REVIEWS 427 



and these soils almost universally contain high percentages of lime and potash, 

 because not subject to the leaching process which affects the soils of the humid 

 regions. 



RiTTER, William E. Subsidence of Santa Catalina Island in Recefit Geo- 

 logical Times. Science, N. S., Vol. XIV, pp. S7S-7< 1901. 

 A submerged cobblestone beach three quarters of a mile to a mile out to sea from 



the present shore is cited in proof of the subsidence. 



Salisbury, R. D. Glacial Work in the Western Mountains in igoi . Jour.. 

 Geol., Vol. IX, pp. 718-31, igoi. 



Reports results of investigations by several parties in northwestern Montana both 

 east and west of the Rocky mountains; in the mountains of New Mexico, and in the 

 Wasatch mountains. 



The work east of the Rockies in Montana determined the limits of the northeast- 

 ern ice-sheet and developed evidence concerning moraines of fourteen glaciers from 

 the Rocky mountains. The work west of the Rockies was largely given to mapping 

 the moraines of glaciers which extended southward in the lowlands and valleys. 



In the Wasatch the positions of fifty Pleistocene glaciers exceeding one mile in 

 length were determined, as well as traces of smaller glaciers and more than a dozen 

 neve fields. Several of the glaciers reached the shore of Lake Bonneville, and the 

 moraines of at least three of them are partially buried by the fiuviatile deposits near 

 the shore or possibly by the shore deposits. The altitude necessary to give rise to a 

 glacier in that region was 8,000 to 9,000 feet. The glaciers were more numerous and 

 larger, and the glaciation more vigorous, on the western slope than on the eastern, 

 because of larger catchment basins and heavier snowfall. These mountains afford 

 evidence of two widely separated episodes of glaciation. 



In the New Mexico Rockies an altitude of 11,700 to 12,000 feet was necessary to 

 produce glaciation. At least no evidence was found on peaks of lower altitude,, 

 though the search was not exhaustive. The longest glacier track is seven miles, and 

 extends down to 9,200 feet. 



It was also discovered that the Spanish Peaks of Colorado were once glaciated 

 on their northern slopes. 



Stone, G. H. Note ofi the Extijict Glaciers of New Mexico and Arizona.. 



Science, N. S., Vol. XIV, p. 798, 1901. 



The former occurrence of glaciers on the La Plata and San Juan mountains of 

 southwestern Colorado is referred to, an account of which had previously been pub- 

 lished. The Conejos range of the San Juan in New Mexico was glaciated for only thirty 

 to fifty miles south of the Colorado-New Mexico line. The Sangre de Christo range 

 both in Colorado and New Mexico was glaciated, and glaciation extended nearly to 

 Santa Fe. The farthest southwest that evidences of glaciation were found in Arizona 

 is near Prescott. The ndve of this glacier scarcely rose above 9,000 feet. The occur- 

 rence of glaciation so far south (latitude 34° 30') was probably due to great snowfall 

 owing to proximity to the ocean. It is suggested that glaciers may have existed on 

 the lofty Mogallon mountains of New Mexico and Arizona which had not been exam- 

 ined. 



