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Alska is a complex amalgamation of tectonic blocks with diverse histories. Sedimentary basins that are formed on these blocks both before amalgamation and as a result of collisions between them record the tectonic history of this complex region. Thermal-maturity data-indicators of maximum burial temperatures-provide important constraints both on basin evolution and on terrane amalgamation. To help elucidate these relations, and to provide constraints for hydrocarbon assessments, the U.S. Geological survey (USGS) has compilied thermal-maturity data from Alaska for many decades. This report is a digital release of our current understanding of thermal-maturity patters in Alaska.
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This digital map database, which is compiled from previouslyunpublished and open-filed U.S. Geol. Survey reports (Wesling andHelley, 1989), represents the general distribution and identity ofQuaternary deposits in eight 7.5 minute quadrangles in the southernSan Francisco Bay region, California.
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The paper version of The geology of the Challis 1�x2� quadrangle, wascompiled by Fred Fisher, Dave McIntyre and Kate Johnson in 1992. Thegeology was compiled on a 1:250,000 scale topographic base map.TechniGraphic System, Inc. of Fort Collins Colorado digitized this mapunder contract for N.Shock. G.Green edited and prepared the Challisdigital version for publication as a geographic information systemdatabase. The digital geologic map database can be queried in manyways to produce a variety of geologic maps.
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This map identifies the principal areas in the San Francisco Bayregion that are likely to produce debris flows, which are alsocalled "mudslides." Debris flows that occur in the bay region arefast-moving downslope flows of mud that may include rocks,vegetation, and other debris. These flows begin during intenserainfall as shallow landslides on steep slopes. The rapid movementand sudden arrival of debris flows pose a hazard to life andproperty during and immediately following the triggering rainfall.Debris flows in a given storm originate from a number of sourcesscattered throughout steep parts of the landscape, as shown infigure 1 (on map sheet; files sfbr- df.ps, al-df.ps, etc.). Duringsubsequent storms, new debris...
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The digital ARC/INFO databases included in this directory provide a geologic map GIS database of the Absaroka-Beartooth study area (ABSA), a tract of approximately 1.4 million acres of National Forest land in southwestern Montana. The ABSA is adjacent to the northern part of Yellowstone National Park, and includes southeastern parts of Gallatin National Forest and western parts of the Custer National Forest. The geologic map was originally prepared to accompany a U.S. Geological Survey evaluation of the mineral resource potential within the ABSA. The results of this mineral resource assessment were published as U.S. Geological Survey Open-File Report 93-207 and the geologic map was plate 1 of this report. The enclosed...
The ssfb_m1 digital map database, which is compiled from 1970'svintage sources, represents the general distribution and identityof geologic materials in the southern San Francisco Bay region,California, west of the Calaveras fault. It is not a geologic map,because it does not address the geologic structure or thestratigraphic organization of the map units in a systematic way.Instead, it is directed at the distribution and character of thegeologic materials following the pattern of its progenitors,Wentworth and others (1985) and Ellen and Wentworth (in press).Consultation of these reports and the other compilation sources willaid in using the database.
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This digital geologic map compilation presents new polygon (i.e., geologic map unit contacts), line (i.e., fault, fold axis, dike, and caldera wall), and point (i.e., structural attitude) vector data for the Thirsty Canyon NW 7 1/2' quadrangle in southern Nevada. The map database, which is at 1:24,000-scale resolution, provides geologic coverage of an area of current hydrogeologic and tectonic interest. The Thirsty Canyon NW quadrangle is located in southern Nye County about 20 km west of the Nevada Test Site (NTS) and 30 km north of the town of Beatty. The map area is underlain by extensive layers of Neogene (about 14 to 4.5 million years old [Ma]) mafic and silicic volcanic rocks that are temporally and spatially...
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The bedrock geology of the 7.5-minute Windham quadrangle, New Hampshireconsists of deformed early Paleozoic crystalline metamorphic and intrusiveigneous rocks intruded by Mesozoic igneous dikes.The geologic data was mapped during the summer of 1998 at a scale of1:24,000. The bedrock geology was mapped using standard techniques.Locational information was provided by Rockwell PLGR+96 GPS receiversusing the federal precise positioning service.The line and polygon data were compiled on a mylar greenline of the7.5-minute quadrangle and scanned at 400 dpi on an Anatech Eagle 4080Tscanner. The raster files (TIF) were converted to vector files (DXF)using GTX OSR version 2.0 raster-to-vector conversion software. Thevector...
