Athey, J.E. Newberry, R.J. Werdon, M.B. Freeman, L.K. Smith, R.L. Szumigala, D.J. 2006 Map and vector digital data Report of Investigation RI 2006-2 v 1.0.1 Fairbanks, AK, USA State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (DGGS) 1 sheet, scale 1:50,000, 98 pp. http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=15026 Report of Investigation 2006-2, "Bedrock geologic map of the Liberty Bell area, Fairbanks A-4 Quadrangle, Bonnifield mining district, Alaska," is the bedrock geologic map of an approximately 131-square-mile area surrounding the Liberty Bell Mine. The geology of the Liberty Bell area, located in the northern Alaska Range foothills, comprises Devonian metasedimentary and meta-igneous rocks of the Totatlanika Schist and Keevy Peak formations, Cretaceous and Tertiary igneous rocks, and overlying unconsolidated Tertiary sedimentary rocks of the Usibelli Group and the younger Nenana Gravel. The Liberty Bell bedrock geologic map was produced from field work in 2005 by mineral-resource personnel from the Alaska Division of Geological & Geophysical Surveys and the University of Alaska Fairbanks. The purpose of the project is to provide 1:50,000-scale geologic mapping of a portion of the Liberty Bell airborne geophysical survey area. The helicopter-based survey included aeromagnetic and electromagnetic data which were released by DGGS in 2002. The geophysical survey and geologic mapping are part of the Alaska Airborne Geophysical/Geological Mineral Inventory Program, a special multi-year investment by the State of Alaska to expand Alaska's geologic and mineral resources knowledge base, catalyze future private-sector mineral exploration and development, and guide state planning. The dataset is comprised of the 32 layers, which compose the bedrock geologic map and the inset map. All 32 layers are available as shape (*.shp) files. Ten additional Arc Export (*.e00) files of annotation are also available for presentational purposes. Attribute information for the 22 non-annotation layers (entities) is included in this metadata file under the "Entity_and_Attribute_Information" section. Each layer is listed and described in detail under its own heading starting at "Entity_Type_Label." Basic unit information is included in a text document, "RI2006-2_codeset.pdf." 2005 2006 publication date Complete None planned -149.0000 -148.5000 64.1250 64.0000 ISO 19115 Topic Category geoscientificInformation None 40Ar/39Ar Bedrock Geologic Map Coal Geochemical Data Geochronology Geology Igneous Rocks Metamorphic Rocks Palynology Petrography Sedimentary Rocks STATEMAP Project Volcanic Rocks None Alaska, State of Bonnifield Mining District Fairbanks Quadrangle Jumbo Dome Liberty Bell Mine None Healy Creek Formation Keevy Peak Formation Lignite Creek Formation Nenana Gravel Suntrana Formation Totatlanika Schist None Cretaceous Devonian Paleozoic Tertiary This report, map, and/or dataset are available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below). Any hardcopies 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. 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. This project is part of the Alaska Airborne Geophysical/Geological Mineral Inventory Program funded by the Alaska State Legislature and managed by State of Alaska, Department of Natural Resources (DNR), Division of Geological & Geophysical Surveys (DGGS). Partial funding for the geologic mapping, geochronologic dates, and geochemical analyses performed for this project was also provided through the U.S. Geological Survey STATEMAP Program under award number 05HQAG0025 and the State of Alaska's General Fund. Coal energy analyses were provided by the federal National Coal Resource Database System. Microsoft Windows XP SP2, ArcGIS 9.+, and any text editor. Athey, J.E. Werdon, M.B. Newberry, R.J. Szumigala, D.J. Freeman, L.K. Lessard, R.R. 2005 tabular digital data Raw Data File RDF 2005-5 Fairbanks, AK, USA State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys 29 pp. http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=14444 Burns, L.E. Fugro Airborne Surveys Stevens Exploration Management Corp. 2002 tabular digital data, raster digital data, vector digital data Geophysical Report GPR 2002-6 Fairbanks, AK, USA State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys 1 CD-ROM http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=2793 Wahrhaftig, Clyde 1970 Map Geologic