" FA UNAL RELA TIONSHIPS OF THE MEGANOS GROUP " 299 



Diablo, Camulos Quadrangle, and the Coalinga region. On pages 

 130 and 131 Clark states that 



After discussing the various Eocene sections, reasons will be given for 

 correlating the beds referred to the Meganos group in these different areas in 

 the Coast ranges with one another and with the marine lone formation in the 

 Sierra Nevada foothills, as mapped and described by Lindgren and Turner 

 not, however, including the type section of the lone.^ 



Why not discuss the type lone ? It is well described and at one 

 locality has yielded a fair but determinable marine fauna contain- 

 ing Turritella merriami and other typical Tejon species. Also the 

 strata of the type lone clearly intergrade with the Tertiary Aurif- 

 erous gravels of the Sierra Nevada foothills. Now the type lone 

 may be traced southward and connected with the Marine Eocene 

 strata a half-mile south of Merced Falls where specimens of Veneri- 

 cardia planicosta merriami may be collected in abundance. Farther 

 south, the stratigraphy of the lone clearly demonstrates deposition 

 by a sea transgressing from the west. North of the type section of 

 the lone, Lindgren and Turner have traced these beds through to 

 Oroville. Dr. Clark in his historical review quotes from Dicker- 

 son's "Note on the Faunal Zones of the Tejon Group" as follows: 



A study of the relationship between zone 3, Mount Diablo region, and the 

 Siphonalia sutterensis zone and their geographic position suggest that the 

 uppermost strata of the Marysville Buttes and Oroville were deposited by a 

 transgressing sea, and that only in favored places along the western borders 

 of the Sierra have the latest Eocene sediments been preserved from erosion. 

 Lava caps such as that of the older Basalt of South Table Mountain have 

 preserved these youngest Tejon sediments which have heretofore been regarded 

 as lone. 



This quotation creates the impression in the reader's mind that 

 Dickerson's concept of the Tejon-Ione relations was purely theo- 

 retical, whereas such is not the case. The stratigraphy of the lone 

 at Bear Creek 20 miles south of Merced Falls, at Merced Falls, at 

 lone, at Oroville, all clearly indicate deposition by a transgressing 

 sea in close proximity to an old Eocene shore. Into this Eocene 

 sea the streams of the low mountainous Eocene upland poured their 

 golden sands. The reader is referred to Dickerson's paper, " Stratig- 

 raphy and Fauna of the Tejon Eocene of California," for a full 



' Dickerson's italics. 



