PHYSICAL GEOGRAPHY 79 



from which former coverings of sedimentary- 

 strata have been removed by erosion, and which are 

 bordered on one or more sides by steep master fault 

 scarps, as in the instances of the San Gabriel and the 

 San Bernardino Highlands. 



HIGHLANDS OF THE TRANSVERSE BELT 

 The highlands of the Transverse Belt are many in 

 number. They include: (1) All of the east-west 

 islands of the Anacapa or Channel Group, the Santa 

 Monica Range, the Santa Ynez Range, the various 

 ranges of the Piru Divide and of the Ventura Group, 

 the latter of which are mostly folds of sedimentary 

 rocks which do not rise above five thousand feet; 

 (2) Master Highlands of the San Gabriel and San 

 Bernardino type, and certain minor ranges like the 

 Verdugo, little San Rafael, Washington, Repetto, 

 Montebello and Puente Hills, those latter being mostly 

 low eminences made in Pleistocene time; and (3) cer- 

 tain large but little known ranges of the desert side, the 

 chief of which are the Little San Bernardino, the Pinto, 

 the Eagle, Bullion, Sheep Hole and Orocopia Mountains. 

 These are much weathered fault blocks of various 

 metamorphic granitic and effusive rocks, probably 

 with some inclusions of Paleozoic sedimentaries. 



THE PmU DIVIDE 

 The term Piru Divide is herein provisionally used for 

 an unclassified and complicated region which consti- 

 tutes a highland barrier between the western portions 

 of Southern and Northern California and is also the 

 drainage divide between the Great Valley and the 

 Santa Clara River Valley of the South. It is a union 

 or meeting ground of most of the physiographic and 



