SPA NG iwAa a OL NOH LITO KINGANGOA SI RANGES WAZ ® 
question had not been studied in the southern Coast Ranges prior 
to the work done there by the writer. In that field numerous 
occurrences were noted where the Miocene unconformable over- 
laid the Chico, or Tejon, as the case might be. The non con- 
formity was pronounced wherever contacts could be found, for a 
distance of 200 miles, through the counties of Ventura, Santa 
Barbara, San Luis Obispo, and Monterey. Topographically the 
southern portion of this region is very rugged and difficult of 
exploration. The deep cafions and brushy mountains rising 5000— 
7000 feet make access to it almost impossible except along the 
scattered trails. Geologically portions are quite complex but there 
are large areas where the Cretaceous, Lower and Middle Ter- 
tiary are the only horizons represented. The assemblage of 
strata belonging to the Upper Cretaceous and the Lower Ter- 
tiary, known in geological literature as the Chico-Tejon series, is 
particularly prominent in northern Ventura and southern Santa 
Barbara counties. The Miocene not only forms complete moun- 
tain ranges, as for example, the Santa Ynez, but also appears as 
fringes along the Chico-Tejon elevations and in detached areas 
almost on their very summits. Beginning in northern Ventura 
county the various localities will be described where the relation 
of the Miocene to the Chico and Tejon was observed. Pine 
Mountain in northern Ventura county extends in an east and 
west direction between Cuyamas River on the north and the 
Sespe on the south. It forms the northern portion of a great 
thickness of dark shales and sandstones which have a width, 
north and south across their line of strike, of nearly twelve miles. 
Fossils were collected from two localities on this section, but so 
complex is the structure that the exact position in the series was 
not determined, although it seems that they are from the upper 
portion. On the northern slope of Pine Mountain the following 
fossils were collected: Meretrix horni, Gabb; Fusus vremondi, 
Gabb; Neverita globosa, Gabb; Dentalium pusillum, Gabb; Turris 
varicostata (?), Gabb ; Acteonella oviformis (?), Gabb; Turritella. sp. 
The horizon indicated is the Tejon. Near the head of the Matil- 
lija Cation, about eight miles southward, there was collected the 
