26o Tlic American Geologist. Apni, i904. 
out attempting a more comprehensive survey of all that is known con- 
cerning glaciation in Alaska. 
No considerable descriptions of the Muir glacier, which has been elab- 
orately and usefully studied, nor of the Malaspina ice-sheet and other very 
interesting piedemont glaciers of the country, are therefore given, which 
must be sought elsewhere in the writings of Muir, Wright, Russell, 
Reid, Gushing and others. Nor is the northwestern border of the con- 
tinental Pleistocene ice-sheet and glacial drift sketched or discussed ; 
although the exemption of the greater part of Alaska from that wide 
glaciation of nearly all of the northern half of North America is one of 
its most remarkable problems, doubtless closely connected with the dif- 
ficult questions of the causes of the Glacial period. 
, Much attention is bestowed upon "hanging valleys" and their testi- 
mony for deep valley erosion by glaciers. Their occurrence along the 
fiords, and at the sides of the deep fiordlike passages (used as steamboat 
routes) which divide the mainland of southeast Alaska and British 
Golumbia from its cordon of mountainous islands, is regarded as proof 
that the erosion beneath the debouchures of the tributary hanging val- 
leys was effected by the deeper and more rapidly flowing ice in the cen- 
tral fiord valleys. This view leads the author to conclude that the land 
generally was not greatly uplifted before and during the Ice age, or. at 
least, that the great depths of the fiords cannot be accepted as a dem- 
onstration and approximate measure of pre-Glacial land elevation. 
w. U. 
MONTHLY AUTHOR'S CATALOGUE 
OF AMERICAN GEOLOGICAL LITERATURE 
ARRANGED ALPHABETICALLY. 
BRANNER, J. C. 
Bibliography of the Geology, Mineralogy and Paleontology of Bra- 
zil. (Arch. Nat. Mus., Rio de Janeiro, vol. 12, pp. 115, 1903.) 
CAMPBELL, M. R. 
Conglomerate dikes in southern Arizona. (Am. Geol., vol. 33, pp. 
135-138, plates 4 and 5, Mar., 1904.) 
CARPENTER, F, R. 
Vein formation and the new geology. (Eng. Min. Jour., vol. 77, 
p. 312, Feb. 25, 1904.) 
COLLIER, A. J. 
The coal resources of the Yukon, Alaska. Bull. 21S, U. S. G. S.. 
pp. 71, Map, 6 plates, 1903.) 
COLLINS, H. F. 
A wollastonite rock-mass. (Eng-. Min. Jour., Mar. 3, 1904.') 
