418 University of California Publications in Geology [Vol. 9 



gravels of the Sierras and the upper portion with the rhyolitic tuffs. 

 It can no longer be doubted that the lone is of the same age as the 

 rhyolitic tuff and the bench and deep gravels, and since the lone is 

 clearly Tejon-Eocene, the correlatives must be upper Eocene, at least 

 in part, and the land equivalent of the marine Tejon. 



Tejon Group in the Vicinity of Fort Tejon 



STRATIGRAPHY 



The Tejon group at the type locality is a portion of an east-west 

 strip which extends from Tunis Creek on the north flanks of the 

 Tehaehapi Mountains to a point about three miles southeast of Patti- 

 way where it is cut off by the San Andreas Fault. The map (see 

 figure 8) which is adapted from the "Preliminary Report on the 

 Geology and Possible Oil Resources of the South End of the San 

 Joaquin Valley, Cal.," by Robert Anderson shows the general distri- 

 bution of the Tejon very satisfactorily. 



The Tejon strata in the vicinity of Grapevine Creek rest upon a 

 Basement Complex consisting of granite rocks and associated schists. 

 The beds in general have a steep north dip of 75° to 85° but are dis- 

 turbed in places so that the dip is reversed. The basal member 

 about 250 to 300 feet in thickness consists of a very coarse conglomer- 

 ate derived from the granitic rocks of the Basement Complex. This 

 member is overlain by about 1000 to 1200 feet of thin-bedded brown 

 sandstone with subordinate strata of dark gray, clay shale containing 

 limestone nodules. The sandstone is, in places, conglomeritic and in 

 one locality the dark gray pebbles of shale yielded a small pecten. 

 The occurrence of this pecten suggests the deposition of Cretaceous 

 deposits which were completely removed during upper Eocene time. 

 The uppermost strata, about 1200 feet in thickness, consist chiefly of 

 light tan sandstone with subordinate strata of shale and brown sand- 

 stone. The total thickness of the Tejon group along Grapvine Creek 

 (Canada de las Uvas) is about 2500 feet. The Tejon is overlain by 

 volcanic ash of Oligoeene or Miocene age on the west side of Grapevine 

 Creek. Martin states that the uppermost Tejon beds in Live Oak 

 Creek are covered by a lava flow. 



FAUNA 



The middle portion of the Tejon group in the vicinity of Grape- 

 vine Creek is particularly rich in upper Eocene species. The basal 

 beds yielded but a small fauna (Cal. Acad. Sci. locality 246) which 



