A. C. Peale—Ancient Outlet of Great Salt Lake. 441 
was not only recognized, but well known five years prior to 
Mr. Gilbert’s supposed discovery. On page 202 of the Annual 
Report of the Survey for 1872 * is the following statement by 
Professor F. H. Bradley: ‘The level of the divide between the 
head of Marsh Creek and the Bear River drainage, at Red 
Rock Pass, as ascertained by the party of 1871, indicates that 
this was probably another point of outflow ;” and on the fol- 
lowing page (203) the following sentence in relation to the ter- 
races in Marsh Creek Valley, which extend northward from 
Red Rock Pass: ‘They are on too large a scale, and the valley 
is too wide, to have resulted from merely the drainage of the 
small area of mountains about the head of the stream; and I 
am strongly of the opinion that this must have been at one 
time the channel for a large outflow from the Great Basin.” 
It seems to me that this places the discovery where it belongs 
beyond question. 
It appears also that Mr. Gilbert ignores some of his own 
statements. In his report to Lieutenant Wheeler,t he says 
that Professor O. C. Marsh informed him that he had discov- 
ered on the northern shore of the lake an outlet leading to 
Snake River, and in a foot note on the same page says, “ Pro- 
fessor Frank H. Bradley mentions four points of possible out- 
flow from the northeast margins.—(United States Geological 
Survey of the Territories, 1872, p. 202.) 
In the second place, Red Rock Pass was not the outlet of Lake 
Bonneviille. 
Lake Bonneville extended over the whole of Marsh Creek 
Valley and its outlet was more than forty miles farther north 
than Mr. Gilbert ever went. Red Rock Pass was only a point 
ancient lake outflowed.” This sentence implies that he went 
into Marsh Creek Valley. Had he done so or had he even 
ascended one of the numerous points that command the view 
. Vi 
lake. (Report United States Geological Survey for 1871, p. 19.) ie 
ee Sixth 5 gedee Report of the United States Geological Survey of the Territories 
1872, Washington, 1873. 
Report upon Geographical and Geological Explorations west of the 100th 
inte in nee of ee Lieutenant Geo. M. Wheeler. Vol. iii, Geology. 
Washington, 1875, p. 91. 
