Mission Areas

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Mission Areas L2 Landing Page Tabs

Filter Total Items: 1,006
Year Published: 2000

Digital geologic map of the Coeur d'Alene 1:100,000 quadrangle, Idaho and Montana

Between 1961 and 1969, Alan Griggs and others conducted fieldwork to prepare a geologic map of the Spokane 1:250,000 map (Griggs, 1973). Their field observations were posted on paper copies of 15-minute quadrangle maps. In 1999, the USGS contracted with the Idaho Geological Survey to prepare a digital version of the Coeur d’Alene 1:100,000...

digital compilation by Munts, Steven R.
Digital geologic map of the Coeur d'Alene 1:100,000 quadrangle, Idaho and Montana; 2000; OFR; 2000-135; digital compilation by Munts, Steven R.

Year Published: 2000

Geologic map and digital database of the Apache Canyon 7.5' quadrangle, Ventura and Kern counties, California

The Apache Canyon 7.5-minute quadrangle is located in southwestern California about 55 km northeast of Santa Barbara and 65 km southwest of Bakersfield. This report presents the results of a geologic mapping investigation of the Apache Canyon quadrangle that was carried out in 1997-1999 as part of the U.S. Geological Survey's Southern California...

Stone, Paul; Cossette, P.M.
Geologic map and digital database of the Apache Canyon 7.5' quadrangle, Ventura and Kern counties, California; 2000; OFR; 2000-359; Stone, Paul; Cossette, P. M.

Year Published: 2000

Operational guidelines (version 1.0) for geological fieldwork in areas endemic for Coccidioidomycosis (Valley Fever)

Coccidioidomycosis (Valley Fever) is a disease caused by the inhalation of the arthroconidia (spores) of Coccidioides immitis, a fungus that lives in the soils of southwestern United States. Although large numbers of people are exposed to the arthroconidia and are consequently infected, very few individuals contract the more serious forms of the...

Fisher, Frederick S.; Bultman, Mark W.; Pappagianis, Demosthenes
Operational guidelines (version 1.0) for geological fieldwork in areas endemic for Coccidioidomycosis (Valley Fever); 2000; OFR; 2000-348; Fisher, Frederick S.; Bultman, Mark W.; Pappagianis, Demosthenes

Year Published: 2000

Basement structure beneath Langford Well Lake basin, Fort Irwin, California, based on inversion of gravity data

Gravity data were used to study the basement structure of Langford Well Lake basin at the U.S. Army National Training Center, Fort Irwin, California. Figure 1 shows the location of the study area. During 1996 and 1999, 290 new gravity stations were measured. These data were merged with existing data to produce a depth-to-basement map, which, in...

Morin, Robert L.
Basement structure beneath Langford Well Lake basin, Fort Irwin, California, based on inversion of gravity data; 2000; OFR; 2000-518; Morin, Robert L.

Year Published: 2000

Principal facts for gravity stations in the Antelope Valley-Bedell Flat area, west-central Nevada

In April 2000 the U.S. Geological Survey (USGS) established 211 gravity stations in the Antelope Valley and Bedell Flat area of west-central Nevada (see figure 1). The stations were located about 15 miles north of Reno, Nevada, southwest of Dogskin Mountain, and east of Petersen Mountain, concentrated in Antelope Valley and Bedell Flat (figure 2...

Jewel, Eleanore B.; Ponce, David A.; Morin, Robert L.
Principal facts for gravity stations in the Antelope Valley-Bedell Flat area, west-central Nevada; 2000; OFR; 2000-506; Jewel, Eleanore B.; Ponce, David A.; Morin, Robert L.

Year Published: 2000

Geologic map database of the El Mirage Lake area, San Bernardino and Los Angeles Counties, California

This geologic map database for the El Mirage Lake area describes geologic materials for the dry lake, parts of the adjacent Shadow Mountains and Adobe Mountain, and much of the piedmont extending south from the lake upward toward the San Gabriel Mountains. This area lies within the western Mojave Desert of San Bernardino and Los Angeles Counties,...

Miller, David M.; Bedford, David R.
Geologic map database of the El Mirage Lake area, San Bernardino and Los Angeles Counties, California; 2000; OFR; 2000-222; Miller, David M.; Bedford, David R.

