THE PLEISTOCENE OR GLACIAL PERIOD. 



457 



Following this period of aridity, the climatic conditions were such 

 that a large lake was brought into existence; but after enduring for a 



MAP OF 



SHORE TERRACES 



Near Dove Creek, Utah 



By Gilbert Thompson. 



\^V ; 



Pig. 537 — Contour map of the shore terraces of Lake Bonneville, near Dove Creek, 

 Utah, with sketch of same below. (Thompson, U. S. Geol. Surv.) 



time, it disappeared, apparently by desiccation resulting from change 

 of climate. Later, the lake was restored, and its water rose some 

 90 feet higher than before, and found an outlet to the northward. 



