REVIEWS 95 
The Fairbanks and Rampart Quadrangles, Yukon-Tanana Region, 
Alaska, By L. M, PrinptE Bulletin 337, U. S. Geological 
Survey. 
Geology and Mineral Resources of the Controller Bay Region, Alaska, 
By G. C, Martin. Bulletin 335, U. S Geological Survey. 
Mineral Resources of Alaska, 1907. By A, H Brooks and others, 
Bulletin 345, U. S. Geological Survey. 
Following the policy of the Alaska Division of the United States 
Geological Survey of getting the results of its investigations before the 
public as soon as possible, the first bulletin is a concise summary of the 
present knowledge of the geology of the area covered by the topographic 
maps and issued at the time of their completion. Papers by G. C. Covert 
on the water resources of the Fairbanks region and the Rampart gold placer 
region by F. L. Hess are also included. 
The second bulletin, on the other hand, is a detailed study of the coal- 
bearing rocks occurring in the area about Controller Bay and is a final 
report as far as is possible with the slight amount of development that 
has been done in the area. The age of the rocks is determined to be Mio- 
cene, with a possibility of the base of the series extending down into 
Oligocene. The rocks have been greatly disturbed and exact correlation 
made difficult by the lack of good exposures together with the present hazy 
state of our knowledge of the Tertiary of the Pacific Coast. Several ter- 
races and benches indicate extensive recent elevation. 
In the last bulletin is found the administrative report by A. H. Brooks, 
chief of the Alaska Division, together with several short papers by various 
members of the division summarizing present knowledge as to the occur- 
rence and development of deposits of gold, copper, tin, coal, building-stone, 
and marble, together with papers on the methods of prospecting and mining, 
and the water supplies of the principal camps. 
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The Iron Ores of the Iron Spring District, Southern Utah By C.K, 
LeirH and E, C. Harper Bulletin 338, U. S. Geological 
Survey. 
This bulletin describes a small area in the southwestern corner of Utah, 
about 250 miles south of Salt Lake City. Sedimentary rocks of Carbonifer- 
ous, Cretaceous, and Tertiary age have been intruded by large masses of 
andesite that are possibly laccoliths, and, after erosion, subsequent lava- 
