Identification_Information: Citation: Citation_Information: Originator: Wypych, Alicja Originator: Hubbard, T.D. Originator: Naibert, T.J. Originator: Athey, J.E. Originator: Newberry, R.J. Originator: Sicard, K.R. Originator: Twelker, Evan Originator: Werdon, M.B. Originator: Willingham, A.L. Originator: Wyatt, W.C. Originator: Lockett, A.C. Publication_Date: 2021 Title: Northeast Tanacross geologic map and map units and descriptions Geospatial_Data_Presentation_Form: geodatabase Series_Information: Series_Name: Report of Investigation Issue_Identification: RI 2020-9B Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: p. 9-26, 1 sheet, scale 1:63,360 Online_Linkage: https://doi.org/10.14509/30539 Description: Abstract: Report of Investigation 2020-9B, Northeast Tanacross geologic map and map units and descriptions, provides 500 square miles of 1:63,360-scale geologic mapping in the northeastern Tanacross Quadrangle (Tanacross D-1, and parts of the C-1, C-2, and D-2 quadrangles), located 15 miles southeast of Chicken, Alaska. The project took place during two periods: a reconnaissance mapping effort June 12-22, 2017, and a detailed campaign June 18-July 16, 2018. The map area covers the boundary between the allochthonous Yukon-Tanana terrane (YTT) and the parautochthonous North American margin (pNA) from which the YTT initially rifted. This suture zone has a complex, multiphase structural and metamorphic history, and the northeastern Tanacross Quadrangle is one of the rare areas in which it is exposed. The conceptual framework has been developed in the literature, but it is not fully represented in previously published geologic maps of eastern Alaska. This map encompasses an area of current mineral industry interest; it includes the Taurus porphyry copper-gold-molybdenum +/- rhenium deposit and several other occurrence types, including gold, copper, and molybdenum in porphyritic intrusions, structurally controlled silver-lead-zinc prospects, and placer gold deposits. The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: http://doi.org/10.14509/30539. Purpose: Resurgent mineral industry interest in the East central Alaska region prompted DGGS to conduct new 1:63,360-scale geologic mapping in the northeastern Tanacross Quadrangle. Supplemental_Information: 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/10.14509/30584 Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 2017 Ending_Date: 2018 Currentness_Reference: ground condition Status: Progress: complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -141.653213 East_Bounding_Coordinate: -141.000000 North_Bounding_Coordinate: 64.001478 South_Bounding_Coordinate: 63.612549 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Theme_Keyword: Aerial Theme_Keyword: Aerial Photography Theme_Keyword: Alluvial Theme_Keyword: Alluvial Deposits Theme_Keyword: Amphibolite Theme_Keyword: Amphibolite Facies Units Theme_Keyword: Bedrock Geology Theme_Keyword: Colluvial Deposits Theme_Keyword: Complex Deposits Theme_Keyword: GeMS Theme_Keyword: Geologic Theme_Keyword: Geologic Map Theme_Keyword: Geologic Mapping Standards Theme_Keyword: Gis Theme_Keyword: Glacial Deposits Theme_Keyword: Igneous Theme_Keyword: Igneous Rocks Theme_Keyword: Metamorphic Theme_Keyword: Metamorphic Rocks Theme_Keyword: Metasedimentary Rocks Theme_Keyword: Orthogneiss Theme_Keyword: Quartzite Theme_Keyword: Remote Sensing Theme_Keyword: Schist Theme_Keyword: Sedimentary Theme_Keyword: Sedimentary Rocks Theme_Keyword: Surficial Theme_Keyword: Surficial Geology Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Bedrock Creek Place_Keyword: Big Timber Creek Place_Keyword: Cherry Creek Place_Keyword: Crow Creek Place_Keyword: Dewey Creek Place_Keyword: Divide Mountain Place_Keyword: Dude Creek Place_Keyword: Fishhook Bend Place_Keyword: Fortymile Mining District Place_Keyword: Gold Bar Creek Place_Keyword: Liberty Creek Place_Keyword: McCord Creek Place_Keyword: McElfish Creek Place_Keyword: McKinley Creek Place_Keyword: Prindle Volcano Place_Keyword: Sixtymile River Place_Keyword: Tom Paine Creek Stratum: Stratum_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Stratum_Keyword: Klondike Assemblage Stratum_Keyword: Lake George Assemblage Stratum_Keyword: Nasina Assemblage 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: Cretaceous Temporal_Keyword: Devonian Temporal_Keyword: Late Cretaceous Temporal_Keyword: Late Triassic Temporal_Keyword: Mississippian Temporal_Keyword: Paleozoic Temporal_Keyword: Permian Temporal_Keyword: Quaternary 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: We would like to thank James V. Jones III (USGS, Anchorage) and Robert Gillis (DGGS) for thorough and constructive reviews of the geologic map, map unit descriptions, and report. The DGGS Northeast Tanacross project was funded by the USGS National Cooperative Geologic Mapping Program under STATEMAP award number G18AC00137 for 2018 and by State of Alaska general funds. 