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This map illustrates extents and types of unconsolidated deposits and bedrock in the Big Delta A-4 Quadrangle, Alaska. This map is based on field observations begun by P�w� in 1949 and by Reger in 1976. Unit characteristics and extents were determined during field visits and by interpreting 1:40,000-scale black-and-white aerial photographs taken in August 1949 and 1:63,360-scale, false-color infrared aerial photographs taken in July 1978, August 1980, and August 1981.
Core Research Center, cutting DZ02106, from well operated by T J MCLARTY & S D JOHNSON ET ALRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "DZ02106", "API Num": "0505905005", "Operator": "T J MCLARTY & S D JOHNSON ET AL", "Well Name": "1 LILLIE PALLAORO", "Field": null, "State": "CO", "County": "JEFFERSON", "Thin Sec": "F", "Analysis": "T", "Latitude": "39.63622", "Longitude": "-105.16022", "coordinates_geohash": "9xj1rp89tqbt", "Source": "FROM STATE RECORDS", "Min": "560", "Max": "9653", "Security Flag": null, "crc_collection_name": "cutting", "sb_parent_id": "4f4e49d8e4b07f02db5df2d2", "intervals": [{"Formation": null, "Age": null, "Min Depth": null, "Max Depth": null}], "crcwc_url":...
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Between 27 and 11 kyr ago, during the last major (Naptowne) glaciation, the northwestern and western Kenai Peninsula and the Cook Inlet trough were covered by ice except for local nunataks and small refugia, like the Caribou Hills. Landforms related to four glacial stades are recognized and paleogeographic maps document ice limits, drainage systems, glacial-impounded lakes, and glaciomarine terraces. Numerous multidisciplinary studies of glacial, vegetation, and insect histories document Holocene climatic changes.
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The drilling project at Owens Lake commenced in April,1991. This Open-File Report represents an effort to makeavailable to other researchers our preliminary datacollected during the first year of study followingcompletion of the core-drilling phase. Nineteen datacollections and preliminary interpretations are presentedin the following sections. They are the work of fifteenfirst-authors and their numerous co-authors. Broadly,their topics include a field log of the core(1 contribution), sedimentological analyses (1), clay-mineral identification (1), geochemical analyses (5),dating and age estimates of the cored sediments (4), andidentifications of fossil materials (7).
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Okmok volcano, Aleutian Islands, Alaska, explosively erupted over a five-week period between July 12 and August 23, 2008. The eruption was predominantly phreatomagmatic, producing fine-grained tephra that covered most of northeastern Umnak Island. The eruption had a maximum Volcanic Explosivity Index (VEI) of 4, with eruption column heights up to 16 km during the opening phase. Several craters and a master tuff cone formed in the caldera as a result of phreatomagmatic explosions and accumulated tephra-fall and surge deposits. Ascending magma continuously interacted with an extensive shallow groundwater table in the caldera, resulting in the phreatomagmatic character of the eruption. Syneruptive explosion and collapse...
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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...
This publication contains previously unpublished geochemical analyses or re-analyses of lavas, magmatic inclusions, and a few gabbroic cumulate inclusions from Alaska volcanoes (Akutan, Augustine, Buzzard Creek, Dana, Douglas, Fourpeaked, Frosty, Great Sitkin, Iliamna, Kaguyak, Kiska, Okmok, Prindle Cone, Recheshnoi, Redoubt, Spurr, Ukinrek Maars, Vsevidof, Westdahl, Wrangell) collected by the authors and others over the past 35 years. It provides substantial data sets for three volcanoes (Vsevidof, Westdahl, and Douglas) for which little or no published data exist. All analyses were made by the GeoAnalytical laboratory at Washington State University in Pullman, WA. The ICP/MS data have been reduced using the 2006...
Tags: Adagdak, Adak, Akutan, Analyses, Analyses and Sampling, All tags...
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This collection is composed of whole-rock and EPMA tephra glass averages geochemical analyses of rocks from Alaskan volcanoes. Most of the data is from published papers, and some of it is unpublished data from AVO. It is contain analyses for approximately 13,000 samples. Nearly all of the collection is stored in a relational database; the collection is published and searchable at https://avo.alaska.edu/geochem/
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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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The 2018 lower East Rift Zone eruption of Kilauea Volcano began in the late afternoon of 3 May, with fissure 1 opening and erupting lava onto Mohala Street in the Leilani Estates subdivision, part of the lower Puna District of the Island of Hawai'i. For the first week of the eruption, relatively viscous lava flowed only within a kilometer (0.6 miles) of the fissures within Leilani Estates, before activity shifted downrift (east-northeast) and out of the subdivision during mid-May. Around 18 May, activity along the lower East Rift Zone intensified, and fluid lava erupting at higher effusion rates from the downrift fissures reached the ocean within two days. Near the end of May, this more vigorous activity shifted...
Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: East Rift Zone, Fissure08TephraPolys, Green Lake, Hawai'i, Hawaii, All tags...
Core Research Center, cutting DZ18021, from well operated by TETON ENERGYRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "DZ18021", "API Num": "0501306040", "Operator": "TETON ENERGY", "Well Name": "26-1 SUPERIOR ASSOCIATES", "Field": null, "State": "CO", "County": "BOULDER", "Thin Sec": "F", "Analysis": "F", "Latitude": "39.943068", "Longitude": "-105.187031", "coordinates_geohash": "9xj5nrmjhx8c", "Source": "FROM STATE RECORDS", "Min": "880", "Max": "9292", "Security Flag": null, "crc_collection_name": "cutting", "sb_parent_id": "4f4e49d8e4b07f02db5df2d2", "intervals": [{"Formation": null, "Age": null, "Min Depth": null, "Max Depth": null}], "crcwc_url": "https://my.usgs.gov/crcwc/cutting/report/41493",...
