Geologic map of the Yukon River crossing area, Livengood Quadrangle, Alaska

Hubbard, T.D.Twelker, EvanKoehler, R.D.Walser, S.L.Salisbury, J.B.2026Geologic map of the Yukon River crossing area, Livengood Quadrangle, AlaskageodatabasePreliminary Interpretive ReportPIR 2026-4Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys1 sheet, scale 1:50,000https://doi.org/10.14509/32121Geologic map of the Yukon River crossing area, Livengood Quadrangle, Alaska, Preliminary Interpretive Report 2026-4, presents results of fieldwork conducted by geologists from the Alaska Division of Geological and Geophysical Surveys (DGGS) during June and July 2016 in Livengood D-6, C-6, and the northern portion of B-6 quadrangles as part of the Yukon River Crossing Capital Improvement Project. The study area spans approximately 567 mi2 (1,458 km2) and focuses on a geologically complex and vulnerable segment of the Trans Alaska Pipeline and the Dalton Highway. The project seeks to improve understanding of local geology near the Yukon River highway bridge crossing, where a 2012 landslide occurred west of the bridge's south abutment. Field data were collected during a helicopter-supported program from June 23 to July 4, 2016. Surficial geology is interpreted through a desktop study of remotely sensed imagery and relevant literature, verified by field observations. Bedrock geology is adapted from Weber and others (1992; 1997) and Chapman and others (1971; orientation points only), with limited modifications based on geophysical surveys (Emond and others, 2018; Emond and MPX Geophysics, Ltd., 2022) and field observations. Together, these datasets form the basis for updated geologic unit definitions, geomorphic interpretations, and structural observations. This mapping provides stakeholders with information about geologic hazards, including those related to seismic activity and slope stability, near the economically significant Yukon River Dalton Highway crossing. The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: https://doi.org/10.14509/32121.This map supports evaluation of geologic hazards and infrastructure vulnerability along a critical segment of the Trans Alaska Pipeline and the Dalton Highway, including areas affected by a 2012 landslide. The publication provides updated geologic interpretations based on field observations, remote sensing, existing mapping, and recent geophysical surveys to assist stakeholders in assessing seismic and slope-stability risks in the project area.This geodatabase is organized according to the AK GeMS mapping schema Hendricks, M.D., Macpherson, A.E., Athey, J.E., Wyatt, W.C., Montayne, Simone, Buchanan, Wes, Rivera, P.G., and Steinleitner, A.M., 2024, AK GeMS data dictionary: A description of the Alaska geologic mapping schema: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 170 v. 2, 13 p. https://doi.org/10.14509/31172. 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/10.14509/30584.20162026ground conditionCompleteNone planned-150.067142-149.44522266.00891965.416978ISO 19115 Topic CategorygeoscientificInformationAlaska Division of Geological & Geophysical SurveysAlluvialAlluvial DepositsAlluviumArgilliteBedrockBedrock Geologic MapBedrock GeologyChertColluvial DepositsColluviumConglomerateDGGSEolianEolian DepositsFelsicFloodplainFlyschGeologicGeologic MapGeologic MaterialsGeologyGeomorphologyGravelGraywackeIgneousIgneous RocksIntrusiveLandslideLandslide DepositsLoessMetamorphicMudstonePaludalPeatPhyllitePlacerQuartziteRocksSandSandstoneSedimentSedimentarySedimentary RocksShaleSiltSiltstoneSlateSlopeSlope InstabilitySurfaceSurficialSurficial DepositsSurficial Geologic MapSurficial GeologyTailingsTerraceTerrace AlluviumTerranesTuffAlaska Division of Geological & Geophysical SurveysAlder CreekChicago CreekClinton CreekCrescent IslandDalton HighwayDawson CreekGrouse CreekGunnison CreekHess CreekHunter CreekHuron CreekIsom CreekLynx CreekMaypole HillMelozitna Mining DistrictMiller CreekRampartRampart Mining DistrictRaven CreekRaven Creek HillRay RiverSightas IslandSmoothface MountainTolovana Mining DistrictTrans-Alaska PipelineTroublesome CreekUnion CreekWhymper CreekWillow CreekWoodcamp CreekYukon Flats Mining DistrictYukon RiverAlaska Division of Geological & Geophysical