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. Cross_Reference: Citation_Information: Originator: Wypych, Alicja Publication_Date: 2021 Title: Northeast Tanacross geologic mapping project, Alaska Series_Information: Series_Name: Report of Investigation Issue_Identification: RI 2020-9 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 75 p Online_Linkage: https://doi.org/10.14509/30537 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: This data release provides legacy geospatial data converted to the GeMS and AK GeMS specifications. Attribute fields within each feature class are populated using 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 specifications of the AK GeMS geologic mapping schema. Completeness_Report: 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. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: This data release provides legacy geospatial data converted to the GeMS and AK GeMS specifications. To record the originating authors' degree of confidence in the location of features, the data include descriptive fields within each feature class and accompanying orientation and location confidence lookup tables. Certainty in feature boundaries or location varies throughout the map. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Aleinikoff, J.N. Originator: Dusel-Bacon, Cynthia Originator: Foster, H.L. Publication_Date: 1986 Title: Geochronology of augen gneiss and related rocks, Yukon-Tanana terrane, east-central Alaska Series_Information: Series_Name: Bulletin Issue_Identification: v. 97, no. 5 Publication_Information: Publication_Place: Unknown Publisher: Geological Society of America Online_Linkage: http://gsabulletin.gsapubs.org/content/97/5/626.abstract Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1986 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Aleinikoff, J.N. and others, 1986 Source_Contribution: Geologic map compilation Source_Information: Source_Citation: Citation_Information: Originator: Burns, L.E. Originator: Fugro Airborne Surveys Corp. Originator: Fugro GeoServices, Inc. Publication_Date: 2011 Title: Ladue survey area: Magnetic and electromagnetic line, grid, and vector data and Maps, Fortymile mining district, Tanacross Quadrangle, eastern Alaska Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2011-1 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 26 sheets, scale 1:63,360, 1 DVD Online_Linkage: https://doi.org/10.14509/22562 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2011 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burns, L.E. and others, 2011 Source_Contribution: Geologic map compilation Source_Information: Source_Citation: Citation_Information: Originator: Burns, L.E. Originator: Geoterrex-Dighem Originator: Stevens Exploration Management Corp. Originator: Emond, A.M. Originator: Graham, G.R.C. Publication_Date: 2015 Title: Fortymile mining district electromagnetic and magnetic airborne geophysical survey data compilation Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2015-4 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 12 p Online_Linkage: https://doi.org/10.14509/29411 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2015 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burns, L.E. and others, 2015 Source_Contribution: Geologic map compilation Source_Information: Source_Citation: Citation_Information: Originator: Dusel-Bacon, Cynthia Originator: Hopkins, M.J. Originator: Mortensen, J.K. Originator: Dashevsky, S.S. Originator: Bressler, J.R. Originator: Day, W.C. Publication_Date: 2006 Title: Paleozoic tectonic and metallogenic evolution of the pericratonic rocks of east-central Alaska and adjacent Yukon Series_Information: Series_Name: Special Paper Issue_Identification: 45 Publication_Information: Publication_Place: Unknown Publisher: Geological Association of Canada Online_Linkage: null Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2006 