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University of California Publications in Geology [Vol. 1 



the northern area is indicated by fresh-water deposits in the Kettle- 

 man Hills. Although fossils are very abundant in this bed, only 

 the following forms could be identified: Anodonta nitida, n. sp., 

 Goniobasis, sp. 



KANGE OF TEMPEEATLTEE AND DEPTH 

 As shown by Ralph Arnold, the temperature of the ocean during 

 Etchegoin time was probably somewhat warmer- than that of the 

 Pacific Ocean in the latitude of Coalinga at the present time. A 

 large number of the Etchegoin forms, with other species indicative of 

 decidedly warmer water, at present live from Monterey to San Diego. 

 The large specimens of Pecten terminus Arnold are indicative of warm 

 conditions. Metis alto (Conrad) and Periploma argentaria Conrad 

 found in the lower Etchegoin indicate warm water. No cold-water 

 phases have been recognized. 



The invertebrate fauna of the Etchegoin is composed entirely of 

 forms living in shallow water. At some horizons, locally, forms char- 

 acteristic of brackish or even fresh water are present. Species char- 

 acteristic of considerable depth have not been found. 



SEBPULA(?) BEEF 

 In beds of middle Etchegoin in the Kreyenhagen Hills, on the south 

 bank of Garza Creek, sec. 35, a reef outcrops which is made up almost 

 entirely of tests of the genus Serpula(f) . This reef is exposed along 

 the hillside for about thirty yards, with a thickness of about one and 

 one-half feet. 



COMPABATIVE TABLE SHOWING STRATIGEAPHTC EELATTONSHTP OF 

 FAUNAL ZONES SOUTH OF COALINGA 



Arnold. 1010 

 Faunal zones 



Mya 



Pecten 

 eoalingensip 



Upper Mulinia 



Glycimeris or 

 Lower Mulinia 



Middle 



Big Trophon 



Nomland, 1916 

 Faunal zones 



Mya 



Pecten 

 coalingensi? 



Turritella nova 



Chione 

 elsmerensis 



Arnold, 1910 

 Formation 



Etchegoin 



Unconformity 



Jaealitos 



Nomland. 1916 

 Formation 



Etchegoin 



Unconformity 



Unconformity (?) Santa 



Margarita 



Santa 

 Margarita (?) 



