460 



University of California Publications in Geology [Vol. 9 



IX. Section in Rose Canon, San Diego County feet 



Tejon J B J Alternating beds of shale, white sandstone Test- 

 is ing on Chico 600 



Eocene 



AREAL DISTRIBUTION OP TEJON GROUP 



The Tejon has a much greater distribution than the Martinez, 

 which as far as known is confined to the San Francisco and Los An- 

 geles basins, small negative areas in the vicinity of these two California 

 cities. (See figures 11, 12, 13, 14.) No Martinez has been reported 

 from Oregon, Washington, or British Columbia, but the Tejon group 

 is represented by immensely thick beds in Oregon and Washington and 

 it is also found on Vancouver Island, as good specimens of Turritella 

 uvasana were collected by Professor Lawson from tuffs interbedded 

 with lava flows. The southernmost occurrence of the Tejon is at San 

 Diego. Tejon has been reported from Lower California at 29° 30' N. 

 latitude but the few fossils reported from there are Martinez forms. 

 Tejon is reported from Round Valley, Mendocino County by G-abb. 78 



Just what stage is represented is unknown, but the writer is in- 

 clined to think that it may be the Rimella simplex zone, as Gabb, who 

 knew the fauna of the type Tejon, said that there were several typical 

 Tejon forms present. The Tejon near Lower Lake is but a residual 

 and it has thus far yielded but a small fauna which has been placed 

 doubtfully as belonging to the third zone of the Tejon, the Balano- 

 phyllia variabilis zone. 



The lone facies of the Tejon group is found at several places in 

 the Redding quadrangle and it appears to underlie most of the coun- 

 try covered by later tuffs and lavas. This uppermost phase of the 

 Tejon Eocene, the lone, has yielded the Siphonalia sutterensis fauna. 

 In the upper Sacramento Valley on both the west and east sides 

 as well as the north end, the lone is but gently inclined. Dips of but 

 1° or 2° are usual in the littoral deposits beneath the basalt of Oroville 

 South Table Mountain. A similar condition is found along the eastern 

 border of the Great Valley. At Marysville Buttes the off-shore phase 

 of the Siphonalia sutterensis zone is found in deposits which dip in 

 all directions from the andesitic stump of this ancient volcano. The 

 Tejon of Lower Lake, which is about west of the Marysville Buttes, 

 is gently folded in the syncline near Lower Lake in marked contrast 



78 Gabb, W. M., Geol. Surv. Cal. Palaeontology, vol. 2 (preface, p. 13), 1869. 