SurveysAmy Creek AssemblageRampart GroupWilber Creek UnitWolverine ComplexWalker, J.D., Geissman, J.W., Bowring, S.A, and Babcock, L.E., comp., 2012, Geologic Time Scale v. 4.0: Geological Society of AmericaDevonianEarly CretaceousEoceneHoloceneLate JurassicMesozoicMississippianPaleogenePaleozoicPermianQuaternarySilurianTriassicThis 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 work was made possible through funding from a capital improvement project sponsored by the State of Alaska. We gratefully acknowledge the U.S. Bureau of Land Management, Doyon Limited, Ban O Yeel Kon Corporation, and the U.S. Fish and Wildlife Service for providing the necessary permits to carry out this fieldwork. We thank the staff and management at the Yukon River Camp for their hospitality while we collected field data.Hubbard, T.D.Koehler, R.D.Twelker, EvanJose, Aleena MerinWalser, S.L.Crawford, N.E.Barefoot, J.D.2025Field station locations and magnetic susceptibility data for the Yukon River Crossing Project, Alaska, collected June-July 2016Raw Data FileRDF 2025-22Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys2 phttps://doi.org/10.14509/31726Koehler, R.D.2020Assessment of potentially active faults in the northwestern Livengood Quadrangle, AlaskaReport of InvestigationRI 2020-4Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys35 phttps://doi.org/10.14509/30435Koehler, R.D.Reger, R.D.Sicard, K.R.Spangler, E.R.2013Yukon River bridge landslide: Preliminary geologic and geotechnical evaluationPreliminary Interpretive ReportPIR 2013-6Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys69 phttps://doi.org/10.14509/25642Twelker, EvanWalser, S.L.Montayne, Simone2025Major-oxide and trace-element geochemical data from rocks collected near the Dalton Highway, Yukon River crossing, AlaskaRaw Data FileRDF 2025-29Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys3 phttps://doi.org/10.14509/31737Wolken, G.J.Wikstrom Jones, K.M.2019Photogrammetry-derived digital surface model and orthoimagery of areas near the Dalton Highway, Yukon River Crossing, AlaskaRaw Data FileRDF 2019-4Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys5 phttps://doi.org/10.14509/30183Attribute 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 a DGGS Preliminary Interpretive Report (PIR). PIRs present emergent interpretations of geologic mapping or analytical investigation. These publications are reviewed for clarity and consistency and receive limited peer review.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 - DGGS staff collected field observations during a helicopter-supported program from June 23 to July 4, 2016 in Livengood D-6, C-6, and northern B-6 quadrangles. Surficial geology was interpreted through a desktop review of remotely sensed imagery and published literature, and verified with field observations. Bedrock geology was compiled from existing maps by Weber and others (1992, 1997) and Chapman and others (1971), and was updated using geophysical survey data from Emond and others (2018) and Emond and MPX Geophysics Ltd. (2022). These datasets were integrated to produce updated geologic unit definitions, geomorphic interpretations, and structural observations for the Yukon River Crossing project area.2026Data packaging - DGGS organized and attributed the geologic and geographic features according to the AK GeMS schema, then programmatically transformed the data into four distribution formats: (1) an AK GeMS data package containing the full database and supporting files, (2) a GeMS data package converted to the USGS base standard, (3) a SQLite database file, and (4) a simplified shapefile package with shapefile representations of the data.2026vectorUniversal Transverse Mercator60.999600-1470500000.0000000coordinate pair.00000001.00000001MetersNAD83GRS 806378137298.257222101yukon_crossing_ak_gems_dbGeodatabase, layer files, style files, and fontsDGGSyukon_crossing_ak_gems_dbyukon_crossing_gems_dbGeodatabase, layer files, style files, and fontsDGGSyukon_crossing_gems_dbyukon_crossing_gems_geopackageSQLite Database fileDGGSyukon_crossing_gems_geopackageyukon_crossing_gems_shapefileShapefiles and open data filesDGGSyukon_crossing_gems_shapefileAlaska 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