Foster, H.L.Keith, T.C.1968geodatabaseOpen-File ReportOF 68-103United StatesU.S. Geological Survey1 sheet, scale 1:63,360https://dggs.alaska.gov/pubs/id/10771Preliminary geologic map of the Eagle B-1 and C-1 quadrangles, Alaska, Open-File Report 68-103, presents a preliminary geologic map compilation of the Eagle B-1 and C-1 quadrangles in east-central Alaska, showing unconsolidated deposits, sedimentary and igneous units, and a broad suite of metamorphic rocks. Alluvial deposits include floodplain and low-terrace gravel, sand, and silt, and high stream-terrace gravel and sand that are well rounded, well sorted, and locally mantled by windblown silt. Detrital sedimentary rocks consist of non-marine conglomerate, sandstone, and shale containing rounded ultramafic and chert clasts and minor plant fragments. Igneous units include fine-grained basalt dikes with columnar jointing; coarse- to fine-grained granitic rocks dominated by feldspar and quartz; serpentinized ultramafic rocks; and massive quartz-feldspar rock locally associated with muscovite schist. Slightly metamorphosed sedimentary rocks include argillite, phyllite, porous limestone, and minor greenstone. Metamorphic units range from massive to foliated greenstone derived from mafic volcanic rocks to quartz-chlorite-epidote and quartz-mica schists, calcareous schist, quartzite, and marble. Additional units include quartz-graphite schist with interlayered quartzite and mica schist, and amphibolite- to greenschist-facies gneiss and schist containing abundant hornblende and garnet. The map documents lithologic diversity, metamorphic grade, and structural complexity across the quadrangles and provides a geologic framework for regional mapping and resource evaluation. The dataset provides geologic, structural, stratigraphic, and geochronologic information organized according to the GeMS and AK GeMS mapping schemas. The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: https://dggs.alaska.gov/pubs/id/10771.This mapping improves Alaska's understanding of bedrock and surficial geology in the Eagle B-1 and C-1 quadrangles by outlining major lithologic units and metamorphic assemblages. It identifies key alluvial deposits, detrital sedimentary rocks, intrusive igneous units, slightly metamorphosed sedimentary rocks, and greenschist- to amphibolite-facies schist and gneiss. The resulting geologic framework supports mineral resource evaluation, land-management planning, and future geologic work across Alaska.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/10.14509/30584.1968ground conditionCompleteNone planned-141.509552-140.99978964.75061364.249234ISO 19115 Topic CategorygeoscientificInformationAlaska Division of Geological & Geophysical SurveysAlluvialAlluviumAmphiboleAmphiboliteArgilliteBasaltBasinsBedrockBiotiteBrecciaChertChloriteConglomerateDikeDuniteEpidoteFeldsparFelsicFloodplainGarnetGeneralizedGeologyGneissGraphiteGravelGreenschistGreenstoneHornblendeIgneousIgneous RocksIntrusiveLimestoneMarbleMarineMetamorphicMetamorphic RocksMetamorphismMicaMuscovitePeridotitePhyllitePlagioclaseQuartzQuartziteRocksSandSandstoneSchistSedimentSedimentarySedimentary RocksSericiteSerpentineShaleSiltSlateTerraceTuffUltramaficVolcanicAlaska Division of Geological & Geophysical SurveysAlder CreekAlma CreekAmerican CreekBluff CreekBoundary CreekBow CreekBuck CreekBuckeye CreekCastalia CreekColumbia CreekCripple CreekDeadman IslandDewey CreekDick Dale CreekDime CreekDiscovery CreekDome CreekEagle Mining DistrictFlat CreekFortymile DomeFortymile Mining DistrictFortymile RiverGeorgie CreekKing CreekKing Solomon CreekMarion CreekMission CreekMoose CreekPolly CreekPowee CreekQuartz CreekSam Patch CreekSmith CreekSnow CreekSteele CreekTrail CreekTwin CreekUnion CreekWolf CreekYukon RiverWalker, J.D., Geissman, J.W., Bowring, S.A, and Babcock, L.E., comp., 2012, Geologic Time Scale v. 4.0: Geological Society of AmericaMesozoicPaleozoicPrecambrianQuaternaryTertiaryThis 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 was converted to GeMS or digitized into GeMS by Kinney Engineering, LCC., quality controlled, and then finalized by DGGS staff (Chris Wyatt). Ally M. Steinleitner implemented final database quality control and packaging. This geologic map (or report or conversion or product, etc.) was funded by the