Quadrangle Map GQ-810 Washington, DC, USA U.S. Geological Survey 1 sheet, scale 1:63,360 Location data for geologic point data sets were downloaded from Garmin 12XL GPS units into a Microsoft Access database. Field notes were manually entered into the database. Spatial data attributes were either queried directly from the database or attached to the objects using MapInfo Professional 7.5 and ArcGIS 9.1. Attributes were verified for consistency and completeness during the creation of the metadata. Geologic data used in the compilation are the field maps and notes from this project as well as data from other sources as noted in the "Source_Information" section. Topology is present on appropriate polygon and line data sets; others are point data sets. This dataset includes information about geologic units, age sample locations, structural features, structural measurements, dike locations, hornfels locations, pollen sample locations, and coal sample locations. DGGS location data and estimated position errors were downloaded from Garmin 12XL GPS units into an Access database. Sample numbers and locations with selected data were queried from the database or brought into an Excel spreadsheet and then spatially registered and analyzed in MapInfo Professional 7.5 and 8.0. The horizontal positional accuracies of field stations not measured by DGGS are unknown, but methodology presumably varies widely from precise local grid measurements (~20 m error) to less accurate topography and altimeter-style mapping (~100 m error). 15 A value of estimated position error in meters was calculated by the Garmin 12XL units and recorded for each sample location. Estimated position error calculated by the Garmin 12XL units was not less than 3 meters and averaged approximately 6 meters. The GPS system suffers from calculation and geometric error. This error results from items such as error in satellite positions, mathematical error introduced by the formulas used by the GPS unit for calculating position, and errors caused by narrow satellite alignments. Estimated position error is a value determined by the GPS manufacturer for the calculation and geometric error as a whole. "Selective availability," a deliberate degradation of GPS data managed by the U.S. government that induces an additional error of approximately 100 meters to a GPS location, was not in effect during DGGS's 2005 field work. Average potential horizontal error for bedrock geologic map features is estimated to be approximately 15 meters. Bedrock geologic map data have a horizontal positional accuracy dependent on the "on-screen" method of digital cartography. Map error is induced by: (1) transferring map data from base topography to a Mylar compilation map, with an estimated potential error due to a pen line width of approximately 0.001 inches being equivalent to approximately 1.5 meters on the ground; (2) the digitizing RMS error (30 control points on a regular grid have an average RMS error of 14.0 meters on the ground; individual control point error ranges from 2.9 to 24.0 meters on the ground); and (3) the accuracy of the human operator digitizing the geologic line work from the topographic base map, with an estimated error due to a pen line width of approximately 0.001 inches being equivalent to approximately 1.5 meters on the ground. Horizontal positional error for the immediate Liberty Bell Mine area, an area of data which is set into the bedrock map and covered by the inset map (Freeman and others, 1987), is shown below. 17.3 Average digitizing RMS error for the inset (RAA) map is 17.3 meters on the ground. Nine control points selected to georeference the scanned diazo paper blueline copy RAA geologic map (Plate IV, Freeman and others, 1987) were recognizable geologic and cultural features. These features were occupied on the ground and UTM coordinates and estimated position errors were recorded on a Garmin 12XL receiver; estimated position error for the control points ranged from 3.3 to 5.3 meters. Other sources for the original control point errors of up to 24.9 meters include inaccuracies in the compass and tape survey original map, misidentification of geologic features used for the control points, and dimensional changes during source map copy production, storage, and scanning. Burns, L.E. Fugro Airborne Surveys Stevens Exploration Management Corp. 2002 tabular digital data, raster digital data, vector digital