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During 2009, the Alaska Division of Geological & Geophysical Surveys continued a program, begun in 2006, of reconnaissance mapping of surficial geology in the proposed natural-gas pipeline corridor through the upper Tanana River valley. The study area is a 12-mi-wide (19.3-km-wide) area that straddles the Alaska Highway from the western boundaries of the Tanacross B-3 and A-3 quadrangles near Tetlin Junction eastward to the eastern boundaries of the Nabesna D-1 and C-1 quadrangles along the Canada border. Mapping during 2008-2009 in the Tanacross and Nabesna quadrangles linked with the mapping completed in the Tanacross, Big Delta and Mt. Hayes quadrangles in 2006-2008. Surficial geology was initially mapped in...
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This publication addresses deep-seated landslide susceptibility,debris flow susceptibility, and other geologic hazards in ruralparts of western San Mateo County. The report also estimatespossible costs of investigating and mitigating the landslidehazards. The study area includes the Half Moon Bay 7.5'quadrangle, the Montara Mountain 7.5' quadrangle, and thePescadero/Butano Creeks watershed. Hazard maps were derived byintegrating slope data and previous geologic, landslide and debrisflow mapping. The digital database, which is found athttp://geopubs.wr.usgs.gov/open-file/of00-127includes 43 plotfiles for slope maps, Digital Orthophoto Quadranglemaps, Digital Raster Graphic topographic base maps, geologic maps,deep-seated...
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This surficial-geologic map shows the distribution of unconsolidated deposits and undifferentiated bedrock in the Faith Creek area in the Circle A-4, A-5, B-4, and B-5 quadrangles. This map was prepared principally by the interpretation of 1:63,360-scale, false-color, infrared aerial photographs taken in 1979 and 1981 and is locally verified by ground observations during field work in 2007.
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Thirty-nine types of surficial geologic deposits and residualmaterials of Quaternary age are described and mapped in the greaterDenver area, in part of the Front Range, and in the piedmont andplains east of Denver, Boulder, and Castle Rock. Descriptionsappear in the pamphlet that accompanies the map. Landslidedeposits, colluvium, residuum, alluvium, and other deposits ormaterials are described in terms of predominant grain size, mineralor rock composition (e.g., gypsiferous, calcareous, granitic,andesitic), thickness of deposits, and other physicalcharacteristics. Origins and ages of the deposits and geologichazards related to them are noted. Many lines between geologicunits on our map were placed by generalizing...
Tags: 08001 = Adams, 08005 = Arapahoe, 08013 = Boulder, 08019 = Clear Creek, 08031 = Denver, All tags...
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The Alaska Division of Geological & Geophysical Surveys (DGGS), in partnership with the U.S. National Cooperative Geologic Mapping Program, mapped approximately 450 mi2 of the Talkeetna Mountains region of central Alaska at 1:50,000 scale over the course of six weeks in 2014. This area contains significant exposures of Late Triassic mafic volcanics and gabbro sills that have been the focus of region-wide exploration for the Strategic and Critical platinum-group elements (PGEs). The area also exposes numerous inactive and possibly active faults which project through the area of proposed hydropower development. The resulting geologic map offers an improved understanding of the geology, structural history, and mineral...
Tags: 40Ar/39Ar, Aerial Geology, Aerial Photography, Alluvial, Alluvial Deposits, All tags...
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The Tyonek area in the northwestern Cook Inlet trough is rich in petroleum, coal, geothermal, aggregate, and timber resources, but the detailed geologic mapping necessary for planning future resource development exists only in part of the area. This report and geologic map provide basic surficial-geologic information useful for exploiting those resources and planning future utility corridor developments. In addition to mapping of surficial geologic units, we provide discussion of strategraphic evidence pertaining to physiographic relations and geologic history of volcaniclastic deposits derived from ancestral Mount Spurr, multiple phases of Quaternary glacial activity, Chakachatna River valley landslide complexes...
Tags: Alaska Earthquake 1964, Alluvial Fan, Beluga Plateau, Beluga River, Blockade Glacier, All tags...
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Mass-wasting events that displace water, whether they initiate from underwater sources (submarine landslides) or subaerial sources (subaerial-to-submarine landslides), have the potential to cause tsunami waves that can pose a significant threat to human life and infrastructure in coastal areas (for example towns, cruise ships, bridges, oil platforms, and communication lines). Sheltered inlets and narrow bays can be locations of especially high risk as they often have higher human populations, and the effects of water displacement from moving sediment can be amplified as compared to the effects from similarly sized mass movements in open water. In landscapes undergoing deglaciation, such as the fjords and mountain...
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This publication addresses deep-seated landslide susceptibility, debris flow susceptibility, and other geologic hazards in rural parts of western San Mateo County. The report also estimates possible costs of investigating and mitigating the landslide hazards. The study area includes the Half Moon Bay 7.5' quadrangle, the Montara Mountain 7.5' quadrangle, and the Pescadero/Butano Creeks watershed. Hazard maps were derived by integrating slope data and previous geologic, landslide and debris flow mapping. The digital database, which is found at http://geopubs.wr.usgs.gov/open-file/of00-127 includes 43 plotfiles for slope maps, Digital Orthophoto Quadrangle maps, Digital Raster Graphic topographic base maps, geologic...
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This digital map shows bedding attitude data displayed over the geographic extent of rock stratigraphic units (formations) as compiled by Colton in 1976 (U.S.Geological Survey Map I-855-G) under the Front Range Urban Corridor Geology Program. Colton used his own mapping and published geologic maps having varied map unit schemes to compile one map with a uniform classification of geologic units. The resulting published color paper map was intended for planning for use of land in the Front Range Urban Corridor. In 1997-1999, under the USGS Front Range Infrastructure Resources Project, Colton's map was digitized to provide data at 1:100,000 scale to address urban growth issues(see cross-reference). In general, the...
