Surficial-geologic map of the Salcha River-Pogo area, Big Delta Quadrangle, Alaska

Reger, R.D.Burns, P.A.C.Staft, L.A.2008Surficial-geologic map of the Salcha River-Pogo area, Big Delta Quadrangle, AlaskageodatabaseReport of InvestigationRI 2004-1CFairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys1 sheet, scale 1:63,360https://doi.org/10.14509/18001Surficial-geologic map of the Salcha River-Pogo area, Big Delta Quadrangle, Alaska, Report of Investigation 2004-1C, 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. Based on the generally subdued nature of glacial deposits in the field area, we speculate that undifferentiated glacial deposits mapped are composed of material deposited by the Charley River (early? Pleistocene), Mt. Harper (middle? Pleistocene), and Eagle (early? Wisconsin) glaciations (Weber, 1986). It is highly unlikely that the area was glaciated during Salcha (late Wisconsin) or Ramshorn (Holocene) glaciations. The northeast-southwest-trending Shaw Creek fault crosses the study area. Although the fault was observed on 1:63,360-scale, false-color, infrared aerial photographs, we were unable to document offset on surficial geologic units. The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: http://doi.org/10.14509/18001.This map shows the distribution of unconsolidated deposits and undifferentiated bedrock units in the Salcha River-Pogo area.This geodatabase is organized according to the AK GeMS mapping schema Hendricks, M.D., Ekberg, P.G., Athey, J.E., Wyatt, W.C., Willingham, A.L., and Naibert, T.J., 2021, AK GeMS data dictionary: A description of the Alaska geologic mapping schema: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 170, 10 p. https://doi.org/10.14509/30669. The distribution package includes ESRI fonts and style files, along with usage instructions. Further documentation of the symbology is provided by Ekberg, P.G., Hendricks, M.D., and Athey, J.E., 2021, AK GeMS symbology: A description of the AK GeMS style file: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 169, 7 p. https://doi.org/10.14509/3058419972023ground conditionCompleteNone planned-145.520318-144.72045964.75589864.368211ISO 19115 Topic CategorygeoscientificInformationAlaska Division of Geological & Geophysical SurveysAlluvial DepositsAlluviumColluvial DepositsColluviumDebris Flow DepositEngineeringFloodplainGeMS DB L3 CompliantGeMS DB v1pt1GeologicGeologic MapGeologyGlacial DepositsGlacial DriftGravelLandslide DepositLoessPebblePingosRetransported LoessSTATEMAP ProjectSandSand and GravelStream SedimentsSurfaceSurficialSurficial Geologic MapSurficial GeologyTerraceUnconsolidated DepositsAlaska Division of Geological & Geophysical SurveysBear CreekBig Delta QuadrangleBonanza CreekCamp CreekFairbanks Mining DistrictGlacier CreekGoodpaster Mining DistrictGoodpaster RiverGoose CreekMaiden CreekMascot CreekPasco CreekPogoRichardson Mining DistrictSalcha RiverSevenmile CreekShaw CreekSonora CreekStone Boys Tent CreekWalker, J.D., Geissman, J.W., Bowring, S.A, and Babcock, L.E., comp., 2012, Geologic Time Scale v. 4.0: Geological Society of AmericaHolocenePleistoceneThis report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.Alaska Division of Geological & Geophysical SurveysMetadata Managermailing and physical

