608 



THE ICE AGE IN NORTH AMERICA. 



38° 30' south, a distance of two hundred and sixty miles. 

 The Central Pacific Eailroad is built through the bed of thig 

 lake for one hundred and sixty five miles, from the vicinity 

 of Golconda to that of Wadsworth. This ancient lake has 

 been carefully surveyed and described by Mr. I. C. Russell, 

 of the United States Geological Survey,* and has been named 



Pig. 155 —Sketch map of the Pacific coast, showing the outlines of the ancient lakes Bon* 

 neville and Lahontan. (Le Conte.) 



* " Third Annual Report of the United States Geological Survey," pp. 19fr- 

 235, and " Monograph XI," 1885. 



