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Twenty-seventh annual report of the Director of the United States Geological Survey
Charles D. Walcott
1906, Annual Report 27
During the last fiscal year the character of the work and the organization of the force remained substantially the same as described in the Twenty-sixth Annual Report. Accounts of the work performed in geology and paleontology, chemistry and physics, topography and geography, and hydrography, hydrology, and hydro-economics, as well as...
Zinc and lead deposits of the Upper Mississippi Valley
Harry Foster Bain
1906, Bulletin 294
The zinc and lead mines of the upper Mississippi Valley are in the southwest portion of Wisconsin and in adjacent parts of Illinois mid Iowa. The boundaries of the region are in part indefinite, since sporadic occurrences of the minerals are found outside the mining region proper. It is usual...
Report on progress of investigations of mineral resources of Alaska in 1904
Alfred H. Brooks
1905, Bulletin 259
During the last two years the United States Geological Survey has met the demand of the mining public for early publication of economic results by issuing an annual bulletin entitled "Contributions to Economic Geology." Though these volumes have made no attempt to treat exhaustively any of the subject discussed, and...
The Triassic cephalopod genera of America
Alpheus Hyatt, J.P. Smith
1905, Professional Paper 40
The marine Triassic section of .America is unusually complete, and its thickness compares favorably with that of any other region. All three subdivisions-Lower, Middle, and Upper Triassic--are represented by calcareous deposits, aggregating approximately 4,000 feet in thickness. Of this amount, about 800 feet belong to the Lower Triassic, about 1,000...