Identification_Information: Citation: Citation_Information: Originator: Hubbard, T.D. Originator: Twelker, Evan Originator: Koehler, R.D. Originator: Walser, S.L. Originator: Salisbury, J.B. Publication_Date: 2026 Title: Geologic map of the Yukon River crossing area, Livengood Quadrangle, Alaska Geospatial_Data_Presentation_Form: geodatabase Series_Information: Series_Name: Preliminary Interpretive Report Issue_Identification: PIR 2026-4 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:50,000 Online_Linkage: https://doi.org/10.14509/32121 Description: Abstract: Geologic 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. Purpose: 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. Supplemental_Information: 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. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 2016 Ending_Date: 2026 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -150.067142 East_Bounding_Coordinate: -149.445222 North_Bounding_Coordinate: 66.008919 South_Bounding_Coordinate: 65.416978 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Theme_Keyword: Alluvial Theme_Keyword: Alluvial Deposits Theme_Keyword: Alluvium Theme_Keyword: Argillite Theme_Keyword: Bedrock Theme_Keyword: Bedrock Geologic Map Theme_Keyword: Bedrock Geology Theme_Keyword: Chert Theme_Keyword: Colluvial Deposits Theme_Keyword: Colluvium Theme_Keyword: Conglomerate Theme_Keyword: DGGS Theme_Keyword: Eolian Theme_Keyword: Eolian Deposits Theme_Keyword: Felsic Theme_Keyword: Floodplain Theme_Keyword: Flysch Theme_Keyword: Geologic Theme_Keyword: Geologic Map Theme_Keyword: Geologic Materials Theme_Keyword: Geology Theme_Keyword: Geomorphology Theme_Keyword: Gravel Theme_Keyword: Graywacke Theme_Keyword: Igneous Theme_Keyword: Igneous Rocks Theme_Keyword: Intrusive Theme_Keyword: Landslide Theme_Keyword: Landslide Deposits Theme_Keyword: Loess Theme_Keyword: Metamorphic Theme_Keyword: Mudstone Theme_Keyword: Paludal Theme_Keyword: Peat Theme_Keyword: Phyllite Theme_Keyword: Placer Theme_Keyword: Quartzite Theme_Keyword: Rocks Theme_Keyword: Sand Theme_Keyword: Sandstone Theme_Keyword: Sediment Theme_Keyword: Sedimentary Theme_Keyword: Sedimentary Rocks Theme_Keyword: Shale Theme_Keyword: Silt Theme_Keyword: Siltstone Theme_Keyword: Slate Theme_Keyword: Slope Theme_Keyword: Slope Instability Theme_Keyword: Surface Theme_Keyword: Surficial Theme_Keyword: Surficial Deposits Theme_Keyword: Surficial Geologic Map Theme_Keyword: Surficial Geology Theme_Keyword: Tailings Theme_Keyword: Terrace Theme_Keyword: Terrace Alluvium Theme_Keyword: Terranes Theme_Keyword: Tuff Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Alder Creek Place_Keyword: Chicago Creek Place_Keyword: Clinton Creek Place_Keyword: Crescent Island Place_Keyword: Dalton Highway Place_Keyword: Dawson Creek Place_Keyword: Grouse Creek Place_Keyword: Gunnison Creek Place_Keyword: Hess Creek Place_Keyword: Hunter Creek Place_Keyword: Huron Creek Place_Keyword: Isom Creek Place_Keyword: Lynx Creek Place_Keyword: Maypole Hill Place_Keyword: Melozitna Mining District Place_Keyword: Miller Creek Place_Keyword: Rampart Place_Keyword: Rampart Mining District Place_Keyword: Raven Creek Place_Keyword: Raven Creek Hill Place_Keyword: Ray River Place_Keyword: Sightas Island Place_Keyword: Smoothface Mountain Place_Keyword: Tolovana Mining District Place_Keyword: Trans-Alaska Pipeline Place_Keyword: Troublesome Creek Place_Keyword: Union Creek Place_Keyword: Whymper Creek Place_Keyword: Willow Creek Place_Keyword: Woodcamp Creek Place_Keyword: Yukon Flats Mining District Place_Keyword: Yukon River Stratum: Stratum_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Stratum_Keyword: Amy Creek Assemblage Stratum_Keyword: Rampart Group Stratum_Keyword: Wilber Creek Unit Stratum_Keyword: Wolverine Complex Temporal: Temporal_Keyword_Thesaurus: Walker, J.D., Geissman, J.W., Bowring, S.A, and Babcock, L.E., comp., 2012, Geologic Time Scale v. 4.0: Geological Society of America Temporal_Keyword: Devonian Temporal_Keyword: Early Cretaceous Temporal_Keyword: Eocene Temporal_Keyword: Holocene Temporal_Keyword: Late Jurassic Temporal_Keyword: Mesozoic Temporal_Keyword: Mississippian Temporal_Keyword: Paleogene Temporal_Keyword: Paleozoic Temporal_Keyword: Permian Temporal_Keyword: Quaternary Temporal_Keyword: Silurian Temporal_Keyword: Triassic Access_Constraints: This 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). Use_Constraints: 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. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Position: Metadata Manager Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: (907)451-5020 Contact_Facsimile_Telephone: (907)451-5050 Contact_Electronic_Mail_Address: dggspubs@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays Contact_Instructions: Please 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. Data_Set_Credit: 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. Cross_Reference: Citation_Information: Originator: Hubbard, T.D. Originator: Koehler, R.D. Originator: Twelker, Evan Originator: Jose, Aleena Merin Originator: Walser, S.L. Originator: Crawford, N.E. Originator: Barefoot, J.D. Publication_Date: 2025 Title: Field station locations and magnetic susceptibility data for the Yukon River Crossing Project, Alaska, collected June-July 2016 Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2025-22 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 2 p Online_Linkage: https://doi.org/10.14509/31726 Cross_Reference: Citation_Information: Originator: Koehler, R.D. Publication_Date: 2020 Title: Assessment of potentially active faults in the northwestern Livengood Quadrangle, Alaska Series_Information: Series_Name: Report of Investigation Issue_Identification: RI 2020-4 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 35 p Online_Linkage: https://doi.org/10.14509/30435 Cross_Reference: Citation_Information: Originator: Koehler, R.D. Originator: Reger, R.D. Originator: Sicard, K.R. Originator: Spangler, E.R. Publication_Date: 2013 Title: Yukon River bridge landslide: Preliminary geologic and geotechnical evaluation Series_Information: Series_Name: Preliminary Interpretive Report Issue_Identification: PIR 2013-6 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 69 p Online_Linkage: https://doi.org/10.14509/25642 Cross_Reference: Citation_Information: Originator: Twelker, Evan Originator: Walser, S.L. Originator: Montayne, Simone Publication_Date: 2025 Title: Major-oxide and trace-element geochemical data from rocks collected near the Dalton Highway, Yukon River crossing, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2025-29 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 3 p Online_Linkage: https://doi.org/10.14509/31737 Cross_Reference: Citation_Information: Originator: Wolken, G.J. Originator: Wikstrom Jones, K.M. Publication_Date: 2019 Title: Photogrammetry-derived digital surface model and orthoimagery of areas near the Dalton Highway, Yukon River Crossing, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2019-4 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 5 p Online_Linkage: https://doi.org/10.14509/30183 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Attribute 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. Logical_Consistency_Report: All polygon features were topologically validated according to the AK GeMS geologic mapping schema specifications. Completeness_Report: 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. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: 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. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Ekberg, P.G. Originator: Hendricks, M.D. Originator: Athey, J.E. Publication_Date: 2021 Title: AK GeMS symbology: A description of the AK GeMS style file Series_Information: Series_Name: Miscellaneous Publication Issue_Identification: MP 169 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 7 p Online_Linkage: https://doi.org/10.14509/30584 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2021 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Ekberg, P.G. and others, 2021 Source_Contribution: GIS analysis and digital cartography Source_Information: Source_Citation: Citation_Information: Originator: Hendricks, M.D. Originator: Ekberg, P.G. Originator: Athey, J.E. Originator: Wyatt, W.C. Originator: Willingham, A.L. Originator: Naibert, T.J. Publication_Date: 2021 Title: AK GeMS data dictionary: A description of the Alaska geologic mapping schema Series_Information: Series_Name: Miscellaneous Publication Issue_Identification: MP 170 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 10 p Online_Linkage: https://doi.org/10.14509/30669 