UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



Vol. 8, No. 2, pp. 17-25 Issued February 4, 1914 



NOTE ON THE FAUNAE ZONES OF THE 

 TEJON GROUP 



BY 



EOY B. DICKEESON 



CONTENTS 



PAGE 



Introduction 17 



Stratigraphy of the Tejon South of Mount Diablo 18 



Zone 1 20 



Zone 2 22 



Zone 3 23 



Siphonalia sutterensis Zone 23 



Transgression of the Tejon Sea 24 



Summary ;. 25 



INTKODUCTION 



Many collections made in the Tejon Group during the past four 

 years in various parts of the state have attracted the writer's attention 

 to the large and interesting fauna of the upper Eocene, a consid- 

 erable part of which is still undescribed. The necessity for careful 

 study of the faunal relations of the different members of the Tejon 

 group is particularly important. The type localities of both the 

 Martinez and the Tejon occur in California, and since the stratigraphic 

 relations in this State are on the whole more completely exhibited than 

 in either Washington or Oregon there is evident necessity for careful 

 study in California. 



The region south of Mount Diablo apparently represents as large 

 a portion of Tejon time as any other single section in the state, and 

 on this account the writer will regard this as the type region for 

 reference of the faunal zones of the Tejon group. The Tejon near 



