14 COAL EESOURCES OF THE YUKON. [no. 218. 
mineral resources of the region, but no investigations were made 
by a geologist until 1888, when Dawson a visited the upper basin. In 
the following } 7 ear McConnelP extended the observations of Dawson 
as far as Fort Yukon by his trip down the Porcupine. Further 
information was obtained by Russell c in 1890, who ascended the full 
length of Yukon and Lewes rivers, and by Hayes, d who entered the 
basin by way of the Hootalinqua and left it hy the White River 
Valley, in 1891. Somewhat more s3 T stematic work was begun by a 
trip made by Spurr, Goodrich, and Schrader, e who in 1896 made a 
rapid reconnaissance of the river from Chilkoot Pass to Nulato. The 
result of their work led to the publication of the first geologic map of 
a section of the Yukon, together with suggestions for the correlation 
of the work of all the previous investigators of the region. Spurr's 
report contains the first attempt at a determination of the strati- 
graphic succession in the basin of the Yukon, and in the accompan} 7 - 
ing table his nomenclature has been accepted as far as possible. In 
1898 Spurr f made a reconnaissance in southwestern Alaska, and in the 
map accompanying his report embodied the results of his previous 
investigations on the lower Yukon. In the same year Brooks'/ made 
a reconnaissance of White and Tanana rivers. In 1899 Schrader h 
studied the geology of Chandlar and Koyukuk rivers, and thus 
extended the knowledge of the stratigraphy from the Yukon north- 
ward, while Brooks' made a reconnaissance which extended to the 
Yukon at Eagle. In 1901 Mendenhall' made a trip from Fort 
Hamlin to Kotzebue Sound, and the result of his work throws further 
light on the geology north of the Yukon. In 1903 Brooks 1 ' briefly 
summarized all of the available information regarding the stratig- 
raphy of the Mesozoic and Tertiary terranes of the Yukon. During 
the last few years the Canadian geologists have been actively at work 
a Dawson, George M., Report on an exploration in the Yukon district, N. W. T., and adjacent 
northern portion of British Columbia: Geol. and Nat. Hist. Surv. Canada, Ann. Rept., new series, vol. 
3, pp. 1B-277B. 
b McConnell, R. G., Report on an exploration in the Yukon and Mackenzie river basins, N\ W. 'I'.; 
Geol. and Nat. Hist. Surv. Canada, new series, vol. 4, 1888-89, pp. 134D-145D. 
c Russell, I. C, Notes on the surface geology of Alaska: Bull. Geol. Soc. America, vol. 1, 1889, 
pp. 99-102. 
d Hayes, C. Willard, An expedition through the Yukon district: Nat. Geog. Mag., vol. 4, 1892, 
pp. 117-159. 
e Geology of the Yukon gold district: Eighteenth Ann. Rept. IT. S. Geol. Survey, pt. 3, 1898, pp. 
87-392. 
/Spurr, J. E., A reconnaissance in southwestern Alaska in 1898: Twentieth Ann. Rept. U. S. Geol. 
Survey, pt. 7, 1899, pp. 31-264 and maps 4-14. 
9 Brooks, Alfred H., A reconnaissance in the Tanana and White river basins, Alaska, in 1898: 
Twentieth Ann. Rept. U. S. Geol. Survey, pt. 7, 1899, pp. 425-494. 
h Schrader, F. C, Preliminary report on a reconnaissance along the Chandlar and Koyukuk rivers, 
Alaska, in 1899: Twenty-first Ann. Rept. U. S. Geol. Survey, pt. 2, 1900, pp. 441-486. 
i Brooks, Alfred H., A reconnaissance from Pyramid Harbor to Eagle City, Alaska: Twenty-first 
Ann. Rept. U. S. Geol. Survey, pt. 2, 1900, pp. 331-391. 
J Mendenhall, W. C, Reconnaissance from Fort Hamlin to Kotzebue Sound, Alaska: Prof. Paper 
U. S. Geol. Survey No. 10, 1902. 
fc Brooks, Alfred H., Coal resources of Alaska: Twenty-second Ann. Rept. U. S. Geol. Survey, pt. 3. 
1902, pp. 515-571. 
