THE PLEISTOCENE LAKES 



543 



parts of Utah, Oregon, and California ; the recently mapped lakes were 

 distributed through middle and southern Nevada, southern California, 

 and the parts of Arizona and New Mexico that lie in this province. More- 

 over, nearly all parts of the province that are devoid of Pleistocene lake 

 beds have been examined for these features in recent vears. 



Figure 1. — Map of the Pleistocene Lakes in the Basin-anrf-Range Province 



The presence or absence of Pleistocene lakes in a given drainage basin 

 and the size of each lake relative to the size of its basin are conditions 

 controlled by a number of rather complexly interrelated factors, such <is 

 the size of the basin, the permeability or impermeability of its bedrocks. 



