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University of California Publications in Geology [Vol. 9 



of such forms as Trochocyathus striatus . . . and Schizaster lecontei 

 . and of glauconite. In both of these faunas two of the commonest 

 Tejon species, Turritella uvasana and Amauropsis alveata, are missing. 

 The fauna of South Table Mountain Eocene is merely a different facies 

 than that of the Marysville Buttes and the absence of the coral, echino- 

 derm, and glauconite mentioned above is due to differences in bathy- 

 metric conditions. The South Table Mountain Eocene was deposited under 

 littoral conditions, while that of the Marysville Buttes was deposited in 

 considerably deeper water. The differences in lithology confirm this con- 

 clusion. These faunas are approximately the same age, but deposited under 

 quite different conditions. 



The evidence stated above demonstrates the Eocene age of the 

 sediments beneath the Older Basalt, correlates these beds with the 

 Siphonalia sutterensis zone of the Marysville Buttes region and 

 shows their direct connection with the stream-laid deposits of the 

 Sierra Nevada. That the strata beneath the Older Basalt are iden- 

 tical with the lone at its type locality in Amador County will be evi- 

 dent after its description. 



THE IONE AT ITS TYPE LOCALITY 



LOCATION 



The lone formation from Oroville southward along the eastern 

 edge of the Great Valley exhibits many of the same characteristics 

 as were described at Oroville. A low westerly dip and an intimate 

 association with the Bench Gravels and the Deep Gravels of Lind- 

 gren and rhyolitic tuff of the Sierra Nevada are common to the 

 lone from Oroville south to the vicinity of Fresno. The type 

 locality of the lone is in the vicinity of the town of that name in 

 Amador County, California. The description of the type locality 

 is given below. 



Turner's Description of the Type Section 



Turner 5 " recognized three lithologic members in this formation : 



(1) the lower portion, a white clay; resting upon this (2) white or 



red sandstone; and then (3) a light-gray clay rock. (See plate 44, 



figs. 1 and 2. ) He described it as follows : 



Along the western border of the metamorphic rocks is a series of nearly 

 horizontally stratified, light-colored sediments, which were deposited in the 

 waters that covered the Great Valley at the time the older auiferous gravels 

 with interbedded pipe-clays accumulated in the river beds of the Sierra 

 slope. This formation attains its maximum development in the area of 

 the Jackson Sheet. The lower portion of the series, composed largely of 



so Turner, H. W., Jackson Folio No. 11, California, U. S. Geol. Surv., p. 2, 

 1894. 



