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The paper version of the Geologic Map of the eastern part of the Challis National Forest and vicinity, Idaho was compiled by Anna Wilson and Betty Skipp in 1994. 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 digital version for publication as a GIS database. The digital geologic map database can be queried in many ways to produce a variety of geologic maps.
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.
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.
This digital map database, compiled from previously published and unpublished data, and new mapping by the authors, represents the general distribution of bedrock and surficial deposits in the mapped area. Together with the accompanying text file (cdbegeo.txt or cdbegeo.ps), it provides current information on the geologic structure and stratigraphy of the area covered. The database delineates map units that are identified by general age and lithology following the stratigraphic nomenclature of the U.S. Geological Survey. The scale of the source maps limits the spatial resolution (scale) of the database to 1:24,000 or smaller.
These maps show, for emergency service managers in the San FranciscoBay region, the threshold rainfall that may be capable oftriggering a level of debris-flow activity likely to threatenpublic safety. The maps are products of a continuing series ofstudies that began after a catastrophic storm on January 3-5, 1982triggered 18,000 debris flows in the San Francisco Bay region,causing 25 deaths and $66 million in property damage. Thethreshold rainfall values were estimated by re-evaluating aprevious empirical analysis of data from the 1982 storm, and otherhistorical rainfall records, that normalized the rainfall intensitydata by dividing by the mean annual precipitation (MAP) of thecorresponding rain gage. The present...
This report describes the contents of a digital dataset which consistsof four ARC/INFO Export format files. The dataset includes a digitalrepresentation of the Montana state geologic map.
Geologic data from a generalized geologic map of the Coeur d'Alene mining district by Gott and Cathrall (1980) was entered into a geographic information system (GIS) as part of a larger effort to create a regional digital geology for the Pacific Northwest. The map area is located in northern Idaho and extends across the state border into western Montana.
The Santa Ana Quadrangle is in the northern part of the Peninsular Ranges Province as defined by Jahns (1954), except for the northeast corner, which is underlain by basement rocks of the Transverse Ranges Province. A summary of the general geology of the Peninsular Ranges Province is given by Jahns (1954) and a generalized geologic map of this part of the Peninsular Ranges Province is given by Rogers (1965). This report provides a digital representation of this quadrangle.
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...
Contra Costa County is located at the northern end of the DiabloRange of Central California. It is bounded on the north byCarquinez Strait, through which flows 27 percent of California'ssurface water runoff. San Francisco Bay forms the westernboundary, the San Joaquin Valley borders it on the east and theLivermore Valley forms the southern boundary. Contra Costa is oneof the nine Bay Area counties with streams that are tributaries toSan Francisco Bay. Most of the county is mountainous with steeprugged topography. Mount Diablo, in the center of the county, isone of the highest peaks in the Bay Area, reaching an elevation of1173 meters (3,849 ft). Contra Costa County is covered bytwenty-five 7.5' topographic Quadrangles...
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.
The Santa Ana Quadrangle is in the northern part of the Peninsular Ranges Province as defined by Jahns (1954), except for the northeast corner, which is underlain by basement rocks of the Transverse Ranges Province. A summary of the general geology of the Peninsular Ranges Province is given by Jahns (1954) and a generalized geologic map of this part of the Peninsular Ranges Province is given by Rogers (1965). This report provides a digital representation of this quadrangle.
Categories: Web Site;
Tags: 06037 = Los Angeles,
06059 = Orange,
06065 = Riverside,
06071 = San Bernardino,
06073 = San Diego,
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.
This report is one in a series of digital maps, data files, and reports generated by the US Geological Survey to provide geologic process and mineral resource information for the Interior Columbia Basin Ecosystem Management Project (ICBEMP), a US Forst Service and Bureau of Land Management interagency project. The various digital maps and data files which were provided by the USGS, and which are available in this and other reports, are being used in a GIS-based ecosystem assessment which includes a comprehensive analysis of past, present, and future ecosystem conditions within the general area of the Columbia River Basin east of the Cascade Mountains.
This digital map database represents the general distribution of bedrock and surficial deposits in the mapped area. Together with the accompanying text files (hpk_geo.txt, hpk_geo.pdf or hpk_geo.ps), it provides current information on the geologic structure and stratigraphy of the area covered. The database delineates map units that are identified by general age and lithology following the stratigraphic nomenclature of the U.S. Geological Survey. The scale of the source maps limits the spatial resolution (scale) of the database to 1:24,000 or smaller.
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...
Geologic data from the geologic map of the Spokane 1:100,000-scale quadrangle compiled by Joseph (1990) were entered into a geographic information system (GIS) as part of a larger effort to create regional digital geology for the Pacific Northwest. The map area is located in eastern Washington and extendds across the state border into western Idaho.
Digital Bedrock Geologic Map Database of the Beatty 30 X 60-Minute Quadrangle, Nevada and California
This geologic map database is a bedrock compilation of the Beatty30'x 60' quadrangle in southern Nevada and adjoining parts ofCalifornia. The database represents a new compilation at1:100,000-scale of the southern part of the southwestern Nevadavolcanic field and Paleozoic and late Precambrian sedimentary rocksin Bare Mountain and the Funeral Mountains. The map area includesthe entire region around Yucca Mountain, the proposed nationalhigh-level nuclear waste repository, and the eastern part of DeathValley National Park. A major epithermal disseminated gold depositis being mined at Ladd Mountain, in the southeastern BullfrogHills, and the geology of numerous other areas of mineralization inthe Bullfrog Hills and...
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.
The distribution of landslides evident in the landscape -- most ofwhich are slumps, translational slides, and earth flows -- is ofinterest both for evaluation of hazard and risk and for use infurther study of landslides. Future movement of such landslides ismost likely to occur within and around the places where they havepreviously occurred. A map showing the generalized distribution ofthese landslides was published by Nilsen and Wright for the 9-countySan Francisco Bay region in 1979. Original sources available at thetime of that compilation were incomplete for the region. Landslidemapping that has since become available provides a basis forrevision and extension of that work, and modern procedures allowthis to...
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