224 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



From the hills to the west and north of Belridge the out- 

 crops show the same sequence as in Lost Hills, i. e., Tulare 

 rests unconformably upon marine sandstones, shales, clays and 

 oil sands which contain Etchegoin fossils. 



From the center of Sec. 21 and Sec. 27, T. 28 S., R. 20 E., 

 in a sandy clay were found 



Pecten wattsi. Glycimeris septentrionalis. 



Cardium blandum. Zirphgea, species. 



Nassa californica. Panope generosa. 



Solen, species. Solen sicarius. 



Mactra, species. Lunatia lewisii. 



Modiolus rectus. Crepidula grandis (casts). 



Pseudocardium gabbi (Mulinia Trophon near coalingensis. 

 densata). 



McKlTTRICK 



The McKittrick section has been pretty thoroughly repre- 

 sented in the first part of this paper. The formations north 

 and west of the "South-End Area" are badly broken up by 

 an overthrust faulting, but the presence of rather character- 

 istic fossils from the oil horizon, as well as the general charac- 

 ter of the materials in which the oil occurs has led the writer 

 to believe that at least the greater part of the oil sands belong 

 to the Etchegoin formation. 



From the San Souci well, Sec. 18, T. 30 S., R. 22 E., at a 

 depth of about 1400 feet, large fragments of Pecten crassi- 

 cardo and Ostreo vespertina were blown out by a gas ex- 

 plosion. 



Pecten eldridgei and Cryptomya ovalis were obtained from 

 a similar horizon from a well in Sec. 12, T. 30 S., R. 21 E. 

 The logs of numerous other wells record "Sea shells" but it 

 is only occasionally that these can be specifically detennined. 



In the Midway-Sunset field the Etchegoin age and some of 

 the stratigraphic relationship of the oil bearing series is de- 

 terminable from well records, with considerable accuracy. 

 However, on account of the overlapping of the Tulare upon 

 the older formations, it is only occasionally, and in restricted 

 areas, that the Etchegoin is exposed on the surface. At two 

 localities Etchegoin fossils were found and the stratigraphic 

 sequence determined. 



