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Kasatochi is a small, isolated island volcano in the center of the Aleutian Island chain. It consists of a roughly circular cone approximately 3 km in diameter with a lake-filled central crater that is 1.2 km in diameter and extends from the highest point on the island to sea level. The oldest unit recognized is a thick series of mid-Pleistocene glaciovolcanic deposits consisting of autobrecciated lava, lahars, and volumetrically minor lava masses that we believe to have been emplaced underneath a regional ice cap. This unit is unconformably overlain by several massive Holocene lavas, above which lies a thick sequence of latest-Holocene pyroclastic deposits likely deposited during the crater-forming eruption. The...
The Weldona 7.5' quadrangle is located on the semiarid plains of northeastern Colorado, along the South Platte River corridor where the river has incised into Upper Cretaceous Pierre Shale. The Pierre Shale is largely covered by surficial deposits that formed from alluvial, eolian, and hillslope processes operating in concert with environmental changes from the Pleistocene to the present. The South Platte River, originating high in the Colorado Rocky Mountains, has played a major role in shaping surficial geology in the map area, which is several tens of kilometers downstream from where headwater tributaries join the river. Recurrent glaciation (and deglaciation) of basin headwaters has affected river discharge...
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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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The Quaternary Geologic Map of the Lake Erie 4� x 6� Quadranglewas mapped as part of the Quaternary Geologic Atlas of the United States.The atlas was begun as an effort to depict the areal distribution ofsurficial geologic deposits and other materials that accumulated orformed during the past 2+ million years, the period that includes allactivities of the human species. These materials are at the surface ofthe earth. They make up the "ground" on which we walk, the "dirt" inwhich we dig foundations, and the "soil" in which we grow crops. Mostof our human activity is related in one way or another to these surfacematerials that are referred to collectively by many geologists asregolith, the mantle of fragmental and...
Tags: 26011 = Arenac, 26017 = Bay, 26049 = Genesee, 26063 = Huron, 26087 = Lapeer, All tags...
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The surficial geologic map of the Eastern and Central United Statesdepicts the areal distribution of surficial geologic deposits and othermaterials that accumulated or formed during the past 2+ million years,the period that includes all activities of the human species. Thesematerials are at the surface of the earth. They make up the "ground"on which we walk, the "dirt" in which we dig foundations, and the �soil�in which we grow crops. Most of our human activity is related in oneway or another to these surface materials that are referred tocollectively by many geologists as regolith, the mantle of fragmentaland generally unconsolidated material that overlies the bedrockfoundation of the continent. The map is based...
Tags: Alabama, Allegheny Plateau, Alluvium, Appalachian Plateau, Arkansas, All tags...
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The Fort Morgan 7.5' quadrangle is located on the semiarid plains of northeastern Colorado, along the South Platte River corridor where the river has incised into Upper Cretaceous Pierre Shale. The Pierre Shale is largely covered by surficial deposits that formed from alluvial, eolian, and hillslope processes operating in concert with environmental changes from the late Pliocene to the present. The South Platte River, originating high in the Colorado Rocky Mountains, has played a major role in shaping surficial geology in the map area, which is several tens of kilometers downstream from where headwater tributaries join the river. Recurrent glaciation (and deglaciation) of basin headwaters has affected river discharge...
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The Quaternary Geologic Map of the Winnipeg 4� � 6� DegreeQuadrangle, United States and Canada, is a component of the U.S.Geological Survey Quaternary Geologic Atlas of the United States mapseries (Miscellaneous Investigations Series I-1420), aneffort to produce 4� � 6� Quaternary geologic maps, at1:1 million scale, of the entire conterminous United States andadjacent Canada. The map and the accompanying text and supplementalillustrations provide a regional overview of theareal distributions and characteristics of surficial deposits andmaterials of Quaternary age (~1.8 Ma to present) in parts ofNorth Dakota, Minnesota, Manitoba, and Saskatchewan. The map is not amap of soils as soils are recognized in agriculture.Rather,...
Tags: 1100 - Geology, 1101 - General, 3100 - Vector, 3110 - ESRI, 3112 - export, All tags...