data Geophysical Report GPR 2002-6 Fairbanks, AK, USA State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys 1 CD-ROM http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=2793 CD-ROM 2002 publication date Burns and others, 2002 The geophysical datasets in this publication were used throughout the Liberty Bell mapping project. Prior to field work, the geophysical data were used to identify locations of geophysically inferred faults and potential unit boundary locations. Unusual anomalies were noted for follow-up investigation in the field. Printed copies of the geophysical data, overlain by topography, were carried by geologists in the field to help determine the geologic cause for variations in the geophysical data along their traverses. During map compilation, geophysical data were useful for extending mapped contacts and faults through regions covered by vegetation or surficial deposits. Athey, J.E. Werdon, M.B. Newberry, R.J. Szumigala, D.J. Freeman, L.K. Lessard, R.R. 2005 tabular digital data Raw Data File RDF 2005-5 Fairbanks, AK, USA State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys 29 pp. http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=14444 paper 2005 publication date Athey and others, 2005 This report contains major-oxide, minor-oxide, and trace-element geochemical data from rocks collected by DGGS in the Liberty Bell area. These data are used to suggest possible protoliths of metamorphosed and altered rocks, identify types of alteration, and assign trace-element indicated tectonic settings to igneous and meta-igneous rocks. Ore element geochemistry is used to evaluate the mineral-resource potential of the Liberty Bell area. Dusel-Bacon, Cynthia Wooden, J.L. Hopkins, M.J. 2004 document Geological Society of America Bulletin v. 116, n. 7 Boulder, CO, USA Geological Society of America p. 989-1015 paper 2004 publication date Dusel-Bacon and others, 2004 This publication contains age and geochemical data for samples from the Devonian Totatlanika Schist and Keevy Peak Formation. Freeman, L.K. Hanneman, N.L. Flanders, R.W. 1987 tabular digital data, map paper 1987 publication date Freeman and others, 1987 This RAA company report contains a geologic description of the Liberty Bell property, geologic maps, and geochemical data. These data were used to supplement DGGS mapping and interpretations. Geologic detail and structural measurements in the immediate mine area (inset map) are largely from 1:2,400-scale RAA mapping. Leopold, E.B. Liu, Gengwu 1994 document Quaternary International v. 22/23 p. 103-140 paper 1994 publication date Leopold and Liu, 1994 This publication contains pollen sample data and environmental interpretations for the Usibelli Group and Nenana Gravel. These data were compared to pollen counts from this study. Ridgway, K.D. Trop, J.M. Jones, D.E. 1999 document, tabular digital data Journal of Sedimentary Research v. 69, no. 6 p. 1262-1275 paper 1999 publication date Ridgway and others, 1999 This report contains multiple data types and interpretations (pollen, composition, provenance, paleocurrent directions, etc.) for the Suntrana Creek section of the Usibelli Group and Nenana Gravel. These data were compared to data from this study. Triplehorn, D.M. 1976 document Geologic Report GR 52 Fairbanks, AK, USA State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys 14 pp. paper 1976 publication date Triplehorn, 1976 This report contains clay compositions for the Usibelli Group formations in Suntrana Creek. Clay compositions from the study area were compared to these data. Wahrhaftig, Clyde 1970 map Geologic Quadrangle Map GQ-810 1 sheet 63360 paper 1970 publication date Wahrhaftig, 1970 This map contains the only published detailed bedrock geology that covers the study area. This map was used as a reference for the geology and unit descriptions. Wahrhaftig, Clyde 1968 map Bulletin B 1254-E 22 pp. paper 1968 publication date Wahrhaftig, 1968 This publication contains descriptions of the Devonian Totatlanika Schist and Keevy Peak Formation. Rocks in the study area were compared to these descriptions. Wahrhaftig, Clyde Wolfe, J.A. Leopold, E.B. Lanphere, M.A. 1969 document Bulletin B 1274-D p. D1-D30 paper 1969 publication date Wahrhaftig and others, 1969 This publication contains information (composition, paleocurrent directions, pollen, etc.) for the Tertiary Usibelli Group and Nenana Gravel in the Nenana Coal