1916] 



Dickerson: Tejon Eocene of California 



371 



Arnold, 35 Pack, 30 Dickerson 37 and Waring 38 have contributed 

 papers dealing with the fauna of the upper Eocene of California. 



DESCRIPTIONS OP TYPICAL TEJON AREAS IN CALIFORNIA 



Tejon Group South of Mount Diablo 

 stratigraphy 



The Tejon group south of Mount Diablo is a northwest-south- 

 east strip about ten miles in length. It has an unconformable 

 relation to the underlying Chico and Martinez. For a distance 

 of six miles this unconformity is marked by basal Tejon strata 

 containing boring shells which penetrate the underlying Chico or 

 Martinez rocks. In some places these borings are found in lime- 

 stone of Martinez age, again in Chico sandstone and Chico lime- 

 stone containing fragments of Inoceramus. (See Figure 1 and map.) 



Cave Pt 



Fig. 1. A North-South section through Cave Point on the north and 

 Oyster Point Ridge on the south. Chico strata are indicated on the ex- 

 treme left of the figure while Miocene sandstone is shown on the extreme 

 right. 



The Tejon is overlain by the Monterey and Oligocene. No differ- 

 ence in dip and strike was found between the Tejon and the over- 

 lying formations in this field. An unconformity or disconformity 

 probably exists here. At a locality in the bed of Walnut Creek 

 about one and one-half miles southwest of the town of that name, 



35 Arnold, Ralph, Palaeontology of the Coalinga District, Bull. 396, U. S. 

 Geol. Surv., 1909. 



36 Pack, R. W., Notes on Echinoids from the Tertiary of California, Univ. 

 Calif. Publ. Bull. Dept. Geol., vol. 5, No. 18, 1910. 



37 Dickerson, R. E., Fauna of the Eocene at the Marysville Buttes, Cali- 

 fornia, Univ. Calif. Publ. Bull. Dept. Geol., vol. 7, pp. 257-298, 1913; Note on 

 the Faunal Zones of the Tejon Group, ibid., vol. 8, pp. 12-25, 1914; Fauna of 

 the Martinez Eocene of California, ibid., vol. 8, pp. 61-180, 1914; The lone 

 Formation of the Sierra Nevada Foothills, Science, n. s., vol. 40, July 10, 1914. 



38 Waring, C. A., Eocene Horizons of California, Jour. Geol., vol. 22, pp. 

 782-785, 1915. 