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This report provides detailed (1:63,360-scale) mapping of portions of U.S. Geological Survey Circle B-2 (1955), B-3 (1955), B-4 (1952), C-2 (1955), C-3 (1955), and C-4 (1952) quadrangles. The area is part of the Circle mining district and adjacent to the Fairbanks mining district. This report includes detailed geologic, structural, stratigraphic, and geochronologic data. Based on the resulting geologic maps, field investigations, and laboratory materials analyses, the project has also generated derivative maps of geologic construction materials and geologic hazards.
Tags: Aereal, Aerial Photography, Aeromagnetic Survey, Age Dates, Alaska, State of, All tags...
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This map shows the distribution of unconsolidated deposits and undifferentiated bedrock exposed at the surface in the Sagavanirktok A-3, A-4, B-3, B-4, and portions of the Sagavanirktok A-5 and B-5 quadrangles. Units were mapped by interpretation of stereo pairs of approximately 1:65,000-scale false-color infrared aerial photographs taken in June and August 1978, as well as 2.5 m and 10 m resolution SPOT imagery collected in 2009 and 2010. Fieldwork was completed in 2008.
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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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This 1:50,000 scale geologic map describes the distribution of unconsolidated deposits, identifies local geologic hazards, and provides information about the depositional environment and basic engineering properties of common surficial-geologic materials in and around Shaktoolik, Alaska. Map units are the result of combined field observations and aerial imagery interpretation. A suite of local ground observations were collected over a two-week period in July 2011 by a helicopter-supported team of DGGS geologists and collaborators. Field investigations included soil test pits, sample collection, soil and rock description, oblique aerial photography, and documentation of landscape morphology.
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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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This new 1:24,000-scale geologic map of the Vail West 7.5' quadrangle, as part of the USGS Western Colorado I-70 Corridor Cooperative Geologic Mapping Project, provides new interpretations of the stratigraphy, structure, and geologic hazards in the area on the southwest flank of the Gore Range.Bedrock strata include Miocene tuffaceous sedimentary rocks, Mesozoic and upper Paleozoic sedimentary rocks, and undivided Early(?) Proterozoic metasedimentary and igneous rocks. Tuffaceous rocks are found in fault-tilted blocks. Only small outliers of the Dakota Sandstone, Morrison Formation, Entrada Sandstone, and Chinle Formation exist above the redbeds of the Permian-Pennsylvanian Maroon Formation and Pennsylvanian Minturn...
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This data set contains surficial geologic units in the Eastern and CentralUnited States, as well as a glacial limit line showing the position ofmaximum glacial advance during various geologic time periods. Thegeologic units represent surficial deposits and other surface materialsthat accumulated or formed during the past 2+ million years, such assoils, alluvium, and glacial deposits. These surface materials arereferred to collectively by many geologists as regolith, the mantle offragmented and generally unconsolidated material that overlies the bedrockfoundation of a continent.This data set and the printed map produced from it, U.S. Geological Survey(USGS) Geologic Investigation Series I-2789, were based on 31 publishedmaps...
Tags: Alabama, Allegheny Plateau, Alluvium, Appalachian Plateau, Arkansas, All tags...
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This report presents the findings of a geologic and geotechnical evaluation of a landslide at the Yukon River bridge (the E.L. Patton Bridge). The Yukon River bridge landslide occurred in fall 2012 between approximately 375 and 575 feet west of the bridge. Although there was no damage to the bridge foundation, the landslide's close proximity to the bridge and concerns over additional failures prompted multiple evaluations, including landslide documentation, drainage assessments, and geotechnical studies. This report was prepared to convey the general characteristics of the rock mass, characteristics of rock discontinuities, and the geomorphic expression of the 2012 landslide in the vicinity of the bridge. We determined...
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The Quaternary Geologic Map of the Lake Superior 4° x 6° Quadrangle was mapped as part of the Quaternary Geologic Atlas of the United States. The atlas was begun as an effort to depict the areal distribution of surficial geologic deposits and other materials that accumulated or formed during the past 2+ million years, the period that includes all activities of the human species. These materials are at the surface of the earth. They make up the "ground" on which we walk, the "dirt" in which we dig foundations, and the "soil" in which we grow crops. Most of our human activity is related in one way or another to these surface materials that are referred to collectively by many geologists as regolith, the mantle of...