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Dusel-Bacon, Cynthia and others, 2006, p. 25-74 Source_Contribution: Geologic map compilation Source_Information: Source_Citation: Citation_Information: Originator: Dusel-Bacon, Cynthia Originator: Aleinikoff, J.N. Publication_Date: 1996 Title: U-Pb zircon and titanite ages for augen gneiss from the Divide Mountain area, eastern Yukon-Tanana Upland, Alaska, and evidence for the composite nature of the Fiftymile Batholith Series_Information: Series_Name: Bulletin Issue_Identification: B 2152 Publication_Information: Publication_Place: United States Publisher: U.S. Geological Survey Other_Citation_Details: p. 131-141 Online_Linkage: https://dggs.alaska.gov/pubs/id/4323 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1996 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Dusel-Bacon, Cynthia and Aleinikoff, J.N., 1996, p. 131-141 Source_Contribution: Geologic map compilation 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: Emond, A.M. Originator: CGG Originator: Burns, L.E. Originator: Graham, G.R.C. Originator: CGG Land (US) Inc. Publication_Date: 2015 Title: Tok electromagnetic and magnetic airborne geophysical survey data compilation Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2015-2 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 13 p Online_Linkage: https://doi.org/10.14509/29347 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2015 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Emond, A.M. and others, 2015 Source_Contribution: Geologic map compilation Source_Information: Source_Citation: Citation_Information: Originator: Flynn, R.L. Publication_Date: 2003 Title: Geology of the Boundary area, Eagle A-1 and Tanacross D-1 quadrangles, east-central Alaska Publication_Information: Publication_Place: Fairbanks, Alaska Publisher: University of Alaska Fairbanks Online_Linkage: null Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2003 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Flynn, R.L., 2003 Source_Contribution: Geologic map compilation Source_Information: Source_Citation: Citation_Information: Originator: Gill, R.D. Publication_Date: 1977 Title: Geology and mineral deposits of the southwest quarter of the Tanacross D-1 Quadrangle, Alaska Publication_Information: Publication_Place: Bellingham, Washington Publisher: Western Washington University Online_Linkage: null Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1977 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Gill, R.D., 1977 Source_Contribution: Geologic map compilation 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: Naibert, T.J. Originator: Benowitz, J.A. Originator: Wypych, Alicja Originator: Sicard, K.R. Originator: Twelker, Evan Publication_Date: 2018 Title: 40Ar/39Ar data from the Tanacross D-1 and D-2, Big Delta B-4 and B-5, and Mount Hayes A-6 quadrangles, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2018-3 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 15 p Online_Linkage: https://doi.org/10.14509/30112 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2018 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Naibert, T.J. and others, 2018 Source_Contribution: Geologic map compilation Source_Information: Source_Citation: Citation_Information: Originator: Szumigala, D.J. Originator: Newberry, R.J. Originator: Werdon, M.B. Originator: Athey, J.E. Originator: Flynn, R.L. Originator: Clautice, K.H. Publication_Date: 2002 Title: Bedrock geologic map of the Eagle A-1 Quadrangle, Fortymile mining district Series_Information: Series_Name: Preliminary Interpretive Report Issue_Identification: PIR 2002-1B Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:63,360 Online_Linkage: https://doi.org/10.14509/2864 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2002 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Szumigala, D.J. and others, 2002 Source_Contribution: Geologic map compilation Source_Information: Source_Citation: Citation_Information: Originator: Todd, Erin Originator: Wypych, Alicja Originator: Kylander-Clark, Andrew Publication_Date: 2019 Title: U-Pb and Lu-Hf isotope, age, and trace element data from zircon separates from the Tanacross D-1, and parts of D-2, C-1, and C-2 quadrangles Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2019-5 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/10.14509/30198 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2019 