214 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th See. 



400 feet thicker. The greater thickness is due to a better and 

 more complete section of upper Tulare beds being exposed. 

 A third section was made across the hills to the west of the 

 little valley in the S. W. ^4 of Sec. 27. In this section the 

 sequence of beds again correspond very closely and show a 

 thickness of from 1250 to 1300 feet. 



Stratigraphy: The Tulare, as heretofore indicated, occupies 

 the outside of a southeastv^^ard plunging anticlinal fold. It 

 forms the outer rim of the hills to the south of McKittrick. 

 striking N. 60° to 65° W. and dipping to the northeast at 

 from 50° to 80°. In section 35 it swings south and west- 

 ward around the end of the anticline, thence along the sum- 

 mit of the hills to the northwest through the S. W. ^ of Sec. 

 27. On the southwest side of the fold the beds dip from 30° 

 to 42° to the southwestward. 



There is a small local anticlinal fold crossing the gulch in 

 Sec. 28, but it can not be traced for any distance on either 

 side of the gulch. Also along the contact with the Etchegoin. 

 notably in S. W. ^ of Sec. 27 local faulting has contorted 

 and displaced parts of the basal member of the Tulare. 



The basal member of the Tulare rests unconformably upon 

 the underlying sands of the Etchegoin. In this particular area 

 there are four proofs of unconformity, ( 1 ) difference of 

 strike and dip, (2) marked overlap within short distances, of 

 the Tulare upon the Etchegoin, Santa Margarita and Mon- 

 terey, (3) an abrupt change from fresh water to marine con- 

 ditions, (4) the Etchegoin beds of this locality, the Lost Hills, 

 the Midway fields and perhaps Sunset are not the Upper 

 Etchegoin of the Kettleman region but the lower Etchegoin 

 of the Coalinga district. This fact deserves to be emphasized 

 and the various lists of fossils available are such as belong to 

 and characteristic of the lower, though not the lowest Etche- 

 goin. 



Along the whole front of the slopes of the West Side Oil 

 fields from North McKittrick to San Emigdio Ranch, wher- 

 ever there are good exposures of the Tulare with the under- 

 lying beds, there is a discordance in dip and strike which 

 varies from a few degrees to as much as twenty degrees. This 

 differs in degree only from the condition in the Kettleman 

 Hills where angular unconformity is less visible and is repre- 