Categories: Web Site; Tags: 26003 = Alger, 26009 = Antrim, 26011 = Arenac, 26013 = Baraga, 26019 = Benzie, All tags...
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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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This 1:50,000-scale geologic map represents a compilation of the most recent geologic studies of the upper Arkansas River valley, between Leadville and Salida, Colorado. The valley is structurally controlled by an extensional fault system that forms part of the prominent northern Rio Grande rift, an intra-continental region of crustal extension. This work also incorporates new detailed geologic mapping of poorly understood areas within the map area and reinterprets previously studied areas, aided by lidar data that covers 59 percent of the map area. The mapped region extends into the Proterozoic metamorphic and intrusive rocks in the Sawatch Range west of the valley and the Mosquito Range to the east. Paleozoic...
Categories: Data; Tags: 207Pb/206Pb zircon age, 40Ar/39Ar age, Arkansas River, Balltown, Balltown placer gold mining areas, All tags...


map background search result map search result map Generalized Surficial Geologic Map of the Pueblo 1� x 2� Quadrangle, Colorado Quaternary Geologic Map of the Lake Superior 4° x 6° Quadrangle, United States and Canada Surficial Deposits and Materials in the Eastern and Central UnitedStates (East of 102 Degrees West Longitude) Quaternary Geologic Map of the Lake Erie 4� x 6� Quadrangle,United States and Canada Quaternary geologic map of the Winnipeg 4� � 6� quadrangle, UnitedStates and Canada Surficial deposits and materials in the eastern and central UnitedStates (east of 102 degrees west longitude) Generalized Surficial Geologic Map of the Denver 1�x2� Quadrangle, Colorado Geologic Map of the Vail West quadrangle, Eagle County, Colorado Data release for the geologic map of the upper Arkansas River valley region, north-central Colorado Data release for the geologic map of the Weldona 7.5' quadrangle, Morgan County, Colorado Data release for the geologic map of the Fort Morgan 7.5' quadrangle, Morgan County, Colorado Yukon River bridge landslide: Preliminary geologic and geotechnical evaluation Geology of Kasatochi volcano, Aleutian Islands, Alaska Geologic map of the Circle mining district, 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-geologic map of the Livengood area, central Alaska Surficial geology of the Tyonek area, south-central Tyonek Quadrangle, Alaska Surficial-geologic map of parts of the Sagavanirktok and Toolik river drainages, northern Brooks Range foothills, Alaska Surficial geologic map of the Shaktoolik area, Norton Bay Quadrangle, Alaska Yukon River bridge landslide: Preliminary geologic and geotechnical evaluation Geology of Kasatochi volcano, Aleutian Islands, Alaska Geologic Map of the Vail West quadrangle, Eagle County, Colorado Data release for the geologic map of the Weldona 7.5' quadrangle, Morgan County, Colorado Data release for the geologic map of the Fort Morgan 7.5' quadrangle, Morgan County, Colorado Surficial-geologic map of the Livengood area, central Alaska Surficial-geologic map of the northern Fairbanks mining district, Circle Quadrangle, Alaska Surficial-geologic map of the Salcha River-Pogo area, Big Delta Quadrangle, Alaska Geologic map of the Circle mining district, Alaska Surficial geology of the Tyonek area, south-central Tyonek Quadrangle, Alaska Data release for the geologic map of the upper Arkansas River valley region, north-central Colorado Surficial geologic map of the Shaktoolik area, Norton Bay Quadrangle, Alaska Surficial-geologic map of parts of the Sagavanirktok and Toolik river drainages, northern Brooks Range foothills, Alaska Generalized Surficial Geologic Map of the Pueblo 1� x 2� Quadrangle, Colorado Generalized Surficial Geologic Map of the Denver 1�x2� Quadrangle, Colorado Quaternary Geologic Map of the Lake Superior 4° x 6° Quadrangle, United States and Canada Quaternary Geologic Map of the Lake Erie 4� x 6� Quadrangle,United States and Canada Quaternary geologic map of the Winnipeg 4� � 6� quadrangle, UnitedStates and Canada Surficial Deposits and Materials in the Eastern and Central UnitedStates (East of 102 Degrees West Longitude) Surficial deposits and materials in the eastern and central UnitedStates (east of 102 degrees west longitude)