Geology, Geophysics, and Geochemistry Science Center

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.

USGS Publications Warehouse

Filter Total Items: 1,640
Publication Thumbnail
Year Published: 1985

A new isostatic residual gravity map of the conterminous United States

In order to display more clearly the gravity anomalies caused by bodies of geologic interest in the crust, a new colored isostatic residual gravity map of the conterminous United States has been prepared using the gravity data set compiled for the Gravity Anomaly Map of the United States (SEG, 1982). The isostatic residual map is based on an Airy-...

Simpson, Robert W.; Jachens, Robert C.; Saltus, Richard W.; Blakely, Richard J.

Publication Thumbnail
Year Published: 1985

Evidence for Quaternary tectonism in the northern Bighorn basin, Wyoming and Montana

Irregularities in the reconstructed gradients of latest Pliocene and Quaternary terraces in the northern Bighorn Basin, northwest Wyoming and south-central Montana, suggest that Quaternary movements have occurred on the Frannie anticline, the Nye-Bowler–Sage Creek fault zone, and the North Pryor fault. This area has been considered tectonically...

Reheis, Marith C.

Publication Thumbnail
Year Published: 1984

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...

Sandberg, Charles; Dreesen, Roland

Publication Thumbnail
Year Published: 1984

Laurel-McGee and Wheeler Ridge Roadless Areas, California

Geochemical sampling and mine and prospect surveys identified small areas in the Laurel-McGee and Wheeler Ridge Roadless Areas in the eastern Sierra Nevada, California, that have probable potential for the occurrence of small deposits of tungsten and (or) base and precious metals. A number of mines and prospects in or near the roadless areas are...

Cosca, Michael A.; Capstick, Donald O.

Publication Thumbnail
Year Published: 1984

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...

Clark, Roger N.; Roush, T. L.

Publication Thumbnail
Year Published: 1984

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...

Clark, Roger N.; Lucey, Paul G.

Publication Thumbnail
Year Published: 1983

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...

Blakely, Richard J.; Grauch, V. J.

Publication Thumbnail
Year Published: 1983

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...

DePaolo, D.J.; Kyte, F.T.; Marshall, B.D.; O'Neil, J.R.; Smit, J.

Publication Thumbnail
Year Published: 1981

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...

Sando, W.J.; Sandberg, Charles; Gutschick, R.C.

Publication Thumbnail
Year Published: 1978

Mahd adh Dhahab: Precambrian epithermal gold deposit in Saudi Arabia

No abstract available.

Luce, Robert W.; O'Neil, James R.; Rye, Robert O.
Mahd adh Dhahab: Precambrian epithermal gold deposit in Saudi Arabia; 1978; OFR; 78-388; Luce, Robert W.; O'Neil, James R.; Rye, Robert O.