6 5 6 



THE PLEISTOCENE PERIOD 



y V A *'*.' ' MlFr* 



MAP OF 



LAKE BONNEVILLE 



Fig. 538. Map of Lake Bonneville, showing also the areas of basalt (black 

 areas), some of which are Quaternary, the lines of recent faulting (full black lines), 

 and the deformation of the basin (broken lines). The numbers on the broken lines 

 show the height of the Bonnev ille shore line above the level of the present Great 

 Salt Lake, at different places. (Gilbert, U. S. Geol. Surv.) 



