Vol. VII] WARINGSTRATIGRAPHIC AND FAUNAL RELATIONS 



49 



and Cretaceous age are brought into contact with the later 

 Miocene sediments. To the north, the Simi fault has brought 

 the Chico sandstone up against the Vaqueros. The Chico dips 

 uniformly to the north, and over it lie the Martinez and Tejon 

 in an apparently conformable series. To the south the Santa 

 Monica fault has brought about relations similar to those in 

 the north. Here metamorphics of probable Jurassic age are 

 brought up below the Chico. This southern area has been a 

 region of volcanic flows and intrusions, so that the relations 

 are not so easily seen in the field as in the north. 



Structure of the Region 



The cross section, fig. 2, is taken along a NW.-SE. line, 

 A-A', through the area. The interior portion of the area con- 

 sists of a broad syncline of Vaqueros and Monterey which have 



SEA LEVEL 



Fig. 2 

 been faulted down against the Chico on either side. To the 

 north the Chico and overlying Eocene have been faulted, such 

 as to cause a repetition of the formations. The Eocene is over- 

 lain by Vaqueros which outcrops again north of Simi Valley. 

 To the south, the Chico has been faulted and the Martinez 

 brought down against it. 



Relations of the Cretaceous and Eocene 



Chico. — The northwest corner of the Calabasas area is cut 

 by two faults (see geologic map, fig. 3, p. 51). The smaller of 

 these runs approximately east-west and runs into the main Simi 

 fault about where it crosses the Los Angeles- Ventura county 

 line. This faulting has brought up two small fossiliferous Cre- 

 taceous areas with their overlvingf sandstones and Eocene. The 



