ransome.] LITERATURE RELATING TO THE REGION. 15 
BIBLIOGRAPHY. 
Rhoda, F. Report on the topography of the San Juan country : Hay- 
den Survey Report for 1874, p. 451. 
Contains a few notes on early history of the region. 
ENDLICH, F. M. Report on the San Juan region: Hayden Survey 
Report for 1874, pp. 185-240. 
Contains brief notes on the mines as developed at that time. He divides the 
veins into two systems— one striking nearly northwest and southeast, and the 
other nearly northeast and southwest. The veins were formed at the close of the 
Cretaceous or beginning of the Tertiary. 
Endlich, F. M. Report on the San Juan region: Hayden Survey, 
Annual Report for 1875, pp. 170-191. 
General notes on geology. 
Endlich, F. M. Report on the San Juan region: Hayden Survey, 
Annual Report for L876, pp. 120-121. 
Brief notes on mines and ores. 
FOSSETT, F. Colorado. Denver, 1876. 2d ed., New York, 1880. 
•Contains much useful data, chiefly of a historical character, in regard to the 
early settlement and development of the San Juan region. 
Koenig, G. A. On alaskaite, a new member from the series of bismuth 
sulphosalts: Proc. Am. Philos. Soc., Vol. XIX, 1881, pp. 472-477. 
Describes alaskaite from Alaska mine,-Poughkeepsie Gulch. 
Comstock, T. B. Notes on the geology and mineralogy of San Juan 
County, Colorado: Trans. Am. Inst, Min. Eng., Vol. XI, 1882-83, 
pp. 165-191. 
Discusses chiefly the character and distribution of the veins. Accompanied by 
a sketch map. 
Cross, Whitman. A list of specially noteworthy minerals of Colo- 
rado: Proc. Colo. Sri. Soc. Vol. 1. 1883-84, pp. 134-144. 
Refers to occurrence of various minerals in the San Juan region. 
Schwarz, T. E. Remarks on occurrence of ore in mines near Silver- 
ton: Proc. Colo. Sei. Soc., Vol. I, 1883-84, p. 132. 
Describes principal deposits of the Red Mountain district. 
Hillebrand, \Y . F. Mineral ogical notes: Proc. Colo. Sci. Soc, Vol. 
I, 1883-84, pp. 121-123. 
Describes zinkenite from Brobdignag mine. 
Hillebrand, W. F. On zunyite and guitermanite, two new minerals 
from Colorado: Proc. Colo. Sei. Soc, Vol. I, 1883-84, pp. 124-131. 
Hills, R. C. Kaolinite from Red Mountain, Colorado: Am. Jour. 
Sei., 3d ser., Vol. XXVII, 1884, p. 472. 
Describes kaolinite from National (American) Belle mine. 
Hills, R. C. Extinct glaciers of the San Juan Mountains, Colorado: 
Am. Jour. Sci., 3d ser., Vol. XXVII, 1884, pp. 391-396. Also 
Proc Colo. Sci. Soc, Vol. I, 1883-84, pp. 39-46. 
Notes on extent and location of former glaciers of San Juan region. 
