374 C. R. KEYES OROGRAPHIC ORIGIN OE LAKE BONNEVILLE 



(10) Lake Bonneville is not an anomalous phenomenon among desert 

 features, notwithstanding the fact that it possessed antithetical relations 

 to its climatic surroundings. It is merely a special phase of a large 

 through-fxowing river that ^ as jat not quite large enough to corrade even 

 a narrow canyon through the mountainous harrier which chanced to rise 

 athwart its path. AMth no outlet and undiminished augmentation to its 

 ^■olunle, a lake was formed, tlie waters of which rose and spread uutil 

 evaporation and inflow reached equilibrium. AVhen later the chief tri1)ii- 

 tary Avas diverted by lava ilows, the le\'el of the lake rapidly fell uaitil 

 equilibrium was again hnally established with the inflow of the remain- 

 ing tributaries, as is seen in the present Great Salt Lake. 



