120 



GEOLOGICAL HISTOEY OF LAKE LAHONTAX. 



instance before iis, the gravel forming- the embankment was brought by 

 shore currents from the north, along the east side of Winnemucca Valley, 

 and deposited, when tlie current was deflected from the shore, so as to build 

 the structure still remaining. This is a remarkably uniform embankment. 



Fig. 19. — Gravtl embaokment at south t-nd of "Winnemucca Lake. Nevada. 



about 250 feet liigh, wliich has all the features of an artificial structure in- 

 tended to dam the valley of Winnemucca Lake. Its western end does not 

 reach quite to the west shore of the strait, and since recession of the waters 

 in which it was formed it has been truncated by the erosion of the branch 

 of the Truckee River which flows into Winnemucca Lake. A portion of 

 the section exposed by the removal of the end of the embankment is accu- 

 rately shown in the following diagram. 



fc--.: 



Mssm 



Scale of feet— vortical ami hori/.ontal the same. 

 Fig. 20.— Section of gravel embankment at south end of Winnemucca Lake, Nevada. 



