274 University of California Publications in Geology [You 12 



Aeila gettysburgensis zone of C. E. Weaver, is not known to be present 

 in the San Emigdio region, unless the Acila gettysburgensis zone is 

 the correlative of the Vaqueros (Turritella inezana zone). 



C. M. Wagner and K. PI. Schilling,^ who have made a special study 

 of the geology and invertebrate palaeontology in the vicinity of San 

 Emigdio Creek immediately to the west and northwest of Teeuja Caiion, 

 determine the unconformable relationship of the San Lorenzo, both to 

 the Tejon Eocene below and to the IMonterey Miocene above. At Salt 

 Creek, according to the mapping of Wagner and Schilling, the San 

 Lorenzo deposits pinch out and to the east of this stream, namely 

 between Salt Creek and Teeuja Creek, the basal beds of the Monterey 

 rest directly upon the Tejon. 



Overlying the Tejon unconformably in the immediate vicinity of 

 Teeuja Canon are the red colored deposits or Teeuja beds containing 

 mammalian fossils, which indicate a late Oligocene or early Miocene 

 age for the land-laid sediments. The evidence derived from a study 

 of the geology and invertebrate palaeontology of the area between San 

 Emigdio Creek and Teeuja Creek siiggests the possibility that the 

 strata containing the vertebrate remains represents the initiation of a 

 period transitional in time between Oligocene and ^Miocene. Such a 

 view is perhaps in closest agreement with the known relationship of 

 Lower Miocene and Upper Oligocene vertebrate faunas found elsewhere 

 in North America. 



The apparent absence of structural discordance between the red 

 beds and the marine deposits lying immediately above them in the 

 Teeuja Caiion region, together with the fact that the existence of an 

 unconformity has been noted between the Monterey and the underlying 

 Oligocene and Eocene, may permit the assumption that the upper series 

 represents a depositional unit. Should the Teeuja beds be included 

 within the limits of the Monterey Series, the latter would not be 

 characterized by homogeneity of vertebrate faunas, for the mam- 

 malian assemblage known from the Merycliippus zone of the North 

 Coalinga region® is decidedly younger than that from Teeuja Canon. 

 It is unfortunate that the difference between the two faunas can not be 

 measured in terms of evolutionary stages of the Equidae, for the horse 

 group is as yet unknown in the Teeuja mammalian assemblage. There 



7 MS. 



8 Merriam, J. C, Tertiary vertebrate faunas of the North Coalinga region of 

 California. A contribution to the study of palaeontologie correlation in the 

 Great Basin and Pacific Coast provinces. Trans. Amer. Philos. Soc, vol. 22, 

 pt. 3, n.s., pp. 4^26, 1915'. 



