Vol. V] DICKERSON— FAUNA OF THE TYPE TEJON 35 



INTRODUCTION. 



The Tejon group of California has a very characteristic 

 fauna and, partially on this account, strata of this group have 

 been recognized easily in many places throughout this state 

 and in the neighboring states of Oregon and Washington. 



An examination of the fauna of the type locality of the 

 Tejon on Caiiada de las Uvas has revealed many new species 

 and many species described from other localities. The fauna 

 as a whole does not represent the entire assemblage of the 

 forms of the Tejon group, but only one zone appears to be 

 present. The discovery in the type Tejon of several new 

 species which had been described from the Washington Eocene 

 has led to this comparison of the Washington Eocene fauna 

 with that of the type Tejon. 



This paper deals with the faunal relations of the Cowlitz 

 phase of the Tejon group of Washington and that of the type 

 locality of the Tejon in California. In brief, the conclusions 

 of this comparative study are that the Cowlitz phase is in 

 reality identical with the faunal assemblage from the typical 

 Tejon at Cafiada de las Uvas, and that both faunas belong to 

 a middle zone of the Tejon group which will be called the 

 Rimella simplex Zone. 



HISTORICAL. 



The first recognition of Eocene on the Pacific Coast was 

 made by Conrad,^ and was based upon the fossils contained in 

 a boulder sent by Blake from Canada de las Uvas. 



Conrad described the following new species : Cardium lin- 

 teiini, Dosinia alfa, Meretrix uvasana, Mcrctrix calif orniana, 

 Crassafella uvasana, Mytiliis humerus, Volutilithes califonii- 

 ana, Bitsycon (?) hlakci^( Perissolax blakei), Clavatula (?) 

 calif ornica=(Fusiis calif ornicus) , Natica alveata=^(Ainaurop- 

 sis alvcata), and he identified V enericardia planicosta, Natica 

 cetites (?) , Natica gibbosa and Crassatclla alta of the Claiborne 

 Eocene. 



" Pacific Railroad Reports, App. to Prelim. Geol. Rept. of W. P. Blake, Palaeontology, 

 pp. 5-20, 1855. Reprinted in Pacific Railroad Reports, vol. 5, part 2, pp. 317-329, 1857. 



