268 



University of California Publications in Geology [Vol. 8 



addition to this, the faunal break between the Vaqueros and the Tejon is very 

 great, as few if any species bridge the gap. In the extreme eastern part of the 

 area, the Cretaceous wedges out and the Miocene lies upon still older Mesozoic 

 strata. 



Marine fossils are fairly abundant at certain horizons in the upper 

 part of the Miocene section, but the lower part is without fossils except 

 those occurring in one or two sandstone beds intercalated with the 

 coarse gravels. (See plate 28.) These sandstone beds yielded the 

 species listed below. 



Partial List of Species From Lowermost Vaqueros, the Turritella 



Inezana Zone 



Scutella fairbanksi Arnold ... 



Scutella norrisi Pack 



Area, n. sp., a 



Mya, sp 



Pecten, sp 



Pecten bowersi Arnold 



Tivela inezana Arnold 



Natica, sp 



Turritella inezana Conrad 



Thais vaquerosensis (Arnold) 

 Balanus, sp 



2323 



X 

 X 



2325 2339 2321 



130 2337 



X 



The species obtained from the sandstone beds, while not abundant, 

 are quite characteristic of the lowermost Vaqueros or Turritella inezana 

 zone. 



In the upper portion of the Miocene section at several horizons in 

 different parts of the field the following fauna was obtained. 



Partial List of Species from Turritella Ocoyana Zone 



2345 2322 2341 



Scutella norrisi Pack 



Avicula, n. sp 



Chione temblorensis Anderson 



Cardium, cf. vaquerosensis Arnold 



( 'ardium, n. sp 



Dosinia, sp 



Macoma, sp. near secta Conrad 



Ostrea eldridgei Arnold 



F J anope, cf. generosa Gould 



Pecten lompocensis Arnold 



Pecten erassicardo Conrad 



Pecten, sp 



Phaeoides, cf. richthofeni Gabb 



Phacoides santacrucis Arnold 



2329 



X 



2338 



