Werdon, M.B.Newberry, R.J.Szumigala, D.J.2001geodatabasePreliminary Interpretive ReportPIR 2001-3BFairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys1 sheet, scale 1:63,360https://doi.org/10.14509/2670Preliminary Interpretive Report PIR 2001-3B, Bedrock geologic map of the Eagle A-2 Quadrangle, Fortymile mining district, provides 1:63,360-scale geologic mapping of the Eagle A-2 Quadrangle (270 square miles; equivalent to four 7.5-minute quadrangles). The area is part of the 100-year old Fortymile mining district located in eastern Alaska near the Alaska-Yukon border. This geologic map was produced based upon results from field investigations by DGGS in 1999 and 2000, which were part of a three-year mapping program to provide geologic ground truth for airborne geophysical surveys flown by DGGS in the Fortymile mining district during 1998. The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: http://doi.org/10.14509/2670.The project's purpose was to produce a series of 1:63,360-scale geologic maps for a portion of the Fortymile mining district. The geologic data is essential for characterizing and distinguishing between geologic units. Previously published 1:63,360-scale geologic maps of this area have been reconnaissance-level maps or only covered portions of the quadrangle. Mapping at 1:63,360 scale or greater detail is needed to identify critical geologic features related to more regional geologic units. The Fortymile project is part of DGGS's Airborne Geophysical and Geological Mineral Inventory Program (AGGMI), a multi-year investment by the State of Alaska to produce framework geologic maps that expand the knowledge base of Alaska's geologic and mineral resources, catalyze future private-sector mineral exploration and development, and guide government agencies' planning.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/10.14509/3058419992001ground conditioncompleteNone planned-142.009023-141.00000064.25341963.996557ISO 19115 Topic CategorygeoscientificInformationAlaska Division of Geological & Geophysical SurveysAmphiboliteAnalyses and SamplingAr-ArBasaltBatholithBedrockBedrock Geologic MapBedrock GeologyConglomerateDGGSDioriteFaultsFoldsGeMSGeMS NCGMP09GeochronologyGeologic MapGeologyGneissGoldGraniteGranodioriteGraywackeGreenschistGreenstoneHornfelsIgneousLimestoneMarbleMetalsMetamorphicMetamorphic RocksMineral AssessmentMineral DevelopmentMineral ExplorationMineral ResourcesMineralogyMineralsMuscoviteNonmarineOrthogneissPegmatitePlacerPlutonicPlutonsPorphyryQuartziteRhyoliteRocksSTATEMAP ProjectSandstoneSchistSedimentaryShaleSiltstoneSkarnSulfidesTailingsAlaska Division of Geological & Geophysical SurveysFortymile Mining DistrictAlaska Division of Geological & Geophysical SurveysChicken Metamorphic ComplexChicken PlutonFortymile River AssemblageNapoleon Creek PlutonTaylor Mountain BatholithUhler Creek PlutonWalker Fork PlutonWalker, J.D., Geissman, J.W., Bowring, S.A, and Babcock, L.E., comp., 2012, Geologic Time Scale v. 4.0: Geological Society of AmericaPaleozoicThis 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 project is part 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 00HQAG0071 under the NCGM STATEMAP program for FY2000. 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.DGGS StaffSzumigala, D.J.2000NewsletterNL 2000-3Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys9 phttps://doi.org/10.14509/14585Pinney, 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/10.14509/2671Stevens, 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.Pinney, D.S.2001Preliminary Interpretive ReportPIR 2001-3AFairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys1 sheet, scale 1:63,360https://doi.org/10.14509/2669Certainty in attribute interpretation varies throughout the map and is scale-dependent. Attribute fields within each feature class record the authors' degree of confidence in the existence or identity of applicable features.All polygon features were topologically validated according to specifications of the AK GeMS geologic mapping schema.This publication is released as a DGGS Preliminary Interpretive Report (PIR). A PIR is intended to provide timely release maps and reports with a preliminary interpretation of geology or analytical data. One or two people familiar with the geologic problem have reviewed this publication for technical content.