GEOLOGY OF BAJA CALIFORNIA. 



27 



and is occupied by a steep and high mountain range, con- 

 tinued northward for still 25 miles more by rocky islands, 

 among which the largest is called Cerros or Cedros. The 

 peaks of this range, which, from the bay to the north of 

 it, I shall, to avoid repetition, designate as the Viscaino 

 Range, rise to a height of about 3500', while Cerros Island 

 attains a maximum elevation of 3955' (see map of hydro- 

 graphic office). The range is separated from the main 

 mass of the peninsula by a wide desert plain. 



vSketch map of the southern half of the California peninsula. Dotted 

 lines mark the trend of ranges and lines of dislocation. 



Of the geology of the range proper we know as yet 

 nothing, but its continuation northward, Cerros Island, is 

 known from the description of Dr. John A. Veatch.* 

 The island is composed of highly metamorphic slates, 



*J. Ross Browne. Resources of the Pacific Slope, p. 143, San Francisco, 

 1869. 



