436 University of California Publications in Geology [Vol. 9 



other parts of the state is important. The writer's conclusions from 

 this faunal study are, in brief, that the Tejon of San Diego County 

 is the equivalent of the Tejon of the type locality, the Rimella Sim- 

 plex zone. (See figure 12.) No other zones of the Tejon group 

 were recognized in this region and no Martinez-Eocene strata were 

 discovered. This study shows that the diastrophic record in Southern 

 California has been quite a different one from that of the southern 

 San Joaquin in the vicinity of Canada de las Uvas, where Eocene 

 beds have been folded and faulted in an intricate fashion. 



The occurrence of the Tejon group near San Diego was recognized 

 early by Gabb 72 and Cooper. 73 Both Gabb and Cooper described 

 several species from the Tejon of Rose Canon. Fairbanks 74 re- 

 ported both Tejon and Chico-Cretaceous from Point Loma, the con- 

 tact between the two being nearly at sea level. Arnold 75 reported an 

 angular unconformity between the Tejon group and the Chico near 

 La Jolla : 



It is a noteworthy fact that with one exception, wherever the line 

 between the marine Eocene formations (Martinez, Arago, Tejon, etc.) and 

 the Cretaceous beds are either of lower Cretaceous (Knoxville) or middle 

 Cretaceous (Horsetown) age, and that wherever the Eocene rests on the 

 Chico, or upper Cretaceous, excluding the case at San Diego, the un- 

 conformity is not angular, and as far as the stratigraphic evidence goes, 

 the two formations represent an apparently uninterrupted period of sedi- 

 mentation. 



The one exception mentioned by Arnold is the Tejon-Chico rela- 

 tion at San Diego. It has been shown elsewhere that angular un- 

 conformities occur between the Eocene and Cretaceous in California 

 at several localities. Arnold's discovery of the unconformity at 

 San Diego shows that the same condition prevails here as the writer 76 

 has shown to exist in the vicinity of San Francisco Bay. 



STRATIGRAPHIC NOTES 



The Tejon in the vicinity of San Diego County is associated with 

 underlying Chico-Cretaceous, and with the overlying San Diego Plio- 



-2 Gabb, W. M., Geol. Surv. Calif. Palaeontology, vol. I, p. 95, 1864. 



" Cooper, J. G., Catalogue of California Fossils, Bull. No. 4, California 

 State Mining Bureau, p. 36, 1894. 



74 Fairbanks, H. W., The Geology of San Diego, San Bernardino and 

 Orange counties, 11th Ann. Report Cal. State Mining Bureau, pp. 76-120, 

 1894. 



" Arnold, Ralph, Environment of the Tertiary Faunas of the Pacific 

 Coast of the United States, Jour. Geol., vol. 17, p. 513, 1909. 



70 Dickerson, R. E., Fauna of the Martinez Eocene of California, Univ. 

 Calif. Publ. Bull. Dept. Geol., vol. 8, pp. 61-180, 1914. 



