30 
145 Crawford (J. J.). Thirteenth Annual Eeport of the State Min- 
eralogist for the two years ending September 15, 1896 
[California]. Sacrameuto, Cal., 1896, 726 pp. 
Contains notes on mines of the several counties of the State, yielding 
antimony, lead, asphalt, borax, chromic iron, coal, copper, gold, gypsum, 
iron, magnesite, manganese, mineral springs, natural gas, petroleum, 
quicksilver, silver, structural materials, and miscellaneous products. 
116 Crosby (William O.). Englaeial drift. 
Am. Geol., vol. xvii, pp. 203-234, 1896. 
Discusses the early history of the Pleistocene ice sheet, the basal rela- 
tions of a sedentary ice sheet, the relations of englaeial drift to modi- 
fied drift, and the evidences of transportation. Compares the Pleistocene 
ice sheet with modern glaciers. 
117 Englaeial drift. 
Tech. Quart., vol. ix, pp. 116-144, 1896. 
148 Mr. Bonve's | Thomas Tracy Bouvej work in geology and 
mineralogy. 
Boston Soc. Nat. Hist., Proc, vol. xxvii, pp. 236-239, 1896. 
119 Cross (Whitman). Geology of Silver Cliff and the Eosita Hills, 
Colorado. 
U. S. Geol. Surv., 17th Ann. Kept., Part II, pp. 269-403, pis. xxv-xxxvi, 
1896. 
Describes the geology and geologic relationships of the regions and 
the petrographic characters, occurrence and distribution of the gneiss, 
granite, dike rocks, and volcanic series. Presents a geologic map of the 
region. See Emmons (S. F.) No. 200. 
150 Geology of the Cripple Creek gold mining district, Colorado. 
Read before the Colorado Scientific Society, in Denver, Colo., June 
1, 1894, 18 pp. 
Describes the general geology of the region and the occurrence and 
characters of the volcanic rocks. Discusses the relationships of the 
mineral deposits to the rock masses. 
151 Igneous rocks of the Telluride district, Colorado. 
Read before the Colorado Scientific Society, in Denver, Colo., Sept. 7, 
1896, 10 pp. 
Describes the general character and distribution of the igneous rocks 
and the occurrence of diorite stocks and of intrusive rocks in the Cre- 
taceous shales. Includes description of the volcanic series of the west- 
ern San Juan district. 
152 The San Miguel formation [Colorado]. 
Read before the Colorado Scientific Society, in Denver, Colo., Sept. 7, 
1896, 7 pp. 
Describes the character, relationships, and distribution of the forma- 
tion, and discusses its Eocene or Upper Cretaceous age. 
153 Emmons (S. F.), and Eldridge (G. H.). Geology of the Den- 
ver Basin in Colorado. 
See Emmons (S. F.), Cross ( W.), and Eldridge (G. H.). No. 202. 
