SCIENTIFIC BACKGROUND 



187 



RIFT IN DESERT MOUNTAINS, NEAR DALE MINE 



close, although surviving movements along the fault 

 still occasionally take place. These facts are further 

 shown in the accompanying figure and stratigraphic 

 section. 



SECTION OF THE STRATA 

 We beg the indulgence of the reader for introducing 

 to them the following technical section, written in the 

 language by which geologists talk to one another. 

 Translated it reads as follows: 



The Dominguez Range of folded strata was being 

 made in the latter half of Pleistocene time. The rising 

 range created a barrier between the sea and land, 

 against which marine formations were deposited on 

 the seaward side (the Centinella formations) and 

 continental formations, such as the "blue freshwater" 

 clays (the "La Brea Formation") and "playa" stream 

 and "outwash" deposits on the land or interior side. 



