 edition, and about one-quarter inch west of the east edge, on east 

 side of 800-foot hill, above road which crosses Shell Eidge above dairy 

 ranch. 



1960. A little south of loc. 1958, about 200 feet north of barn of dairy ranch. 



1961. The same general locality as loc. 1958, on south side of hill between 



house and barn to the east of and about 125 feet above fence which 

 runs near barn. Concord Topographic Sheet, IT. S. G. S. 



