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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
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.
Filter Total Items: 83895
Geology of the upper Matanuska valley, Alaska, with a section on the igneous rocks
No abstract available.
Authors
Stephen Reid Capps, John Beaver Mertie
Large springs in the United States
What are the largest springs in the United States, how much water do they discharge, and what geologic conditions produce them are questions of much popular interest and considerable scientific and economic importance. Yet the information in regard to large springs has been so widely scattered and so difficult to interpret that most people have only very vague notions on the subject. The present p
Authors
Oscar Edward Meinzer
Manganese-bearing deposits near Lake Crescent and Humptulips, Washington
The Crescent mine, situated a short distance west of Lake Crescent, in the Olympic Mountains of Washington, yields an unusually high grade of manganese ore, which is suitable for making steel. Several manganiferous lodes of promising appearance have been found in the same area, and some near Humptulips, on the south side of the mountains. These and deposits on Skokomish River and at other places i
Authors
J. T. Pardee
Mineral resources of Alaska, report on progress of investigations in 1925. Mineral industry of Alaska in 1925 and administrative report
No abstract available.
Authors
Fred Howard Moffit
Mineral resources of Alaska, report on progress of investigations in 1925. The Toklat-Tonzona River region. Geologic investigations in northern Alaska
No abstract available.
Authors
S. R. Capps, P. S. Smith
Mineral resources of Alaska: Report on progress of investigations in 1925
No abstract available.
Authors
Fred H. Moffit
Mineral resources of the United States, 1923: Part I - Metals
No abstract available.
Authors
Frank James Katz
Organic precipitation of metallic copper: Chapter C in Contributions to economic geology (short papers and preliminary reports), 1927: Part I - Metals and nonmetals except fuels
Spongy masses of native copper, found in a bog near Cooke, Mont., are believed to have been precipitated by organic matter. Their occurrence and field relations are such as sharply limit speculations concerning their origin.
Authors
T. S. Lovering
Phosphate rock in the Three Forks-Yellowstone Park region, Montana: Chapter G in Contributions to economic geology (short papers and preliminary reports), 1927: Part I - Metals and nonmetals except fuels
The region described is about 7,000 square miles in area. It includes most of Gallatin and Madison Counties, in Montana, and some contiguous parts of Idaho and Wyoming. Within it are several broad fertile valleys and a number of prominent mountain ranges. A considerable part is underlain by a bed of phosphate rock which occurs in the Phosphoria formation, of Permian age, and is elevated to the sur
Authors
D. Dale Condit, E.H. Finch, J. T. Pardee
Plan of Clark Fork below Horse Creek, Montana, Pend Oreille Lake and River to Albeni Falls, Idaho: Pack River below Great Northern Railway Crossing
No abstract available.
Authors
W.F. Chenault
Plants as indicators of ground water
Perhaps the most outstanding feature of the flora of the desert is its relation or lack of relation to the water table. On the one hand are the plants which are adapted to extreme economy of water, which depend on the rains that occur at long intervals for their scanty water supplies, and which during prolonged periods of drought maintain themselves in a nearly dormant condition. These plants are
Authors
Oscar Edward Meinzer