198 University of California Publications in Geology [Vol.10 



Kreyenhagen Hills, the upper Etchegoin, the lower Etehegoin, and the 

 Tulare show excellent exposures. In the Kettleman Hills only the 

 upper Etchegoin and the Tulare are represented by outcrops. 



The Etchegoin to the north of Coalinga is not so fossiliferous as 

 it is to the south, and the lithologic characters typically developed 

 farther south are absent. In the northern area the separation into 

 the upper and lower Etchegoin on the basis of fossil zones becomes 

 impossible. It also becomes exceedingly difficult to separate the Tulare 

 from the underlying formations and from the alluvium of the valley. 

 Judged by lithologic characters, the lower Etchegoin appears to be 

 present at Cantua Creek. Characteristic beds presumed to be sub- 

 aerial found in the vicinity of Oilfields near the base of the lower 

 Etchegoin also seem to be present at that creek. In these deposits 

 vertebrate material has been found. About twenty miles north of 

 Cantua Creek the Etchegoin and the Tulare both disappear, being 

 overlapped by the alluvium of the San Joaquin Valley. 



In the mapping of the McKittrick district beds probably of the 

 same age as those which had been separated into three formations 

 in the Coalinga district by Arnold and Anderson were grouped by 

 Arnold and Johnson 1 ' 1 as the McKittrick formation. In portions of 

 this district the McKittrick group is known to be represented both 

 by the upper and lower Etchegoin and the Tulare. 



Several secondary synclines are found in the Diablo Range. In 

 many of these synclines, which usually extend in a northwest-southeast 

 direction, are found extensive deposits of Pliocene. Among others 

 may be mentioned Sunflower Valley, Waltham Creek-Priest Valley, 

 White Creek Syncline, and Vallecitos Syncline. 



In the White Creek Syncline the lower part of the upper Etche- 

 goin rests unconformably on the upper Cretaceous. The basin of 

 deposition of the upper Etchegoin evidently had a greater extent in 

 this direction than in the lower Etchegoin, as shown by this overlap. 

 That a more extensive movement took place in middle Etchegoin seems 

 to be suggested by the fact that in the region near Sargent, Santa 

 Clara County, the upper Etchegoin rests unconformably on the Fran- 

 ciscan and Monterey with no lower Etchegoin present. Along the 

 upper part of Jacalitos Creek only the lower Etchegoin is found, the 

 upper portion apparently having been removed by erosion. In the 

 upper part of the Waltham Creek Basin are exposures of both the 



is Arnold, Ealph, and Johnson, Harry R., Preliminary report on the Mc- 

 Kittriek-Sunset oil region of California, U. S. Geol. Surv. Bull. 406, 1910. 



