pbindle.] WORK OF GEOLOGICAL SURVEY. 13 
preek region, hay is put up for use during the winter months, and in 
portions of the Xanana Valley grass grows luxuriantly. One of the 
interesting sights of the trip was that of a bunch of cattle uear the 
Tanana resting lazily in the warm sunshine of a September day sur- 
rounded by an abundance of good grass. 
WORK OF THE SURVEY. 
PREVIOUS WORK. 
The Fortymile, Birch Creek, and Rampart regions were visited 
in 1896 by a survey party consisting of Spurr, Goodrich, and 
Bchrader, the trip resulting in detailed descriptions of the gold-pro- 
ducing areas, an account of the developments that had been made up 
to that time, and sketch maps of the areas traversed." 
In 181)8 Mr. Alfred H. Brooks,'' of the Survey, studied the geog- 
raphy and geology along the Tanana side of the area and noted the 
lithologic resemblances to the gold-bearing rocks of the Fortymile 
and Birch Creek regions, described by Spurr. The valley of the 
Tanana was mapped, and in the same year another party, led by Mr. 
E. C. Barnard, made a map of the Fortymile region on a scale of 
about -1 miles to the inch (PI. VII ) . 
The trip of the Peters and Brooks party c of the Survey, in 1<S ( ,M), 
gave an opportunity for comparing the geology of this area with that 
of the country south of the Tanana, and to note the economic devel- 
opments that had been made in the Fortymile region since the visit 
of the Spurr party. 
In 1902 Mr. Collier studied the geology along the Yukon with spe- 
cial reference to the occurrence of coal, and investigated the gold 
placer diggings on Glenn Creek in the Rampart region.^ During the 
same season the Brooks party from the Mount McKinley region 
crossed the Tanana at Tortella and studied a section of the area from 
this river to Rampart. e 
work of 1903. 
Exploitation has been steadily carried forward since Spurr's inves- 
tigations, and the camps have continued to develop in spite of the 
" Spurr, J. E., Geology of the Yukon gold districts, Alaska : Eighteenth Ann. Rept. 
p. S. Geol Survey, pt. 3, 1898, pp. 87-392. 
*> A reconnaissance in the Tanana and White river basins, Alaska, in 1898: Twentieth 
Ann. Rept. U. S. Geol. Survey, 1900, pt. 7. pp. 4l'5-4!)4. 
c Brooks, Alfred H., A reconnaissance from Pyramid Harbor to Eagle City, Alaska, 
including a description of the copper deposits on the Copper and Tanana rivers: Twenty- 
first Ann. Rept. TT. S. Geol. Survey, pt. 2, 1900, pp. 331-391. 
''Collier, Arthur J.. The Glenn Creek gold mining district. Alaska: Bull. U. S. Geol. 
Survey No. 213, 1903. pp. 49-50; The coal resources of the Yukon. Alaska: Bid. U. S. 
Geoi. Survey No. 218, 1903. 
' Brooks. Alfred II.. An exploration in the Mount McKinley region, Alaska : Prof. Paper 
(J. S. Geol. Survey No. — (in preparation). 