Field. This information was used to interpret data generated from this study and compare data between other areas of the Nenana Coal Field. Yesilyurt, Suleyman 1996 document, tabular digital data p. 1281-1316. A.R. Coyner (ed.) P.L. Fahey (ed.) 1996 document Reno/Sparks, Nevada Geological Society of Nevada April 1995 paper 1996 publication date Yesilyurt, 1996 This report contains detailed information about mineralization and alteration at the Liberty Bell Mine. It also contains age data and compositional data. This information was used to supplement DGGS data related to Liberty Bell mineralization. Field work - During the summer of 2005 DGGS conducted a three-week field mapping project to provide geologic ground truth for an airborne geophysical survey flown in the Liberty Bell area in 2001 (Burns and others, 2002). DGGS efforts are focused on determining the geologic framework of the Liberty Bell area, and its potential for hosting lode mineral deposits. Field work for bedrock investigations, including ridge traverses and examination of riverbank exposures, was conducted for approximately 105 person-days during July 2005. Field notes and rock samples were collected at approximately 1,405 stations throughout the southern Fairbanks A-4 Quadrangle. Plots of an orthorectified air photo mosaic were used to find outcrops in the field and identify linear features that may have geologic significance. Plots of airborne magnetic and resistivity data (Burns and others, 2002) overlain with standard USGS raster topography were used daily in the field to help identify geologic contacts, units, and faults. At most field stations, magnetic susceptibility data were collected to help identify magnetic units. Bedrock mappers recorded observations on 1:50,000-scale topographic base maps of 15-minute quadrangles that were enlarged from a scale of 1:63,360. In the evenings, each geologist's observations were compiled onto a single Mylar base map. Field stations were located using handheld Garmin 12XL GPS units. Field station notes and downloaded GPS location data were entered into a Microsoft Access 2000 database. Burns and others, 2002 U.S. Geological Survey, Digital Raster Graphic (DRG), Fairbanks A-4 2005 Laboratory data - Paleozoic rocks and younger, unmetamorphosed igneous rocks were primarily defined by chemical composition, examination of hand samples, and petrography. Approximately 280 samples were analyzed for major-and minor-oxide and trace elements by a commercial analytical laboratory (Athey and others, 2005) and the University of Alaska Fairbanks (RI 2006-2 text, appendix A). These data are used to suggest possible protoliths of metamorphosed and altered rocks, identify types of alteration, and assign trace-element indicated tectonic settings to igneous and meta-igneous rocks. Unit descriptions are also based on the petrographic examination and modal analysis of 169 thin sections. Six 40Ar/39Ar ages (RI 2006-2 text, table 5; appendix B) were used to constrain timing of igneous events, mineralization, and metamorphism in the Liberty Bell Mine area. (Liberty Bell Mine area is defined as the western, rounded portion of the area outlined on sheet RI 2006-2 as underlain by the subsurface pluton [see "Map Symbols"]; area is outlined in figure "Location Map of the Liberty Bell Mine area and hill VABM Coal" on sheet RI 2006-2. The area coincides with a donut-shaped, aeromagnetic high [Burns and others, 2002]). Tertiary units were differentiated by a combination of sand grain composition, clay composition, and palynology. Sixty grain mounts of Tertiary sand were point-counted (RI 2006-2 text, appendix C) in order to compare sand composition. Clay compositions were determined by X-ray diffraction for sixty-five samples of unconsolidated rock (RI 2006-2 text, appendix D). Pollen was identified and counted in fifteen samples of fine-grained Tertiary sedimentary rock and coal (RI 2006-2 text, appendix E). To evaluate the mineral-resource potential of the Liberty Bell area, 116 samples of visibly mineralized rock, or rock exhibiting features associated with mineralization, were analyzed for geochemical trace elements (Athey and others, 2005). To evaluate the energy-resource potential of the Liberty Bell area, twenty-one coal samples were analyzed for energy values (proximate and ultimate analyses, BTU, etc.) and trace-elements of their ash (RI 2006-2 text, appendix F). The composition