52 CALIhURMA ACADEMY OF SCIENCES [Proc. 4th Ser. 



The Tejon consists of 200 feet of heavy bedded conglomer- 

 ate, 200 to 300 feet of shale, and 1700 to 1800 feet of shales, 

 fine sands and conglomerates, towards the base of which is the 

 oil bearing horizon. The fossils described were taken from 

 1000 to 1500 feet from the top of the upper beds. 



From the Sespe-Eocene contact to 300 feet below the contact 

 the following species were found at Locality 8 : 



Pinna lezvisi, new species; Dentalium cooperii Gabb, Natica 

 hannibali Dickerson, and Turritella uvasana Conrad. 



Tejon. — The formation mapped as Tejon in the Camulos 

 quadrangle consists of those sedimentary strata formerly 

 mapped as Topa-Topa,^^ and identical beds in Simi Valley. 

 The lithologic descriptions, and lists of fossils have been care- 

 fully considered and they can.be, in part, correlated with the 

 Tejon of the type locality.^^ Since the Topa-Topa sediments 

 fomi a conformable series with a distinct fauna which is iden- 

 tical with part of the Tejon formation, it would be less confus- 

 ing to future correlations if we drop Eldridge's local name. It 

 has served its purpose as a preliminary horizon name. 



Tejon in Simi Valley. — These sedimentaries are folded along 

 a NE.-SW. axis. In Simi Valley they overlie the upper 

 shales of the Martinez and dip to the NW. at an angle of about 

 35 degrees. They are exposed in the hills NE. and SW. of 

 Santa Susana^® and consist of over 2000 feet of strata. This 

 thickness consists of about 200 feet of conglomerate, 200 feet 

 of oil bearing shales, and 1800 feet of shale, sandstone, and 

 conglomerate. This upper shale member contains fossil plants 

 and is probably a fresh water phase of sedimentation. The 

 thickness of Tejon sediments in this entire region is very great 

 as compared with the 1850- foot section in the San Joaquin 

 Valley region where erosion took place through considerable of 

 the Martinez and lower Tejon time. 



Tejon north of Santa Clara River Valley. — North of Fill- 

 more, Eldridge^*^ lists fossils from beds exposed in Sespe Gorge, 

 north of Tar Creek. He assigned these fossils to the Sespe 

 (Eocene) and stated that they might be from beds below his 



" Bulletin U. S. Geol. Survey, No. 309, p. 5, 1907. 



" Geol. Survey California, Paleontology, vol. 2, preface, p. xiii, 1869. 



" See Bull. 69 Calif. State Mining Bureau, p. 383, 1914. 



=»Bull. U. S. Geol. Survey, No. 309, p. 11, 1907. 



