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Browse more than 82,000 reports authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.

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The copper deposits of the Clifton-Morenci district, Arizona

The oldest rocks of the Clifton quadrangle are pre-Cambrian granite and quartzitic schists, separated by an important unconformity from the covering Paleozoic strata. The latter comprise a total thickness of 1,500 feet. At the base lie 200 feet of probably Cambrian quartzitic sandstone, succeeded by 200 to 400 feet of Ordovician limestones. About 100 feet of Devonian (?) shale and argillaceous lim
Authors
Waldemar Lindgren

The disposal of strawboard and oil-well wastes

No abstract available.
Authors
Robert Lemuel Sackett, Isaiah Bowman

The drumlins of southeastern Wisconsin (preliminary paper)

No abstract available.
Authors
William C. Alden

The Fairhaven gold placers, Seward Peninsula, Alaska

This manuscript is based on a geologic and topographic reconnaissance survey, made during the summer of 1903, of an important placer-gold district in the northeastern part of Seward Peninsula. The report is accompanied by a reconnaissance map by Mr. D. C. Witherspoon, topographer, under whose directions the field operations were carried out.Surveys were begun in Seward Peninsula in 1899, soon afte
Authors
Fred Howard Moffit

The fluorspar deposits of southern Illinois

No abstract available.
Authors
Harry Foster Bain

The geology of the Perry Basin in southeastern Maine

The geologic examination of the Perry district, in southeastern Maine, was undertaken at the request of the Survey Commission of the State of Maine. During the 1902-3 session of the Maine legislature an effort was made by petitioners resident in Washington County to obtain from the State an appropriation of $10,000 for coal exploration. The resolve proposed contained a ,proviso necessitating an ad
Authors
G. O. Smith, David White

The Gold Placers of the Fortymile, Birch Creek, and Fairbanks Regions, Alaska

No abstract available.
Authors
Louis Marcus Prindle

The hydrology of San Bernardino Valley, California

The San Bernardino basin lies near the eastern end of the valley of southern California.  Under the latter term is included that general lowland area which is definitely limited on the north by the San Gabriel and San Bernardino ranges and on the east by the latter range and the San Jacinto group, but whose southern boundary is irregular and difficult to define.  In this direction there is an inte
Authors
Walter C. Mendenhall

The lead, zinc, and fluorspar deposits of western Kentucky

Geography and distinctive characters. The fluorspar, lead, and zinc deposits that were the subject of the investigations reported in this paper are situated hi Livings ton, Crittenden, and Caldwell, and adjacent portions of Christian, Trigg, and Lyon counties, in western Kentucky, and in the counties immediately across the Ohio River, in the extreme southern portion of Illinois. This area, constit
Authors
E. O. Ulrich, W.S.T. Smith

The lignite of North Dakota and its relation to irrigation

No abstract available.
Authors
Frank Alonzo Wilder

The normal distribution of chlorine in the natural waters of New York and New England

No abstract available.
Authors
Daniel Dana Jackson

The origin of certain place names in the United States (second edition)

No abstract available.
Authors
Henry Gannett