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: 1954
Late Devonian icriodontid biofacies models and alternate shallow-water conodont zonation Late Devonian icriodontid biofacies models and alternate shallow-water conodont zonation
Recognition of differences in the habitats, apparatuses, and ranges of Late Devonian Icriodus and Pelekysgnathus permits refinement of their biofacies interpretations and construction of an alternate icriodontid zonation. Icriodus is a euphotic genus that predominated in most environments during the early Late Devonian (Frasnian) but died out during the early Famennian. Its apparatus...
Authors
Charles Sandberg, Roland Dreesen
Spectral properties of ice‐particulate mixtures and implications for remote sensing: 1. Intimate mixtures Spectral properties of ice‐particulate mixtures and implications for remote sensing: 1. Intimate mixtures
The spectral properties of water ice-particulate mixtures are studied for the purpose of deriving the ice and particulate abundances from remotely obtained spectra (particulates referring to nonicy materials in the form of grains). Reflectance levels and ice absorption band depths are a complex function of the single scattering albedo of the particulates embedded in the ice. The ice...
Authors
Roger N. Clark, Paul G. Lucey
Reflectance spectroscopy: Quantitative analysis techniques for remote sensing applications Reflectance spectroscopy: Quantitative analysis techniques for remote sensing applications
Several methods for the analysis of remotely sensed reflectance data are compared, including empirical methods and scattering theories, both of which are important for solving remote sensing problems. The concept of the photon mean optical path length and the implications for use in modeling reflectance spectra are presented. It is shown that the mean optical path length in a particulate...
Authors
Roger N. Clark, T. L. Roush
Magnetic models of crystalline terrane; accounting for the effect of topography Magnetic models of crystalline terrane; accounting for the effect of topography
Igneous rocks commonly have large magnetic susceptibilities so that high topographic relief in crystalline terrane can produce significant anomalies in aeromagnetic surveys. Topographic anomalies are particularly significant in relatively undeformed volcanic terrane because young volcanic rocks generally have large natural remanent magnetizations as well as large susceptibilities. These...
Authors
Richard J. Blakely, V. J. Grauch
Interaction of subsurface brines with oxygenated meteoric water, Ray Point Uranium District, South Texas, USA Interaction of subsurface brines with oxygenated meteoric water, Ray Point Uranium District, South Texas, USA
No abstract available.
Authors
Martin B. Goldhaber, Richard B. Wanty, J.R. Chatham, R. L. Reynolds, D. Langmuir
Rb-Sr, Sm-Nd, K-Ca, O, and H isotopic study of Cretaceous-Tertiary boundary sediments, Caravaca, Spain: evidence for an oceanic impact site Rb-Sr, Sm-Nd, K-Ca, O, and H isotopic study of Cretaceous-Tertiary boundary sediments, Caravaca, Spain: evidence for an oceanic impact site
Isotopic ratios and trace element abundances were measured on samples of Ir-enriched clay at the Cretaceous-Tertiary boundary, and in carbonate and marl from 5 cm below and 3 cm above the boundary. Samples were leached with acetic acid to remove carbonate, and with hydrochloric acid. Leachates and residues were measured. The Sr, Nd, O and H isotopic compositions of the boundary clay...
Authors
D.J. DePaolo, F.T. Kyte, B.D. Marshall, J. R. O’Neil, J. Smit
Proterozoic zircon from augen gneiss, Yukon-Tanana Upland, east-central Alaska Proterozoic zircon from augen gneiss, Yukon-Tanana Upland, east-central Alaska
U-Th-Pb analyses of zircons from an ortho-augen gneiss body in the Yukon-Tanana Upland of east-central Alaska yield strong evidence for the presence of early Proterozoic material in this area. U-Pb data define a chord that intersects concordia at about 2,300 and 345 m.y. We consider two interpretations: (1) the protolith was intruded during the Proterozoic and was subsequently...
Authors
John N. Aleinikoff, Cynthia Dusel-Bacon, Helen L. Foster, Kiyoto Futa
Stratigraphic and economic significance of Mississippian sequence at North Georgetown Canyon, Idaho Stratigraphic and economic significance of Mississippian sequence at North Georgetown Canyon, Idaho
The Mississippian sequence exposed at North Georgetown Canyon, Idaho is newly recognised as a facies belt, which adds to knowledge of Mississippian stratigraphy and petroleum geology in the Overthrust belt of Idaho, Wyoming, and Utah. In the newly recognized facies belt in the Aspen Range, the Madison Group is represented by the Lodgepole Limestone and Mission Canyon Limestone. The...
Authors
W.J. Sando, Charles Sandberg, R.C. Gutschick
Chemical analyses of samples of rock, minus-0.25-mm stream sediment, and nonmagnetic heavy-mineral concentrate, Mokelumne Wilderness and adjacent RARE II further planning areas, California Chemical analyses of samples of rock, minus-0.25-mm stream sediment, and nonmagnetic heavy-mineral concentrate, Mokelumne Wilderness and adjacent RARE II further planning areas, California
No abstract available.
Authors
Maurice A. Chaffee, E.H. McKee, R. H. Hill, W. S. Speckman, S. J. Sutley
Analyses of rocks and stream sediments from the Blue Joint Wilderness study area, Ravalli County, Montana, and the Blue Joint roadless area, Lemhi County, Idaho Analyses of rocks and stream sediments from the Blue Joint Wilderness study area, Ravalli County, Montana, and the Blue Joint roadless area, Lemhi County, Idaho
No abstract available.
Authors
E. L. Mosier, W. M. Rehn, Karen Lund, C. D. Holloway, B. W. Coxe, R. O. Yeoman
Mahd adh Dhahab: Precambrian epithermal gold deposit in Saudi Arabia Mahd adh Dhahab: Precambrian epithermal gold deposit in Saudi Arabia
No abstract available.
Authors
Robert W. Luce, James R. O’Neil, Robert O. Rye