REVIEWS 571 



Coleman, pp. 163-79; "Bog Iron on English River," by E. S. Moore, 

 pp. 180-95; "Geology of Onaman Iron Range Area," by E. S. Moore, 

 pp. 196-253; "Iron Formation of Woman River Area," by R. C. Allen, 

 pp. 254-62; "Lake Abatibi Area," by M. B. Baker, pp. 263-83; "Lake 

 Ojibway; Last of the Great Glacial Lakes," by A. P. Coleman, pp. 284-93; 

 "Classification and Nomenclature of Ontario Drift," by A. P. Coleman, pp. 

 294-97. 



E. R. L. 



The Yakutat Bay Region, Alaska. U.S. Geological Survey Pro- 

 fessional Paper 64. 1909. 

 Physiography and Glacial Geology. By Ralph S. Tarr; and 

 Areal Geology, by Ralph S. Tarr and Bert S. Butler. 183 

 pages. 

 Yakutat Bay lies about forty miles southeast of Mount St. Elias, and 

 is the only break in a straight coastline of about three hundred miles. To 

 the west is the great Malaspina Glacier, while numerous large glaciers 

 occupy the region about the head of the bay. Of these the Hubbard 

 Glacier is probably the finest example of a tidal glacier on the North 

 American continent. The mountain region northward from the bay is 

 described as a vast snow-covered area from which hundreds of angular 

 peaks project, while the valleys are flooded with ice, giving rise to an ice 

 drowned topography, from which valley glaciers extend toward and in 

 some cases to the sea. The condition is so different from normal valley 

 glaciation that a special name, "through glacier," is. proposed. The glaciers 

 are in a stage of retreat which has apparently been in progress for a con- 

 siderable length of time. A marked change, in the nature of paroxysmal 

 thrust affected at least four of the glaciers, mainly in the ten months pre- 

 ceding June 1906. As interpreted by the author, this was probably due 

 to the shaking-down of great avalanches of snow onto the upper part of 

 the glaciers by the earthquake of 1899. The description of the glaciers, 

 glacial erosion, and glacial deposits takes up the greater part of the volume. 

 The rocks of the district are almost barren of fossils and have been 

 subjected to profound disturbance. Four distinct groups are recognized, 

 a complex series of granites, gneisses and schists, the Yakutat group of 

 conglomerate shale and sandstone, probably Mesozoic, Tertiary sandstones, 

 shales and clays, and glacial gravels. 



E. R. L. 