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The 2009 eruption of Redoubt Volcano included 19 major tephra-producing explosions. Mass per unit area (MPUA) ash fall sampling of the resulting deposits allowed us to create isomass contours of the ash fall. This dataset contains the vector digital shapefiles of the ash fall contours for the explosive events. In addition, a point digital shapefile is included that describes more than 400 ash fall samples that were collected. For a detailed account of the 2009 eruption of Redoubt Volcano, see Schaefer, J.R., ed., 2012, The 2009 eruption of Redoubt Volcano, Alaska, with contributions by Bull, Katharine, Cameron, Cheryl, Coombs, Michelle, Diefenbach, Angie, Lopez, Taryn, McNutt, Steve, Neal, Christina, Payne, Allison,...
Core Research Center, core R325, from well operated by USGSRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "R325", "API Num": null, "Operator": "USGS", "Well Name": "2 NEWBERRY", "Field": "NEWBERRY VOLCANO", "State": "OR", "County": "DESCHUTES", "Type": "FULL", "Photos": "F", "Thin Sec": "F", "Analysis": "T", "Latitude": "43.708", "Longitude": "-121.225", "coordinates_geohash": "9rcb9ky9sc8r", "Source": "FROM PUBLICATION", "Security Flag": "NO SPECIAL RESTRICTIONS", "crc_collection_name": "core", "sb_parent_id": "4f4e49dae4b07f02db5e0486", "intervals": [{"Formation": "VOLCANICS", "Age": "UNKN", "Min Depth": "1022", "Max Depth": "3046"}], "crcwc_url": "https://my.usgs.gov/crcwc/core/report/12594",...
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Mount Chiginagak is a hydrothermally active volcano on the Alaska Peninsula, approximately 170 km south-southwest of King Salmon, Alaska. This small stratovolcano, approximately 8 km in diameter, has erupted through Tertiary to Permian sedimentary and igneous rocks. The eruptive products of Chiginagak volcano record a history of chiefly andesite lava flows and associated block-and-ash flows. The oldest lavas exposed are Pleistocene in age and are found everywhere around the edifice except in the northeast sector, where Holocene lava flows dominate the landscape. Holocene activity has covered the northeast flank with rubbly-topped andesite lava flows that extend as far as 4.6 km from their source vent at the summit...
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Mount Chiginagak is a hydrothermally active volcano on the Alaska Peninsula, approximately 170 km south-southwest of King Salmon, Alaska. This small stratovolcano, approximately 8 km in diameter, has erupted through Tertiary to Permian sedimentary and igneous rocks. The eruptive products of Chiginagak volcano record a history of chiefly andesite lava flows and associated block-and-ash flows. The oldest lavas exposed are Pleistocene in age and are found everywhere around the edifice except in the northeast sector, where Holocene lava flows dominate the landscape. Holocene activity has covered the northeast flank with rubbly-topped andesite lava flows that extend as far as 4.6 km from their source vent at the summit...
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Fisher volcano, containing the largest Holocene caldera in the Aleutian volcanic arc, is an active volcano near the center of Unimak Island, about 120 kilometers southwest of Cold Bay and about 175 kilometers northeast of Dutch Harbor. The volcano is composed of numerous small volcanic centers around and within a large, oval caldera 12 by 18 kilometers in diameter and 500 to 1,000 meters deep that formed during a catastrophic eruption about 9,400 years ago. Since then, more than 30 separate vents inside and outside the caldera have erupted; the most recent eruption occurred in 1826. These eruptions have produced lava flows and widespread tephra (volcanic ash) deposits, and have occasionally been accompanied by large...


map background search result map search result map Collection of geochemical data from Alaska (AVO) Quaternary geologic map of the Winnipeg 4� � 6� quadrangle, UnitedStates and Canada Core OL-92 from Owens Lake, southeast California A Guide to the Late Quaternary History of Northern and Western Kenai Peninsula, Alaska Ash fall contour map of the 2009 eruption of Redoubt Volcano, Alaska: Digital shapefiles of contours and sample locations Geology of Kasatochi volcano, Aleutian Islands, Alaska Geologic map of the Big Delta A-4 Quadrangle, Alaska Preliminary volcano-hazard assessment for Fisher volcano, Unimak Island, Alaska The 2008 phreatomagmatic eruption of Okmok Volcano, Aleutian Islands, Alaska: Chronology, deposits, and landform changes Geologic map of Mount Chiginagak volcano, Alaska Geologic map of Mount Chiginagak volcano, Alaska Core Research Center Core R325 Core Research Center Cutting DZ02106 Core Research Center Cutting DZ18021 Kilauea 2018 lower East Rift Zone eruption - fissure 08 tephra polygons Geology of Kasatochi volcano, Aleutian Islands, Alaska Kilauea 2018 lower East Rift Zone eruption - fissure 08 tephra polygons Geologic map of Mount Chiginagak volcano, Alaska Geologic map of Mount Chiginagak volcano, Alaska Geologic map of the Big Delta A-4 Quadrangle, Alaska The 2008 phreatomagmatic eruption of Okmok Volcano, Aleutian Islands, Alaska: Chronology, deposits, and landform changes A Guide to the Late Quaternary History of Northern and Western Kenai Peninsula, Alaska Preliminary volcano-hazard assessment for Fisher volcano, Unimak Island, Alaska Quaternary geologic map of the Winnipeg 4� � 6� quadrangle, UnitedStates and Canada Ash fall contour map of the 2009 eruption of Redoubt Volcano, Alaska: Digital shapefiles of contours and sample locations Collection of geochemical data from Alaska (AVO)