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Todd, Erin and others, 2019 Source_Contribution: Geologic map compilation Source_Information: Source_Citation: Citation_Information: Originator: Werdon, M.B. Originator: Newberry, R.J. Originator: Szumigala, D.J. Publication_Date: 2001 Title: Bedrock geologic map of the Eagle A-2 Quadrangle, Fortymile mining district, Alaska Series_Information: Series_Name: Preliminary Interpretive Report Issue_Identification: PIR 2001-3B Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:63,360 Online_Linkage: https://doi.org/10.14509/2670 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2001 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Werdon, M.B. and others, 2001 Source_Contribution: Geologic map compilation Source_Information: Source_Citation: Citation_Information: Originator: Wypych, Alicja Originator: Hubbard, T.D. Originator: Naibert, T.J. Originator: Athey, J.E. Originator: Newberry, R.J. Originator: Sicard, K.R. Originator: Twelker, Evan Originator: Werdon, M.B. Originator: Willingham, A.L. Originator: Wyatt, W.C. Originator: Lockett, A.C. Publication_Date: 2019 Title: Northeastern Tanacross geologic map, Tanacross D-1, D-2, C-1, and C-2 quadrangles, Alaska Series_Information: Series_Name: Preliminary Interpretive Report Issue_Identification: PIR 2019-6 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 20 p., 1 sheet, scale 1:63,360 Online_Linkage: https://doi.org/10.14509/30197 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2019 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Wypych, Alicja and others, 2019 Source_Contribution: Geologic map compilation 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: Quaternary unconsolidated deposits - This map includes unconsolidated surficial deposits in the Tanacross D-1 Quadrangle, the eastern one-third of the Tanacross D-2 Quadrangle, the northern half of the Tanacross B-2 Quadrangle, and the northeastern one-third of the Tanacross B-2 Quadrangle. To create this map we incorporated (1) geologic information from previous geologic mapping and published literature, (2) new interpretations using remotely sensed imagery, and (3) information gathered from limited field investigations. Previous geologic mapping of the unconsolidated deposits in the Tanacross Quadrangle includes work by Foster (1970) at a scale of 1:250,000, which provided a framework for our mapping and was instrumental in understanding the regional distribution and character of Quaternary deposits. Weber (1986) described the glacial history of the Yukon Tanana Upland and gave detailed descriptions of the extent and character of these deposits. Her work, along with glacial limits mapped by Péwé and others (1967) helped us identify and map glacial deposits in the map area. Work by Pinney (2001) and Stevens and Burns (2010) in the Eagle A-1 and A-2 quadrangles enabled us to understand the distribution and character of deposits in adjoining areas to the north and enhanced our understanding of the morphology and distribution of alluvial terraces, many of which are gold-bearing and extend southward into this map area. Mapping at a scale of 1:50,000 in the adjoining Borden Creek and Crag Mountain quadrangles by Jackson (2005a, 2005b) allowed comparisons with the distribution and character of deposits in Canada. A complete reference list is available in the accompanying report. Process_Date: 2018 Process_Step: Process_Description: Remotely sensed imagery - Surficial geology was mapped by interpreting 2.5-m-resolution SPOT 5 color-infrared and natural color red-green-blue (RGB) imagery (©2013, Distribution SpotImage S.A., SICORP, USA, all rights reserved) collected in 2009 and 2010 and stereoscopic pairs of approximately 1:65,000-scale, false-color, infrared aerial photographs taken in 1978 and 1981. SPOT 5 imagery was interpreted in ArcGIS Pro by overlaying it on hillshade and slopeshade images derived from Interferometric Synthetic Aperture Radar (IFSAR) bare-earth digital-elevation models (DEMs) created using data collected in 2010. By using the pseudo-3-D functionality of ArcGIS Pro and adjusting the transparency of the SPOT 5 imagery and the transparency and color of hillshade and slopeshade images, we were able to visualize subtle differences in features and identify geologic landforms. We used aerial photographs to identify geologic features and check our interpretations. Geospatial