A table keyed to 171 topographic quadrangles on a new1:275,000-scale shaded-relief map speeds access to information onlandslide locations in the ten-county San Francisco Bay region.Detailed maps showing individual landslides in nearly any area ofinterest can be found quickly by knowing only the name of theappropriate 7.5' quadrangle. The some-80 technical reports thatcontain these maps may be consulted in the U.S. Geological Survey'sMenlo Park library collection.
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This Open-File report is a digital physiographic map database.This physiographic map of the Grand Canyon is modified fromprevious versions by Billingsley and Hendricks (1989), andBillingsley and others (1997). The boundary is drawn approximatelyalong the topographic rim of the Grand Canyon and its tributarycanyons between Lees Ferry and Lake Mead (shown in red). Severalisolated small mesas, buttes, and plateaus are within this area,which overall encompasses about 2,600 square miles.The Grand Canyon lies within the southwestern part of the Colorado Plateaus of northern Arizona between Lees Ferry, Colorado River Mile 0, and Lake Mead, Colorado River Mile 277. Limestone rocks of the Kaibab Formation form most of the...
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The digital ARC/INFO databases included in this directory provide a geologic map GIS database of the Custer National Forest in the Pryor Mountains of south-central Montana. The geologic map area comprises approximately 122 square miles (316 square kilometers) of National Forest lands, located 40 miles (64 kilometers) south of Billings, Montana. This geologic map was originally prepared to accompany a U.S. Geological Survey evaluation of the mineral resource potential of the Custer National Forest in the Pryor Mountains. The results of this mineral resource assessment were published as U.S. Geological Survey Open-File Report 96-256. This ARC/INFO database was created from figure 2 (p. 4) of that report.
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The paper version of The geology of the Challis 1°x2° quadrangle, was compiled by Fred Fisher, Dave McIntyre and Kate Johnson in 1992. The geology was compiled on a 1:250,000 scale topographic base map. TechniGraphic System, Inc. of Fort Collins Colorado digitized this map under contract for N.Shock. G.Green edited and prepared the Challis digital version for publication as a geographic information system database. The digital geologic map database can be queried in many ways to produce a variety of geologic maps.
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The digital ARC/INFO databases included in this websiteprovide a GIS database for the geologic map of theDillon 1 degree by 2 degree quadrangle of southwestMontana and east-central Idaho. The geologic mapwas orginally published as U.S. Geological SurveyMiscellaneous Investigations Series Map I-1803-H.This website directory contains ARC/INFO format filesthat can be used to query or display the geology ofUSGS Map I-1803-H with GIS software.
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The geology of western and northern Gallatin National Forest was mapped in two parts as part of an evaluation of its mineral resource potential by the USGS. Previously, the western part was released as Map A and the northern part as Map B of USGS Geologic Investigations Series Map I-2584. These maps were compiled, digitized, and produced using the USGS software program GSMAP. All the original source maps were simplified on mylar overlays, digitized at their original map scales and projections, and then merged into the final maps. After editing, the digital maps were filtered to remove all points not necessary for improving resolution at a scale of 1:126,720 (2 mi per in., the scale used by the USDA Forest Service)....
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The geology of western and northern Gallatin National Forest was mapped in two parts as part of an evaluation of its mineral resource potential by the USGS. Previously, the western part was released as Map A and the northern part as Map B of USGS Geologic Investigations Series Map I-2584. These maps were compiled, digitized, and produced using the USGS software program GSMAP. All the original source maps were simplified on mylar overlays, digitized at their original map scales and projections, and then merged into the final maps. After editing, the digital maps were filtered to remove all points not necessary for improving resolution at a scale of 1:126,720 (2 mi per in., the scale used by the USDA Forest Service)....
