Publications
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Preliminary report on geophysical data in Yavapai County, Arizona
Recently acquired geophysical data provide information on the geologic framework and its effect of groundwater flow and on stream/aquifer interaction in Yavapai County, Arizona. High-resolution aeromagnetic data reflect diverse rock types at and below the topographic surface and have permitted a preliminary interpretation of faults and underlying rock types (in particular, volcanic) that will prov
Authors
V. E. Langenheim, J.P. Hoffmann, K.W. Blasch, Ed DeWitt, Laurie Wirt
Field-trip guide to the geology of the Lexington Reservoir and Loma Prieta areas in the Santa Cruz Mountains, Santa Clara and Santa Cruz Counties, California
This guide contains a road log and five stop descriptions for a field trip in the southern Santa Cruz Mountains. The trip officially begins at the boat dock parking area on Alma Bridge Road near the dam of Lexington Reservoir. Stop 1 involves a walk up the Limekiln Trail to examine a large landslide in serpentinite that frequently takes out the trail. Stop 2 is at Miller Point picnic area along th
Authors
Philip W. Stoffer, Paula Messina
Composition of the Rex Chert and associated rocks of the Permian Phosphoria Formation: Soda Springs area, SE Idaho
This study, one in a series, reports bulk chemical and mineralogical compositions, as well as petrographic and outcrop descriptions of rocks collected from three measured outcrop sections of the Rex Chert member of the Phosphoria Formation in SE Idaho. The three measured sections were chosen from ten outcrops of Rex Chert that were described in the field. The Rex Chert overlies the Meade Peak Phos
Authors
James R. Hein, Brandie McIntyre, Robert B. Perkins, David Z. Piper, James Evans
Interpreting the earthquake source of the Wabash Valley seismic zone (Illinois, Indiana, and Kentucky) from seismic-reflection, gravity, and magnetic-intensity data
Reprocessing of seismic-reflection data reveals new images of upper- to middle-crustal structures beneath the Wabash Valley seismic zone, located north of the New Madrid seismic zone within the seismically active southern Illinois basin. Four intersecting deep seismic profiles (243 km total) indicate an anomalous, 5–10-km-wide zone of dipping reflections and diffractions below the western flank of
Authors
John H. McBride, Thomas G. Hildenbrand, William J. Stephenson, Christopher J. Potter
Publications of Western Earth Surface Processes Team 2001
The Western Earth Surface Processes Team (WESPT) of the U.S. Geological Survey (USGS) conducts geologic mapping and related topical earth-science studies in the Western United States. This work is focused on areas where modern geologic maps and associated earth-science data are needed to address key societal and environmental issues, such as ground-water quality, landslides and other potential geo
Authors
II Powell, R. W. Graymer
Digital version of "Open-File Report 92-179: Geologic map of the Cow Cove Quadrangle, San Bernardino County, California"
This is a digital map database version of a previous printed geologic map, U.S. Geological Survey Open-File Report 92–179. The original paper map has been faithfully reproduced as a geologic map database for use in a GIS, and thus does not contain updated geologic information for the map area. This publication consists of three parts:
1. Documentation in the form of a this publication's Open File
Authors
Howard G. Wilshire, David R. Bedford, Teresa Coleman
Digital version of "Open-File Report 92-183: Geologic map of the Granite Spring Quadrangle, San Bernardino County, California"
This is a digital map database version of a previous printed geologic map, U.S. Geological Survey Open-File Report 92–183. The original paper map has been faithfully reproduced as a geologic map database for use in a GIS, and thus does not contain updated geologic information for the map area. This publication consists of three parts:
1. Documentation in the form of a this publication's Open File
Authors
Howard G. Wilshire, David R. Bedford, Teresa Coleman
Digital version of "Open-File Report 92-181: Geologic map of the Indian Spring quadrangle, San Bernardino County, California"
This is a digital map database version of a previous printed geologic map, U.S. Geological Survey Open-File Report 92–181. The original paper map has been faithfully reproduced as a geologic map database for use in a GIS, and thus does not contain updated geologic information for the map area. This publication consists of three parts:
Documentation in the form of a this publication's Open File te
Authors
Howard G. Wilshire, David R. Bedford, Teresa Coleman
Digital version of "Open-File Report 92-182: Geologic map of the Marl Mountains quadrangle, San Bernardino County, California"
This is a digital map database version of a previous U.S. Geological Survey Open-File Report, OF92-182. It contains 3 Arc/Info formatted coverages, distributed in Arc Interchange format, a plottable map representation of the database at 1:24,000 scale in Postscript and Adobe PDF formats, and the original map explanation pamphlet in text, Postscript, and Adobe PDF formats.
Authors
Howard G. Wilshire, David R. Bedford, Teresa Coleman
Porphyry copper deposits of the world: Database, maps, and preliminary analysis
Mineral deposit models are important in exploration planning and quantitative resource assessments for two reasons: (1) grades and tonnages among deposit types are significantly different, and (2) many types occur in different geologic settings that can be identified from geologic maps. Mineral deposit models are the keystone in combining the diverse geoscience information on geology, mineral occu
Authors
Donald A. Singer, Vladimir I. Berger, Barry C. Moring
Data set of world phosphate mines, deposits, and occurrences: Part A. Geologic data. Part B. Location and mineral economic data
An inventory of more than 1,600 world phosphate mines, deposits, and occurrences was compiled from smaller data sets collected as part of multiple research efforts by Carlotta Chernoff, University of Arizona, and Greta Orris, U.S. Geological Survey. These data have been utilized during studies of black shale depositional environments and to construct phosphate deposit models. The compiled data hav
Authors
Carlotta B. Chernoff, G. J. Orris
Abstracts for the symposium on the application of neural networks to the earth sciences
Artificial neural networks are a group of mathematical methods that attempt to mimic some of the processes in the human mind. Although the foundations for these ideas were laid as early as 1943 (McCulloch and Pitts, 1943), it wasn't until 1986 (Rumelhart and McClelland, 1986; Masters, 1995) that applications to practical problems became possible. It is the acknowledged superiority of the human min
Authors
Donald A. Singer