Year Published: 2000

MORPH-II, a software package for the analysis of scanning-electron-micrograph images for the assessment of the fractal dimension of exposed stone surfaces

Turcotte, 1997, and Barton and La Pointe, 1995, have identified many potential uses for the fractal dimension in physicochemical models of surface properties. The image-analysis program described in this report is an extension of the program set MORPH-I (Mossotti and others, 1998), which provided the fractal analysis of electron-microscope images...

Mossotti, Victor G.; Eldeeb, A. Raouf
MORPH-II, a software package for the analysis of scanning-electron-micrograph images for the assessment of the fractal dimension of exposed stone surfaces; 2000; OFR; 2000-13; Mossotti, Victor G.; Eldeeb, A. Raouf

Year Published: 2000

Preliminary report on geophysics of the Verde River headwaters region, Arizona

This report summarizes the acquisition, data processing, and preliminary interpretation of a high-resolution aeromagnetic and radiometric survey near the confluence of the Big and Little Chino basins in the headwaters of the Verde River, Arizona. The goal of the aeromagnetic study is to improve understanding of the geologic framework as it affects...

Langenheim, V.E.; Duval, J.S.; Wirt, Laurie; DeWitt, Ed
Preliminary report on geophysics of the Verde River headwaters region, Arizona; 2000; OFR; 2000-403; Langenheim, Victoria E.; Duval, J. S.; Wirt, Laurie; Dewitt, Ed

Year Published: 2000

Geologic datasets for weights of evidence analysis in northeast Washington: 1. geologic raster data

This dataset contains the combination of geology data (geologic units, faults, folds, and dikes) from 6 1:100,000 scale digital coverages in eastern Washington (Chewelah, Colville, Omak, Oroville, Nespelem, Republic). The data was converted to an Arc grid in ArcView using the Spatial Analyst extension.

Boleneus, David E.; Causey, J. Douglas
Geologic datasets for weights of evidence analysis in northeast Washington: 1. geologic raster data; 2000; OFR; 2000-495; Boleneus, David E.; Causey, J. Douglas

Year Published: 2000

Geophysical constraints on the Virgin River Depression, Nevada, Utah, and Arizona

Gravity and aeromagnetic data provide insights into the subsurface lithology and structure of the Virgin River Depression (VRD) of Nevada, Utah, and Arizona. The gravity data indicate that the Quaternary and Tertiary sedimentary deposits hide a complex pre-Cenozoic surface. A north-northwest-trending basement ridge separates the Mesquite and...

Langenheim, V.E.; Glen, J.M.; Jachens, R.C.; Dixon, G.L.; Katzer, T.C.; Morin, R.L.
Geophysical constraints on the Virgin River Depression, Nevada, Utah, and Arizona; 2000; OFR; 2000-407; Langenheim, Victoria E.; Glen, J. M.; Jachens, R. C.; Dixon, G. L.; Katzer, T. C.; Morin, R. L.

Year Published: 2000

Geologic map of the Lone Pine 15' quadrangle, Inyo County, California

Oblique aerial view west across Owens Valley in Lone Pine 15' quadrangle. In distance, Sierra Nevada, capped by Mount Whitney (elev. 14,494 ft; 4,418 m). In middle distance, Alabama Hills, town of Lone Pine, and Owens River. In foreground, Kern Knob, at base of Inyo Mountains. Movement along Owens Valley Fault Zone, at base of Alabama Hills,...

Stone, Paul; Dunne, George C.; Moore, James G.; Smith, George I.
Geologic map of the Lone Pine 15' quadrangle, Inyo County, California; 2000; I; 2617; Stone, Paul; Dunne, George C.; Moore, James G.; Smith, George I.

Year Published: 2000

Age and paleoenvironmental significance of mega-invertebrates from the "San Pedro" Formation in the Coyote Hills, Fullerton and Buena Park, Orange County, Southern California

The "San Pedro" Formation in the Coyote Hills contains an invertebrate fossil as-semblage of 184 taxa from 158 localities. The fauna consists of two annelids, 174 mollusks (80 bivalves, 94 gastropods, and three scaphopods), five arthropods, and three echinoids, along with other minor constituents recognized by not specifically identified during...

Powell, Charles L.; Stevens, Dave
Age and paleoenvironmental significance of mega-invertebrates from the "San Pedro" Formation in the Coyote Hills, Fullerton and Buena Park, Orange County, Southern California; 2000; OFR; 2000-319; Powell, Charles L.; Stevens, Dave