USGS National Cooperative Geologic Mapping Program under STATEMAP award number G24AC00521, 2024, 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.Pinney, D.S.2001Preliminary Interpretive ReportPIR 2001-3DFairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys1 sheet, scale 1:63,360https://doi.org/10.14509/2672Pinney, D.S.2001Preliminary Interpretive ReportPIR 2001-3CFairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys1 sheet, scale 1:63,360https://doi.org/10.14509/2671Reger, R.D.Stevens, D.S.P.Smith, R.L.2003Miscellaneous PublicationMP 68Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys5 sheets, scale 1:250,000https://doi.org/10.14509/2925Stevens, D.S.P.2012Preliminary Interpretive ReportPIR 2002-1DFairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys1 sheet, scale 1:63,360https://doi.org/10.14509/24544Stevens, D.S.P.Burns, P.A.C.2010Preliminary Interpretive ReportPIR 2002-1CFairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys1 sheet, scale 1:63,360https://doi.org/10.14509/22081Szumigala, D.J.Newberry, R.J.Werdon, M.B.Athey, J.E.Flynn, R.L.Clautice, K.H.2002Preliminary Interpretive ReportPIR 2002-1BFairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys1 sheet, scale 1:63,360https://doi.org/10.14509/2864Szumigala, D.J.Newberry, R.J.Werdon, M.B.Athey, J.E.Stevens, D.S.P.Flynn, R.L.Clautice, K.H.Craw, P.A.2002Preliminary Interpretive ReportPIR 2002-1AFairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys1 sheet, scale 1:63,360https://doi.org/10.14509/2863Werdon, M.B.Newberry, R.J.Szumigala, D.J.2001Preliminary Interpretive ReportPIR 2001-3BFairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys1 sheet, scale 1:63,360https://doi.org/10.14509/2670Werdon, M.B.Newberry, R.J.Szumigala, D.J.Pinney, D.S.2001Preliminary Interpretive ReportPIR 2001-3AFairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys1 sheet, scale 1:63,360https://doi.org/10.14509/2669Attribute 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 U.S. Geological Survey Open-File Report (OF), which provide rapid public release of scientific information. The series includes interpretive reports, maps, supporting data, preliminary findings, interim computer programs, user guides, and bibliographies.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.2021Miscellaneous 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.2021Miscellaneous 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 Program2020Techniques 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 - Geologic mapping was completed by field examination of bedrock and surficial deposits in the Eagle B-1 and C-1 quadrangles. Geologists recorded lithologic characteristics, stratigraphic relations, structural features, and metamorphic textures directly from outcrops. Field observations were combined with reconnaissance mapping from earlier work to refine unit boundaries and update lithologic descriptions. Map units were delineated based on dominant rock type, degree of metamorphism, and sedimentary or igneous features observed in the field. These observations were compiled into a preliminary geologic map showing the distribution of unconsolidated deposits, sedimentary rocks, igneous units, and metamorphic assemblages across the quadrangles.1968Data 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 Mercator70.999600-1410500000.0000000coordinate pair.00000001.00000001MetersNAD27Clarke 18666378206.4294.9786982eagle_b1_c1_quad_ak_gems_dbGeodatabase, layer files, style files, and fontsDGGS and USGSeagle_b1_c1_quad_ak_gems_dbeagle_b1_c1_quad_gems_dbGeodatabase, layer files, style files, and fontsDGGS and USGSeagle_b1_c1_quad_gems_dbeagle_b1_c1_quad_gems_geopackageSQLite Database fileDGGS and USGSeagle_b1_c1_quad_gems_geopackageeagle_b1_c1_quad_gems_shapefileShapefiles and open data filesDGGS and USGSeagle_b1_c1_quad_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 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.OF 68-103The 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.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.Contact DGGS for current pricinggeodatabasegeologic maphttps://dggs.alaska.gov/pubs/id/10771Free download20260901Alaska Division of Geological & Geophysical SurveysSimone MontayneMetadata 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