polygon features that represent geologic units were drawn using onscreen digitizing techniques in ArcGIS Pro. Process_Date: 2018 Process_Step: Process_Description: Geologic mapping - Fieldwork for bedrock investigations, including ridge traverses and examination of riverbank exposures, took place during two periods: a reconnaissance mapping effort June 12-22, 2017, and a detailed campaign June 18-July 16, 2018. Field notes, magnetic measurements, and rock samples were compiled and collected throughout the map area. Mappers recorded observations on 1:50,000- and 1:63,360-scale topographic base maps and compiled using ArcGIS software. Location data were collected using GPS-enabled tablets (2017 Samsung Galaxy Tab A) running the ESRI Collector App. Process_Date: 2018 Process_Step: Process_Description: Laboratory data compilation - Selected samples were submitted for geochemical and geochronologic analysis. The results were used to further interpret rock units and the stratigraphic and structural history of the map area. Process_Date: 2018 Process_Step: Process_Description: Geologic map compilation - The conceptual framework for the regional geology relies heavily on preexisting literature. The map area is heavily vegitated; consequently, the map interpretation relies heavily on geochemical and geochronological findings, magnetic and electromagnetic survey data, and observations from rocks collected from pits dug into rocky colluvial deposits below surficial loess or sand. A comprehensive bibliographic reference list of prior work used to identify and delineate rock units and structural elements is provided in the accompanying report. The map and report received technical review and editing by several scientists familiar with the subject matter. The authors incorporated the reviewers' suggestions into the final draft when deemed appropriate. Source_Used_Citation_Abbreviation: Aleinikoff, J.N. and others, 1986 Source_Used_Citation_Abbreviation: Burns, L.E. and others, 2011 Source_Used_Citation_Abbreviation: Burns, L.E. and others, 2015 Source_Used_Citation_Abbreviation: Dusel-Bacon, Cynthia and others, 2006, p. 25-74 Source_Used_Citation_Abbreviation: Dusel-Bacon, Cynthia and Aleinikoff, J.N., 1996, p. 131-141 Source_Used_Citation_Abbreviation: Emond, A.M. and others, 2015 Source_Used_Citation_Abbreviation: Flynn, R.L., 2003 Source_Used_Citation_Abbreviation: Gill, R.D., 1977 Source_Used_Citation_Abbreviation: Naibert, T.J. and others, 2018 Source_Used_Citation_Abbreviation: Szumigala, D.J. and others, 2002 Source_Used_Citation_Abbreviation: Todd, Erin and others, 2019 Source_Used_Citation_Abbreviation: Werdon, M.B. and others, 2001 Source_Used_Citation_Abbreviation: Wypych, Alicja and others, 2019 Process_Date: 2020 Process_Step: Process_Description: GIS 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 then 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. Source_Used_Citation_Abbreviation: Ekberg, P.G. and others, 2021 Source_Used_Citation_Abbreviation: Hendricks, M.D. and others, 2021 Source_Used_Citation_Abbreviation: U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020 Process_Date: 2021 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: 7 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -141 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: 298.257222101000025 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: ne_tanacross_ak_gems_db_pkg Entity_Type_Definition: Geodatabase, layer files, style files, and fonts Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys Entity_Attribute_Layer_Name: ne_tanacross_ak_gems_db_pkg Detailed_Description: Entity_Type: Entity_Type_Label: ne_tanacross_gems_db_pkg Entity_Type_Definition: Geodatabase, layer files, style files, and fonts Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys Entity_Attribute_Layer_Name: ne_tanacross_gems_db_pkg Detailed_Description: Entity_Type: Entity_Type_Label: ne_tanacross_gems_shapefile_pkg Entity_Type_Definition: Shapefiles and open data files Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys Entity_Attribute_Layer_Name: ne_tanacross_gems_shapefile_pkg 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: RI 2020-9B 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 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.14509/30539 Fees: Free download Metadata_Reference_Information: Metadata_Date: 20220115 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