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.Burns, L.E.Geoterrex-DighemStevens Exploration Management Corp.Emond, A.M.Graham, G.R.C.2015Geophysical ReportGPR 2015-4Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys12 phttps://doi.org/10.14509/29411paper2015publication dateBurns, L.E. and others, 2015Geologic map compilationEkberg, 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 cartographySzumigala, D.J.Newberry, R.J.Werdon, M.B.Finseth, B.A.Pinney, D.S.Flynn, R.L.2000Raw Data FileRDF 2000-1 v. 1.0.1Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys24 p., 2 sheets, scale 1:63,360https://doi.org/10.14509/272763360paper2000publication dateSzumigala, D.J. and others, 2000Geologic map compilationSzumigala, D.J.Werdon, M.B.Newberry, R.J.Athey, J.E.Clautice, K.H.Flynn, R.L.Grady, J.C.Munly, W.C.Johnson, M.R.2002Raw Data FileRDF 2002-1Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys35 p., 1 sheet, scale 1:63,360https://doi.org/10.14509/286663360paper2002publication dateSzumigala, D.J. and others, 2002Geologic map compilationWerdon, M.B.Szumigala, D.J.Newberry, R.J.Grady, J.C.Munly, W.C.2000Raw Data FileRDF 2000-4Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys29 p., 3 sheets, scale 1:63,360https://doi.org/10.14509/272963360paper2000publication dateWerdon, M.B. and others, 2000Geologic map compilationU.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 - Fieldwork for bedrock investigations, including ridge traverses, road cut investigations, and river exposures, was conducted for 350 person-days during June through August 1999 and 2000. Field notes and rock samples were collected at over 2,550 stations located throughout the quadrangle for bedrock investigations. Fifty person-days were spent on field investigations for the surficial geology. Bedrock mappers recorded observations on 1:50,000 scale topographic maps of the quadrangle. Stations were located using handheld GPS devices with location precision varying from +/-3 to 15 meters.2001Laboratory data compilation - Laboratory analyses were performed on rock samples collected during the fieldwork from July 1999 intermittently through April 2001. Unpublished laboratory results include petrographic work on thin sections and modal analysis of rock slabs stained for plagioclase and potassium feldspar. In addition, results from major-oxide and trace-element geochemistry of igneous and metamorphic rocks were used to calculate CIPW Norms to classify rocks according to established petrologic nomenclature.2001Geologic map compilation - The bedrock geologic map was compiled using field notes, analytical results from laboratory data, and all known geologic data from previous work in the quadrangle. Data was compiled on multiple layers of stable mylar at 1:50,000 scale, with some information plotted at 1:24,000 scale for more detail and later transferred to 1:50,000 scale mylar layers. Relevant information from all mylar layers was compiled onto one stable mylar sheet with abundant control points. The compilation mylar was scanned by a large-format scanner and saved as a TIFF image. The TIFF image was imported into ArcView GIS Version 3.1 and then co-registered to a georeferenced 1:63,360-scale USGS topographic base. Geologic contacts and unit polygons were digitized on-screen in ArcView. Station-specific information such as structural measurements, age samples, and location of dikes too small to be mappable features was imported into ArcView from a Microsoft Access database using GPS locations. Project staff and peer reviewers evaluated the report and accompanying data for readability and logical consistency with related information sources.Burns, L.E. and others, 2015Szumigala, D.J. and others, 2000Szumigala, D.J. and others, 2002Werdon, M.B. and others, 20002001GIS 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.Ekberg, P.G. and others, 2021Hendricks, M.D. and others, 2021U.S. Geological Survey National Cooperative Geologic Mapping Program, 20202021vectorUniversal Transverse Mercator70.999600-1410500000.0000000coordinate pair.00000001.00000001MetersNAD27Clarke 18666378206.40000000037294.978698199999997eagle_a2_bedrock_geology_ak_gems_db_pkgGeodatabase, layer files, style files, and fontsAlaska Division of Geological & Geophysical Surveyseagle_a2_bedrock_geology_ak_gems_db_pkgeagle_a2_bedrock_geology_fed_gems_db_pkgGeodatabase, layer files, style files, and fontsAlaska Division of Geological & Geophysical Surveyseagle_a2_bedrock_geology_fed_gems_db_pkgeagle_a2_bedrock_geology_fed_gems_shapefile_pkgShapefiles and open data filesAlaska Division of Geological & Geophysical Surveyseagle_a2_bedrock_geology_fed_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 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.PIR 2001-3BThe 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 pricinggeodatabasehttps://doi.org/10.14509/2670Free download20210826Alaska 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