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The area of this data set includes the classic geology and mineral deposits of the Keweenaw Peninsula, renowned for the occurrence of great volumes of Middle Proterozoic flood basalts and the world's largest concentration of native copper. Native copper was mined there continuously from the 1840's to the 1960's. For the earlier part of that period the Keweenawan native copper district was the principal source of copper for the United States.
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The Little Piute Mountains in the eastern Mojave Desert expose a seriesof folds and thrust faults involving metamorphosed Paleozoic strata (Millerand others, 1982; Stone and others, 1983). The Little Piute Mountains Digital database contains digital geologic and geographic information for the study area. The geology was mapped at a scale of 1:8,000, and the topographic information was input from the Little Piute Mountains, CA 1:24,000 quadrangle.
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The data in this CD-ROM are based on a mineral resource assessment of the Venezuelan Guayana Shield, conducted between 1987 and 1991 by the U.S. Geological Survey and Corporaci�n Venezolana de Guayana, T�cnica Minera, (USGS, 1993). The Venezuelan Shield occupies about 415,000 sq km in the south and east part of Venezuela. The study area is bounded on the north by the R�o Orinoco. It includes all of the Territorio Federal Amazonas, Estado Bol�var, and part of Estado Delta Amacuro. The original resource assessment publication USGS Bulletin 2062 consists of 121 pages of text and figures as well as eight full-color maps:GeographicGeologic and tectonicBouguer gravityTwo mineral-occurrence mapsSide-looking airborne radar...


map background search result map search result map Geologic Map of the Challis 1°x2° Quadrangle, Idaho Preliminary geologic map of the Mesquite quadrangle, Clark and Lincoln Counties, Nevada and Mohave County, Arizona Geologic map of the Dillon 1�x2� quadrangle, Idaho and Montana Geologic Map of the Challis 1�x2� Quadrangle, Idaho Generalized Thermal Maturity Map of Alaska Preliminary geologic map emphasizing bedrock formations in Alameda County, California: A digital database Preliminary geologic map of the Little Piute Mountains, California: A digital database Digital geologic map of the Thirsty Canyon NW quadrangle, Nye County, Nevada Geology and Mineral Deposits of the Keweenaw Peninsula and Vicinity, Michigan Physiographic Rim of The Grand Canyon, Arizona: A Digital Database Geologic map datasets of the Custer and Gallatin National Forestsof South-central Montana, in ARC/INFO format: Absaroka-Beartooth study area Geologic map datasets of the Custer and Gallatin National Forestsof South-central Montana, in ARC/INFO format: Northern portion Geologic map datasets of the Custer and Gallatin National Forestsof South-central Montana, in ARC/INFO format: Pryor Mountains Geologic map datasets of the Custer and Gallatin National Forestsof South-central Montana, in ARC/INFO format: Western portion Bedrock Geologic Map of the Windham Quadrangle, Rockingham and Hillsborough Counties, New Hampshire: General description Preliminary geologic map of the Little Piute Mountains, California: A digital database Preliminary geologic map of the Mesquite quadrangle, Clark and Lincoln Counties, Nevada and Mohave County, Arizona Digital geologic map of the Thirsty Canyon NW quadrangle, Nye County, Nevada Bedrock Geologic Map of the Windham Quadrangle, Rockingham and Hillsborough Counties, New Hampshire: General description Geologic map datasets of the Custer and Gallatin National Forestsof South-central Montana, in ARC/INFO format: Pryor Mountains Preliminary geologic map emphasizing bedrock formations in Alameda County, California: A digital database Geologic map datasets of the Custer and Gallatin National Forestsof South-central Montana, in ARC/INFO format: Northern portion Geologic map datasets of the Custer and Gallatin National Forestsof South-central Montana, in ARC/INFO format: Western portion Geologic map datasets of the Custer and Gallatin National Forestsof South-central Montana, in ARC/INFO format: Absaroka-Beartooth study area Geology and Mineral Deposits of the Keweenaw Peninsula and Vicinity, Michigan Geologic Map of the Challis 1°x2° Quadrangle, Idaho Geologic map of the Dillon 1�x2� quadrangle, Idaho and Montana Geologic Map of the Challis 1�x2� Quadrangle, Idaho Physiographic Rim of The Grand Canyon, Arizona: A Digital Database Generalized Thermal Maturity Map of Alaska