Geol.— Vol. II.] ANDERSON— STRATIGRAPHIC STUDY 1 65 



At the sulphur spring in one of the canyons of Zapata 



Chino Creek the Eocene is represented by the following 



members : 



ft. 



Kreyenhagen Shales 250 



Avenal Sandstones 500 



Basal conglomerate 15 



It will be seen that the Kreyenhagen Shales are consider- 

 ably reduced in thickness while the Avenal Sandstones are 

 somewhat thickened, but the latter was proved by the con- 

 cretionary masses, by the basal conglomerate, and by fossils. 

 The entire series stands at a high angle with a westerly 

 strike and a dip to the north. 



The Eocene could not be traced westerly beyond the 

 Sulphur Springs on the Jacalitos Creek. 



At the Point of Rocks on the northern border of the Ante- 

 lope Valley there are about twenty-four hundred feet of 

 Eocene strata exposed, the lowest beds of which contain the 

 following species : 



Neverita globosa Spondylus carlo sensis n. sp. 



Turritella uvasana Cardita 



Discoheli.v Terebratella 



Meretrix uvasana Sea urchins 

 Ostrea idriaeusis 



These beds dip northeaster^ at an angle of near 30°, and 

 to the eastward are overlain by the sandy beds of the Lower 

 Miocene. The upper one-third of the Eocene consists of 

 sands which include exposures like that shown on Plate xxvii. 

 Between the fossiliferous concretionary sandstones forming 

 the lowest beds exposed and the massive sand beds above, 

 there are softer and less resistant beds that perhaps represent 

 the shales which form elsewhere the intermediate member. 



At Temblor and Canara Springs the massive sands are 

 exposed, but the shales and fossiliferous beds below were 

 not identified. The unconformity of the Lower Miocene 

 beds upon these massive sands of the Eocene is well shown 

 on Plate xxv. 



In the areas extending northward from Coalinga the 

 Avenal Sandstones have been only indirectly proved. At 