3354 College Road

FairbanksAK99709-3707USA(907)451-5020(907)451-5050dggspubs@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysPlease view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.This map is a component of the Alaska Airborne Geophysical/Geological Mineral Inventory Program funded by the Alaska State Legislature and managed by the State of Alaska, Department of Natural Resources (DNR), Division of Geological & Geophysical Surveys (DGGS). Partial funding for the geologic mapping was also provided by the U.S. Geological Survey, National Cooperative Geologic Mapping Program, under STATEMAP award number 02HQPA0003. The geologic map database was converted to GeMS, quality controlled, and then finalized by DGGS staff Wes Buchanan and Mike Hendricks. Geologic map conversion to the GeMS standard was funded by the USGS National Cooperative Geologic Mapping Program under STATEMAP award number G21AC10706, 2022, and the State of Alaska General Fund. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government.Reger, R.D.Pewe, T.L.2002Geologic map of the Big Delta A-4 Quadrangle, AlaskaReport of InvestigationRI 2002-2Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys1 sheet, scale 1:63,360https://doi.org/10.14509/2869Reger, R.D.Pewe, T.L.2002Geologic map of the Big Delta A-4 Quadrangle, AlaskaReport of InvestigationRI 2002-2Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys1 sheet, scale 1:63,360https://doi.org/10.14509/2869Werdon, M.B.Newberry, R.J.Szumigala, D.J.Burns, L.E.2001Reconnaissance bedrock geology of the Pogo area, Big Delta B-2 and B-3 quadrangles, AlaskaPreliminary Interpretive ReportPIR 2001-5Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys1 sheet, scale 1:63,360https://doi.org/10.14509/2673Attribute fields within each feature class are populated using the map symbology and corresponding applicable values from the GeMS and AK GeMS specifications. When known, certainty in attribute interpretation is indicated in the relevant fields. Attribute accuracy varies throughout the map and is scale-dependent.All polygon features were topologically validated according to the AK GeMS geologic mapping schema specifications.This publication is part of a DGGS Report of Investigations (RI). An RI is the completed product of original research and analysis, and RIs use professional cartography and undergo rigorous peer review, editing, and revision.Certainty in feature boundaries or location varies throughout the map. Data fields within each feature class and the accompanying orientation and location confidence lookup tables record the authors' degree of confidence in the location of applicable features.Ekberg, P.G.Hendricks, M.D.Athey, J.E.2021AK GeMS symbology: A description of the AK GeMS style fileMiscellaneous PublicationMP 169Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys7 phttps://doi.org/10.14509/30584paper2021publication dateEkberg, P.G. and others, 2021GIS analysis and digital cartographyHendricks, M.D.Ekberg, P.G.Athey, J.E.Wyatt, W.C.Willingham, A.L.Naibert, T.J.2021AK GeMS data dictionary: A description of the Alaska geologic mapping schemaMiscellaneous PublicationMP 170Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys10 phttps://doi.org/10.14509/30669paper2021publication dateHendricks, M.D. and others, 2021GIS analysis and digital cartographyU.S. Geological Survey National Cooperative Geologic Mapping Program2020GeMS (Geologic Map Schema) - A standard format for the digital publication of geologic mapsTechniques and MethodsTM 11-B10United StatesU.S. Geological Survey1 phttps://dggs.alaska.gov/pubs/id/30585paper2020publication dateU.S. Geological Survey National Cooperative Geologic Mapping Program, 2020GIS analysis and digital cartographyGeologic mapping - Fieldwork for surficial investigations, including traverses and river exposures, was conducted during the summer of 2001 and 2002. Field notes and sediment samples were collected throughout the map area for surficial investigations. Surficial mapping involved using Pewe and others (1967), and Weber (1983, 1986) on a regular basis for checking glacial geology and general units.Surficial mappers recorded observations on 1:63,360 scale (approximate) color-infrared aerial photographs and 1:63,360 scale topographic base maps. Stations located using air photos and handheld GPS devices with location precision varying from +/-3 to 15 meters. Surficial geologic map was compiled using field notes from fieldwork process step (above) and all known geologic data from previous work in quadrangle.The main sources of existing data include Bacon and others (1996), Pewe and others (1967), and Weber (1983, 1987). Geologic map contacts were delineated by photointerpretation of 1:63,360-scale color-infrared aerial photographs onto clear acetate overlays. The contacts were transferred from the overlays onto USGS 1:63,360 topographic base maps using a zoom transfer scope, the maps were scanned and georeferenced, and the contacts were then digitized using ArcMap. Polygon topology was established and unit designations assigned in ArcMap. DGGS-standard symbology was applied to polygons, linework, and annotation in ArcMap, and the graphics files were converted into .eps files for export to Adobe Illustrator for final cartographic assembly. The conceptual framework for the geology incorporates key ideas from preexisting literature with new data and interpretations developed from field mapping and analytical findings. The accompanying map or report provides a comprehensive bibliographic reference list of prior work used to identify and delineate rock units and structural elements.2002GIS analysis and digital cartography - This data distribution package's geologic and geographic features were organized and attributed according to the AK GeMS geologic mapping schema. The data were programmatically transformed to provide download options in three formats: (1) an AK GeMS data package that includes the complete AK GeMS database and associated files, (2) a GeMS data package that is a conversion of the AK GeMS database into the base GeMS standard published by the USGS, and (3) a shapefile data package that includes two simple shapefile representations of the data.Ekberg, P.G. and others, 2021Hendricks, M.D. and others, 2021U.S. Geological Survey National Cooperative Geologic Mapping Program, 20202022vectorUniversal Transverse Mercator60.999600-1470500000.0000000coordinate pair.00000001.00000001MetersNAD27Clarke 18666378206.4294.9786982salcha_river_pogo_surficial_ak_gems_db_pkgGeodatabase, layer files, style files, and fontsDGGSsalcha_river_pogo_surficial_ak_gems_db_pkgsalcha_river_pogo_surficial_gems_db_pkgGeodatabase, layer files, style files, and fontsDGGSsalcha_river_pogo_surficial_gems_db_pkgsalcha_river_pogo_surficial_gems_shapefile_pkgShapefiles and open data filesDGGSsalcha_river_pogo_surficial_gems_shapefile_pkgAlaska Division of Geological & Geophysical SurveysMetadata Managermailing and physical

3354 College Road

FairbanksAK99709-3707USA(907)451-5020(907)451-5050dggspubs@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysFGDC Content Standard for Digital Geospatial MetadataFGDC-STD-001-1998If the user has modified the data in any way they are obligated to describe the types of modifications they have performed in the supporting metadata file. User specifically agrees not to imply that changes they made were approved by the Alaska Department of Natural Resources or Division of Geological & Geophysical Surveys.https://dggs.alaska.gov/metadata/dggs.extdggs metadata extensions