Publications
Products (journal articles, reports, fact sheets) authored by current and past scientists are listed below. Please check the USGS Pubs Warehouse for other USGS publications.
Filter Total Items: 1913
A Study of Roman mining and metallurgy and their environmental consequences at Plasenzuela, Extremadura, Spain A Study of Roman mining and metallurgy and their environmental consequences at Plasenzuela, Extremadura, Spain
No abstract available.
Authors
Robert G. Schmidt, Cathy M. Ager, Juan Gil Montes
Digital geologic map database of the Payette National Forest and vicinity, Idaho Digital geologic map database of the Payette National Forest and vicinity, Idaho
The geology of the Payette National Forest and vicinity, Idaho (Fig. 1), was mapped and compiled by Karen Lund between 1992 and 1996. The geologic data for the digital map are from original mapping as well as compilation by Lund of numerous sources of published and unpublished geologic maps that are cited in the section 'Bibliography of Geologic Map Sources.' The geology was compiled...
Authors
Karen Lund, P. D. Derkey, T. R. Brandt, J.R. Oblad
Future of gas hydrate research Future of gas hydrate research
Methane hydrates are ice‐like inclusion compounds, in which every volume of hydrate can contain as much as 180 volumes (STP) of gas.The amount of methane in natural gas hydrates is twice the total recoverable fossil fuel reserve. Because of their natural abundance in oceans and permafrost, hydrates have become an exciting national and international research issue. The movement of the gas...
Authors
D.E. Sloan, P.G. Brewer, C. K. Paull, Timothy S. Collett, W. Steven Holbrook, Keith A. Kvenvolden
Potassium-calcium decay system Potassium-calcium decay system
Potassium has three isotopes (see Potassium); potassium-40 ( 40K) is radioactive and decays to both calcium-40 ( 40Ca) and argon-40 ( 40Ar). The combined half-life of 40K is 1.25 billion years. The branched decay scheme of 40K is shown in Figure P33. It decays by β- decay to 40Ca and to 40Ar by both electron capture and positron decay (see Potassium-argon decay system). Although 89.52%...
Authors
Brian D. Marshall
Dating methods Dating methods
One of the greatest contributions of geochemistry to man's knowledge of the Earth and solar system has been the development and application of chemical and isotopic techniques used to measure the passage of time. Rates of geologic processes, rates of biological evolution, and contemporaneity of past events all depend on accurate ages of geologic materials. Many geochemical methods have...
Authors
Brian D. Marshall
Defining models and measuring aggregate quality for gravel deposits of the Front Range Urban Corridor, Colorado Defining models and measuring aggregate quality for gravel deposits of the Front Range Urban Corridor, Colorado
No abstract available.
Authors
David A. Lindsey, William H. Langer
Neoproterozoic(?) to Pennsylvanian inner-shelf, miogeoclinal strata in Sierra Agua Verde, Sonora, Mexico Neoproterozoic(?) to Pennsylvanian inner-shelf, miogeoclinal strata in Sierra Agua Verde, Sonora, Mexico
No abstract available.
Authors
John H. Stewart, Forrest G. Poole, Anita G. Harris, John E. Repetski, Bruce R. Wardlaw, Bernard L. Mamet, J. M. Morales-Ramirez
Distinguishing Grenvillian basement from pre-Taconian cover rocks in the Northern Appalachians Distinguishing Grenvillian basement from pre-Taconian cover rocks in the Northern Appalachians
Distinguishing Grenvillian basement rocks from pre-Taconian cover sequences in the Appalachians is a first-order problem essential for accurate structural interpretations. The Cavendish Formation in southeastern Vermont presents a classic example of this problem. Doll and others (1961) showed the Cavendish Formation as younger than the Middle Proterozoic Mount Holly Complex but older...
Authors
Paul M. Karabinos, John N. Aleinikoff, C. Mark Fanning
A late Frasnian (Late Devonian) radiolarian, sponge spicule, and conodont fauna from the Slaven Chert, northern Shoshone Range, Roberts Mountains allochthon, Nevada A late Frasnian (Late Devonian) radiolarian, sponge spicule, and conodont fauna from the Slaven Chert, northern Shoshone Range, Roberts Mountains allochthon, Nevada
Co-occuring conodonts, radiolarians, and sponge spicules from the type locality of the Slaven Chert, northern Shoshone Range, Nevada, indicate that the radiolarian and sponge spicule assemblage described herein correlates with the Late rhenana conodont Zone (late Frasnian). The moderately well preserved radiolarians are the first Frasnian-age fauna described from the Western Hemisphere...
Authors
S. Q. Boundy-Sanders, Charles Sandberg, B.L. Murchey, A. G. Harris
Environmental signatures of mineral deposits and areas of regional hydrothermal alteration in Northeastern Hungary Environmental signatures of mineral deposits and areas of regional hydrothermal alteration in Northeastern Hungary
No abstract available.
Authors
L. Odor, Richard B. Wanty, I. Horvath, U. Fugedi
Spectroscopy of rocks and minerals and principles of spectroscopy Spectroscopy of rocks and minerals and principles of spectroscopy
Spectroscopy is the study of light as a function of wavelength that has been emitted, reflected or scattered from a solid, liquid, or gas. In this chapter I will primarily discuss the spectroscopy of minerals, but the principles apply to any material. No single chapter can cover this topic adequately, and one could argue, not even a single book. Thus, in some ways, this chapter may fall...
Authors
Roger N. Clark
Distribution of altered rock material in the Kerber Creek drainage basin, Saguache County, Colorado Distribution of altered rock material in the Kerber Creek drainage basin, Saguache County, Colorado
No abstract available.
Authors
K.E. Livo, Ken Watson, D. H. Knepper, Susanne Hummer-Miller