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2021 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Hendricks, M.D. and others, 2021 Source_Contribution: GIS analysis and digital cartography Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey National Cooperative Geologic Mapping Program Publication_Date: 2020 Title: GeMS (Geologic Map Schema) - A standard format for the digital publication of geologic maps Series_Information: Series_Name: Techniques and Methods Issue_Identification: TM 11-B10 Publication_Information: Publication_Place: United States Publisher: U.S. Geological Survey Other_Citation_Details: 1 p Online_Linkage: https://dggs.alaska.gov/pubs/id/30585 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2020 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020 Source_Contribution: GIS analysis and digital cartography Process_Step: Process_Description: Geologic 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. Process_Date: 2026 Process_Step: Process_Description: Data 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. Process_Date: 2026 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: vector Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 6 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -147 Latitude_of_Projection_Origin: 0 False_Easting: 500000.000000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: .00000001 Ordinate_Resolution: .00000001 Planar_Distance_Units: Meters Geodetic_Model: Horizontal_Datum_Name: NAD83 Ellipsoid_Name: GRS 80 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298.257222101 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: yukon_crossing_ak_gems_db Entity_Type_Definition: Geodatabase, layer files, style files, and fonts Entity_Type_Definition_Source: DGGS Entity_Attribute_Layer_Name: yukon_crossing_ak_gems_db Detailed_Description: Entity_Type: Entity_Type_Label: yukon_crossing_gems_db Entity_Type_Definition: Geodatabase, layer files, style files, and fonts Entity_Type_Definition_Source: DGGS Entity_Attribute_Layer_Name: yukon_crossing_gems_db Detailed_Description: Entity_Type: Entity_Type_Label: yukon_crossing_gems_geopackage Entity_Type_Definition: SQLite Database file Entity_Type_Definition_Source: DGGS Entity_Attribute_Layer_Name: yukon_crossing_gems_geopackage Detailed_Description: Entity_Type: Entity_Type_Label: yukon_crossing_gems_shapefile Entity_Type_Definition: Shapefiles and open data files Entity_Type_Definition_Source: DGGS Entity_Attribute_Layer_Name: yukon_crossing_gems_shapefile Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Position: Metadata Manager Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: (907)451-5020 Contact_Facsimile_Telephone: (907)451-5050 Contact_Electronic_Mail_Address: dggspubs@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays Contact_Instructions: Please 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. Resource_Description: PIR 2026-4 Distribution_Liability: The State of Alaska makes no expressed 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. Standard_Order_Process: Non-digital_Form: DGGS publications are available as free online downloads or you may purchase paper hard-copies or digital files on CD/DVD or other digital storage media by mail, phone, fax, or email from the DGGS Fairbanks office. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard. Turnaround time is 1-2 weeks unless special arrangements are made and an express fee is paid. Shipping charge will be the actual cost of postage and will be added to the total amount due. Contact us for the exact shipping amount. Fees: Contact DGGS for current pricing Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: geodatabase Format_Information_Content: geologic map Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.14509/32121 Fees: Free download Metadata_Reference_Information: Metadata_Date: 20260727 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Person: Simone Montayne Contact_Position: Metadata Manager Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: (907)451-5020 Contact_Facsimile_Telephone: (907)451-5050 Contact_Electronic_Mail_Address: dggspubs@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Use_Constraints: If 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. Metadata_Extensions: Online_Linkage: https://dggs.alaska.gov/metadata/dggs.ext Profile_Name: dggs metadata extensions