on 
258 G. K. @ilbert—Ancient Outlet of Great Salt Lake. 
cumstances asserts its supremacy and clearly marks the longest 
lingering of the water. It has been called the “ Provo Beach,” 
and it runs about 365 feet below the Bonneville Beach. When 
the discharge of the lake began, its level was that recorded by 
the Bonneville Beach. The outflowing stream crossed the 
unconsolidated gravels that overlay the limestone at Red Rock 
ass, and cut them away rapidly. The lake surface was low- 
ered with comparative rapidity until the limestone was exposed, 
but from that time the progress was exceedingly slow. Fora 
long period the water was held at nearly the same level, and 
the Provo Beach was produced. Then came the drying of the 
climate, and the outflow ceased ; and slowly, with many linger- 
ings, the lake has shrunk to its present size. 
In Dr. Hayden’s Preliminary Report of the field work of his 
Survey for the season of 1877, noticed on page 56 of the cur- 
geological observations, but it is to be hoped that the idea will 
not be advocated in that gentleman’s report. The divide 
referred to is near Malade City, and separates Malade Valley 
from Marsh Valley. The Bonneville Beach is well marked all 
about Malade Valley, and nowhere more strongly than in the 
afforded passage to the water. 
Eilon who visited the locality in 187 2, expressed the half 
formed opinion that it had been a point of outflow, but he de- 
