284 University of California Publications in Geology [Vol.8 



and J. P. Buwalda. Though the total amount of material secured 

 is small, it is desirable to place on record such information as is 

 now available, in the hope that it may be of assistance in a study of 

 the problem of correlation among the West American Tertiary for- 

 mations. 



Through the kindness of the Director of the United States Geolog- 

 ical Survey and of Mr. Pack, it has been the writer's privilege to make 

 an examination of the original vertebrate collection from the Tejon 

 Hills and to present the following description with a discussion of 

 the University of California material from this region. 



The majority of investigators who have examined the Tertiary 

 beds of the Tejon Hills are of the opinion that some of the vertebrates 

 occur in a formation corresponding to the "Temblor," or the com- 

 monly recognized Lower Miocene of the Kern region to the north. 



Mr. Pack, who has carefully studied the section of the Tejon Hills, 

 informs the writer that the Tertiary beds in this area are separable on 

 lithologic grounds into a lower division, comprising 800 to 1000 feet 

 of grayish sand and gravel with some indurated calcareous sandstones ; 

 and an upper division of somewhat greater thickness consisting of 

 reddish clay, sand, and coarse gravel. According to Mr. Pack the 

 whole of the lower division should probably be correlated with the 

 beds referred to the Lower Miocene in the Temblor Range, and the 

 upper division appears to be of somewhat later age. Horse teeth near 

 the Merychippus type were found in the uppermost part of the lower 

 division. Bones of Merycodus and a tooth of a horse near the Hip- 

 parion type probably came from the basal part of the upper division. 



Mr. Robert Anderson 2 in reporting on the Tertiary of the Tejon 

 Hills makes the following statement : 



"Marine fossils discovered in the Tertiary sand, gravel, and clay 

 of the Tejon Hills suggest that the beds are contemporaneous with 

 the Santa Margaritaf?) formation (upper middle Miocene) of the 

 Temblor Range. The fauna, however, is of a type occurring also in 

 the lower Miocene, and a definite correlation can not yet be made. 

 The fact that these beds lie directly upon the crystalline rocks favors 

 the supposition that they are a continuation of the lower Miocene beds 

 occupying a similar position on Kern River." 



Intensive study of the invertebrate fauna of this region will be 

 necessary before a fully satisfactory correlation with the other marine 



Anderson, Robert, IT. S. Geol. Surv. Bull., 471, p. 121, 1912. 



