40 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, [bdll.162. 
259 Emmons (Samuel Franklin). Tenmile district special folio, Colo- 
rado. 
U. S. Geol. Surv., Geol. Atlas of the U. S., Folio No. 48, 1898. 
Describes the geographic features, occurrence and character of the 
Archean, Cambrian, Silurian, and Carboniferous strata, recent deposits, 
diorite-porphyries and rhyolites of the region. Discusses the struc- 
tural relations and orographic disturbances and describes the geo- 
graphic and geologic distribution, character, and occurrence of the 
silver-ore bodies. Accompanied by topographic and geologic maps and 
structure sections. 
260 Man of Alaska, showing known gold-bearing rocks, with 
descriptive text containing sketches of the geography, geol- 
ogy, and gold deposits and routes to the gold fields. 
U. S. Geol. Surv. (prepared in accordance with public resolution No. 
3 of the Fifty-fifth Cougress, second session, approved January 20, 1898), 
44 pp. and geologic map, Washington, 1898. 
Review Zeit. fiirprak. Geol., Heft 8, pp. 292-297; Abstracts, Nat. Geog. 
Mag., vol. ix, pp. 139-172, 3 pis. ; Mg. and Sci. Press, vol. lxxvi. pp. 314-315, 
341-342, 370, and 393, 1898. 
260a [Geology of the Aspen mining district, Colorado, Introduc- 
tion.] 
U. S. Geol. Surv., Mon. XXXI, pp. xvii-xxxii, 1898. 
Includes an account of the development of the Aspen mining district 
and the geologic investigations that have been made in the region. 
261 Evans (Nevil N.). Chemical composition of the granite from Pine 
Lake, Ontario. 
Abstract, Science, new ser., vol. viii, p. 82 (^ p.), 1898. 
262 Fairbanks (Harold W.). Geology of a portion of the southern 
coast ranges. 
Jour, of Geol., vol. vi, pp. 551-576, 2 figs., 1898. 
Describes the topographic features, the character and occurrence of 
the Jurassic, Cretaceous, Tertiary, and Pleistocene deposits and of the 
igneous rocks. Discusses the structure and geologic history of the 
region. 
263 The great Sierra Nevada fault scarp. 
Pop. Sci. Mo., vol. lii, pp. 609-621, 7 figs., 1898. 
Discusses the history of the fault scarp along the eastern base of the 
Sierra Nevada range. 
264 Bituminous rock deposits in the vicinity of San Luis Obispo, 
California. 
Mg. and Sci. Press, vol. lxxvi, p. 661, 1 fig., 1898. 
Describes the occurrence of the bituminous rock and discusses its 
origin. 
265 Fairchild (Herman LeRoy). Kettles in glacial lake deltas. 
Jour, of Geol., vol. vi, pp. 589-596, 3 figs., 1898. 
Describes occurrence at Potter, New York, and discusses its origin 
and formation. 