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Abstract Data Fifty-three types of surficial geologic deposits and residual materials of Quaternary age are described in a pamphlet and located on a map of the greater Pueblo area, in part of the Front Range, in the Wet and Sangre de Cristo Mountains, and on the plains east of Colorado Springs and Pueblo. Deposits formed by landslides, wind, and glaciers, as well as colluvium, residuum, alluvium, and others are described in terms of predominant grain size, mineral or rock composition (e.g., gypsiferous, calcareous, granitic, andesitic), thickness, and other physical characteristics. Origins and ages of the deposits and geologic hazards related to them are noted. Many lines drawn between units on our map were placed...
Categories: Web Site; Tags: 08025 = Crowley, 08027 = Custer, 08035 = Douglas, 08039 = Elbert, 08041 = El Paso, All tags...
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This map illustrates the distribution of unconsolidated deposits and undifferentiated bedrcok units in the Salcha River-Pogo area.It was prepared by interpretation of 1:63,360-scale false-color infrared aerial photographs taken July 1978, July 1979, and August 1981, and is locally verified by ground observations during field visits.
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Fifty-three types of surficial geologic deposits and residual materials of Quaternary age are described in a pamphlet and located on a map of the greater Pueblo area, in part of the Front Range, in the Wet and Sangre de Cristo Mountains, and on the plains east of Colorado Springs and Pueblo. Deposits formed by landslides, wind, and glaciers, as well as colluvium, residuum, alluvium, and others are described in terms of predominant grain size, mineral or rock composition (e.g., gypsiferous, calcareous, granitic, andesitic), thickness, and other physical characteristics. Origins and ages of the deposits and geologic hazards related to them are noted. Many lines drawn between units on our map were placed by generalizing...
Tags: 08025 = Crowley, 08027 = Custer, 08035 = Douglas, 08039 = Elbert, 08041 = El Paso, All tags...
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This digital map shows bedding attitude symbols display overthe geographic extent of surficial deposits and rockstratigraphic units (formations) as compiled by Trimble andMachette 1973-1977 and published in 1979 (U.S. GeologicalSurvey Map I-856-H) under the Front Range Urban CorridorGeology Program. Trimble and Machette compiled their geologicmap from published geologic maps and unpublished geologicmapping having varied map unit schemes. A convenient feature ofthe compiled map is its uniform classification of geologicunits that mostly matches those of companion maps to thenorth (USGS I-855-G) and to the south (USGS I-857-F).Published as a color paper map, the Trimble and Machette mapwas intended for land-use planning...
Tags: 08001 = Adams, 08005 = Arapahoe, 08031 = Denver, 08035 = Douglas, 08039 = Elbert, All tags...


    map background search result map search result map Generalized Surficial Geologic Map of the Pueblo 1� x 2� Quadrangle, Colorado Possible Costs Associated with Investigating and Mitigating Some Geologic Hazards in Rural Parts of San Mateo County, California Generalized Surficial Geologic Map of the Denver 1�x2� Quadrangle, Colorado Generalized Surficial Geologic Map of the Pueblo 1� x 2� Quadrangle, Colorado Possible Costs Associated with Investigating and Mitigating SomeGeologic Hazards in Rural Parts of San Mateo County, California A spatial database of bedding attitudes to accompany Geologic Map of the Boulder--Fort Collins--Greeley area, Colorado, by Roger B. Colton A spatial database of bedding attitudes to accompany Geologic map of the greater Denver area, Front Range urban corridor, Colorado, by Donald E. Trimble and Michael N. Machette Engineering-geologic map of the Alaska Highway corridor, Tetlin Junction to Canada border, Alaska Geologic map of the Talkeetna Mountains C-4 Quadrangle and adjoining areas, central Alaska Surficial-geologic map of the Salcha River-Pogo area, Big Delta Quadrangle, Alaska Surficial-geologic map of the northern Fairbanks mining district, Circle Quadrangle, Alaska Surficial geology of the Tyonek area, south-central Tyonek Quadrangle, Alaska Inventory map of submarine and subaerial-to-submarine landslides in Glacier Bay, Glacier Bay National Park and Preserve, Alaska Surficial-geologic map of the northern Fairbanks mining district, Circle Quadrangle, Alaska Possible Costs Associated with Investigating and Mitigating SomeGeologic Hazards in Rural Parts of San Mateo County, California Possible Costs Associated with Investigating and Mitigating Some Geologic Hazards in Rural Parts of San Mateo County, California Geologic map of the Talkeetna Mountains C-4 Quadrangle and adjoining areas, central Alaska Surficial-geologic map of the Salcha River-Pogo area, Big Delta Quadrangle, Alaska Surficial geology of the Tyonek area, south-central Tyonek Quadrangle, Alaska A spatial database of bedding attitudes to accompany Geologic Map of the Boulder--Fort Collins--Greeley area, Colorado, by Roger B. Colton A spatial database of bedding attitudes to accompany Geologic map of the greater Denver area, Front Range urban corridor, Colorado, by Donald E. Trimble and Michael N. Machette Inventory map of submarine and subaerial-to-submarine landslides in Glacier Bay, Glacier Bay National Park and Preserve, Alaska Generalized Surficial Geologic Map of the Pueblo 1� x 2� Quadrangle, Colorado Generalized Surficial Geologic Map of the Denver 1�x2� Quadrangle, Colorado Generalized Surficial Geologic Map of the Pueblo 1� x 2� Quadrangle, Colorado Engineering-geologic map of the Alaska Highway corridor, Tetlin Junction to Canada border, Alaska