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University of California Publications in Geology [Vol. 7 



That these glauconitic sediments were deposited along an open 

 ocean seems probable. Whether this is a unique condition 

 in the Tejon is a question that arises immediately. The condi- 

 tions of deposition during' portions of Tejon time were evidently 

 fairly uniform over California. White to dull red quartzose 

 sandstones with cavernous weathering are typical of Tejon sec- 

 tions from San Diego to Lake County. Such a uniformity in 

 lithology might be explained by deposition along a coast un- 

 broken by large islands and peninsulas. The evidence indicates 

 that no extensive or continuous land masses existed along the 

 California coast west of the Sierras during Tejon time. 

 Although sediments deposited in fresh or brackish waters are 

 found, they appear to represent local oscillations of the strand 

 line or estuarine deposits only. During most of Tejon time, a 

 great embayment probably stretched from southern California 

 to the region of Marysville Buttes, curving westward north of 

 Mendocino County. 



Zonal Position op the Marysville Buttes Fauna 



Of the species listed above from the Eocene at Marysville 

 Buttes the following occur both in the Martinez and the Tejon : 



Cylichna eostata Perissolax blakei 



Dentalium stramineum Aeila t.runcata 



Galerus exeentrieus Leda gabbi 



Lunatia hornii Schizaster lecontei 



Niso polito 



There are no distinctive Martinez species in the list, and the 

 fauna has little or no suggestion of Martinez affinities. The 

 following species are reported from Tejon localities : 



Cancellaria irelaniana Cardita planicosta 



Lunatia miciformiis Dosinia elevata 



Morio tubereulatus Glycimeris cor 



Olivella mathewsoni Meretrix hornii 



Sureula (Surculites) sinuata Mysia polita 



Sureula monolifera Ostraea idriaensis 



Tritonium californicum Solen parallelus 



Tritonium whitneyi Tapes eonradiana 



Area hornii Troehoeyathus striatus 



Avicula pellucida Nodosaria, sp. 

 Corbula parilis 



