Petroleum Resources and Industries 

 producing, vary in depth from 300 to 4700 feet; 

 the daily production per well ranges between 4 

 and 3000 barrels, with a present daily average of 

 51.2 barrels. The product varies in gravity from 

 12.4° to 34.5° Beaume (0.9833 to 0.8519 specific 

 gravity), some of the oil carrying as high as 4 per 

 cent of parafiine, the highest of any in the State. 

 The oil comes from the Chico (Cretaceous), Tejon 

 (Eocene), and Vaqueros and Jacalitos (Miocene) 

 formations on the flanks of a great monocline, 

 across which a fold known as the Coalinga anti- 

 cline is developed. The upper end of the plunging 

 syncline between this anticline and the outcrop of 

 the oil sands of the monocline is also oil-bearing. 



Lost Hills District. — This district, in which is 

 included the recently-discovered Belridge field, lies 

 in the northwest corner of Kern County, about forty 

 miles south of Coalinga. The proved area of the 

 Lost Hills field proper consists of a strip six miles 

 long and 1000 to 2000 feet wide, along the crest 

 of the Coalinga anticline, embracing about 1300 

 acres. The Belridge field occupies a locally-satu- 

 rated area of 1100 acres or so on the Temblor 

 monocline, eleven miles south of Lost Hills. 



Adequate pipe-line connections are had with 

 Port Harford and San Francisco Bay. The wells, 

 of which there are now 251 producing, range m 

 depth from 500 to over 2000 feet; the daily pro- 

 duction varies from 10 to 500 barrels, with a pres- 

 ent daily average of 49.3 barrels. The oil from the 

 north end of the field comes from the Jacalitos 

 (middle Fernando) upper Miocene formation and 

 is of 18° Beaume gravity (0.9459 sp. gr.), while 

 that from the south end of the district comes from 

 the Santa Margarita (lower Fernando) and ranges 

 from 30° to 40° Beaume (0.8750 to 0.8235 sp. gr.). 



McKittrick District. — The McKittrick district oc- 

 cupies a narrow strip along the foothills in Kern 

 County, near the southwestern corner of the San 

 Joaquin Valley. The McKittrick field proper is 

 separated from the north end of the Midway field 

 by only two or three miles of unproductive terri- 

 tory, but the structure of the two districts is very 

 distinct. The proven territory in the field includes 

 about 1096 acres. The wells, of which there are 

 247 now producing, range in depth from about 

 600 to 1800 feet; the oil is dark-colored and varies 

 from 12° to 20° Beaume (0.9859 to 0.9333 sp. gr.). 

 The production of the individual wells varies from 

 2 to 1000 barrels per day, the present average being 

 43.2 barrels. The structure of the field is very com- 



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