of a placer gold sample was determined by X-ray fluorescence (RI 2006-2 text, table 6). Athey and others, 2005 Burns and others, 2002 2006 Digital Cartography - The final compilation of the bedrock geologic map data on Mylar and the RAA Liberty Bell Mine map (Freeman and others, 1987) were scanned as high-resolution tiff files. The files were imported into MapInfo Professional 8.0, and geographically registered in UTM coordinates (see spatial reference information section below). Geologic unit polygons were digitized 'on-screen' by tracing geologic contacts; each polygon was attributed with appropriate supporting information. The geologic polygon and polyline layers were imported into ArcGIS 9.1 geodatabase format using ArcCatalog 9.1. Spatially registered point data for the map were made in MapInfo Professional 8.0 from Microsoft Excel and Access 2000 files and converted into ArcGIS 9.1 geodatabase format using ArcCatalog 9.1. Editing and quality control checks took place at every process step. Final geologic feature and attribute editing was completed in ArcGIS 9.1. Map text was created in Microsoft Word 2000. Final map layout, editing, and printing were accomplished using CorelDRAW 10.0. U.S. Geological Survey, Digital Raster Graphic (DRG), Fairbanks A-4 Freeman and others, 1987 2006 Universal Transverse Mercator 6 0.999600 -147.00000 0 500000 0 coordinate pair 0.000064 0.000064 meters ArAr Universal Transverse Mercator 6 0.999600 -147.00000 0 500000 0 coordinate pair 0.000064 0.000064 meters border Universal Transverse Mercator 6 0.999600 -147.00000 0 500000 0 coordinate pair 0.000064 0.000064 meters clinker Universal Transverse Mercator 6 0.999600 -147.00000 0 500000 0 coordinate pair 0.000064 0.000064 meters coal Universal Transverse Mercator 6 0.999600 -147.00000 0 500000 0 coordinate pair 0.000064 0.000064 meters contacts Universal Transverse Mercator 6 0.999600 -147.00000 0 500000 0 coordinate pair 0.000064 0.000064 meters dikepoints Universal Transverse Mercator 6 0.999600 -147.00000 0 500000 0 coordinate pair 0.000064 0.000064 meters dikes_oriented_point Universal Transverse Mercator 6 0.999600 -147.00000 0 500000 0 coordinate pair 0.000064 0.000064 meters dikes_oriented_polyline Universal Transverse Mercator 6 0.999600 -147.00000 0 500000 0 coordinate pair 0.000064 0.000064 meters faultsymbol Universal Transverse Mercator 6 0.999600 -147.00000 0 500000 0 coordinate pair 0.000064 0.000064 meters foldaxes Universal Transverse Mercator 6 0.999600 -147.00000 0 500000 0 coordinate pair 0.000064 0.000064 meters subsurfacepluton Universal Transverse Mercator 6 0.999600 -147.00000 0 500000.0 0 coordinate pair 0.000064 0.000064 meters foldsymbol Universal Transverse Mercator 6 0.9996 -147.00000 0 500000.0 0 coordinate pair 0.000064 0.000064 meters hornfels Universal Transverse Mercator 6 0.9996 -147.00000 0 500000.0 0 coordinate pair 0.000064 0.000064 meters INSET_border Universal Transverse Mercator 6 0.9996 -147.00000 0 5000000.0 0 coordinate pair 0.000064 0.000064 meters INSET_foldaxes Universal Transverse Mercator 6 0.9996 -147.00000 0 500000.0 0 coordinate pair 0.000064 0.000064 meters INSET_RAAstructurepoints Universal Transverse Mercator 6 0.9996 -147.00000 0 500000.0 0 coordinate pair 0.000064 0.000064 meters metadikes Universal Transverse Mercator 6 0.9996 -147.00000 0 500000.0 0 coordinate pair 0.000064 0.000064 meters paly Universal Transverse Mercator 6 0.9996 -147.00000 0 500000.0 0 coordinate pair 0.000064 0.000064 meters polygons Universal Transverse Mercator 6 0.9996 -147.00000 0 500000.0 0 coordinate pair 0.000064 0.000064 meters structurepoints Universal Transverse Mercator 6 0.9996 -147.00000 0 500000.0 0 coordinate pair 0.000064 0.000064 meters xsection Universal Transverse Mercator 6 0.9996 -147.00000 0 500000.0 0 coordinate pair 0.000064 0.000064 meters subsurfaceplutonsymbol North American Datum of 1927 Clarke 1866 6378206.4 294.978698 ArAr.shp Point locations for Ar-Ar radiometric age samples, table contains 7 objects Alaska Division of Geological & Geophysical Surveys ArAr STATIONNO Generic example of unique sample identifier: YearAAA999X: Year=4 digits of year of sample collection, AAA=geologist's initials (one to three characters), 999=unique station number, X=unique alpha character designating a sample was taken at the field station. Geologists' initials are: JEA - Jennifer Athey, LF - Lawrence Freeman, MBW - Melanie Werdon, RN - Rainer Newberry, Z - Dave Szumigala. Alaska Division of Geological & Geophysical Surveys Unique sample identifier EASTING Easting UTM Zone 6, NAD 27 (see Spatial_Reference_Information) 404906 425415 meters NORTHING Northing UTM Zone 6, NAD 27 (see Spatial_Reference_Information) 7097762 7109006 meters ArAr_Anno Unique label identifying a sample location on the map Alaska Division of Geological & Geophysical Surveys Unique sample identifier, one blank value is not represented on the map Lithology Lithology from which the sample was taken Alaska Division of Geological & Geophysical Surveys Brief description of the sample lithology border.shp Polygon outlining the Liberty Bell map area, table contains one object, table contains no attributes Alaska Division of Geological & Geophysical Surveys border clinker.shp Polygons outlining areas of burned coal and coal-fired sedimentary rocks, table contains 19 objects, table contains no attributes Alaska Division of Geological & Geophysical Surveys clinker coal.shp Point locations for coal data, table contains 21 objects Alaska Division of Geological & Geophysical Surveys coal STATIONNO Generic example of unique sample identifier: YearAAA999X: Year=4 digits of year of sample collection, AAA=geologist's initials (one to three characters), 999=unique station number, X=unique alpha character designating a sample was taken at the field station. Geologists' initials are: JEA - Jennifer Athey, LF - Lawrence Freeman, MBW - Melanie Werdon, RN - Rainer Newberry, Z - Dave Szumigala. Alaska Division of Geological & Geophysical Surveys Unique sample identifier EASTING Easting UTM Zone 6, NAD 27 (see Spatial_Reference_Information) 413860 422738 meters NORTHING Northing UTM Zone 6, NAD 27 (see Spatial_Reference_Information) 7098584 7111956 meters COMMENTS Description of sample locality Alaska Division of Geological & Geophysical Surveys Description of sample locality COAL_ANNO Unique label identifying a sample location on the map Alaska Division of Geological & Geophysical Surveys Unique sample identifier contacts.shp Polylines for metamorphic-stratigraphic, intrusive, and fault contacts, table contains 776 objects Alaska Division of Geological & Geophysical Surveys contacts linetype Type of contact Alaska Division of Geological & Geophysical Surveys boundary Line segment of the map border Alaska Division of Geological & Geophysical Surveys concealed fault Fault covered by Quaternary and/or Tertiary units Alaska Division of Geological & Geophysical Surveys contact Metamorphic-stratigraphic or intrusive contacts Alaska Division of Geological & Geophysical Surveys fault High-angle fault Alaska Division of Geological & Geophysical Surveys fault gp queried Fault inferred from geophysical data (Burns and others, 2002), where its existence or location is uncertain Alaska Division of Geological & Geophysical Surveys inferred fault Fault interpreted from aerial photography and (or) geophysical data (Burns and others, 2002) Alaska Division of Geological & Geophysical Surveys questionable fault Fault where significant motion is unknown or location is unknown or uncertain Alaska Division of Geological & Geophysical Surveys uncertain contact Contact where location is uncertain Alaska Division of Geological & Geophysical Surveys dikepoints.shp Point locations for unmetamorphosed dikes, table contains 52 objects, symbolized by composition Alaska Division of Geological & Geophysical Surveys dikepoints STATION Generic example of unique sample identifier: YearAAA999X: Year=4 digits of year of sample collection, AAA=geologist's initials (one to three characters), 999=unique station number, X=unique alpha character designating a sample was taken at the field station. Geologists' initials are: JEA - Jennifer Athey, LF - Lawrence Freeman, MBW - Melanie Werdon, RN - Rainer Newberry, Z - Dave Szumigala. Alaska Division of Geological & Geophysical Surveys Unique sample identifier EASTING Easting UTM Zone 6, NAD 27 (see Spatial_Reference_Information) 403538 425195 meters NORTHING Northing UTM Zone 6, NAD 27 (see Spatial_Reference_Information) 7098018 7111450 meters TYPE Orientation of intrusion with respect to host rock, dike versus sill Alaska Division of Geological & Geophysical Surveys Description of sample locality ? Orientation of intrusion is unknown Alaska Division of Geological & Geophysical Surveys dike Intrusion is oriented at an angle to the foliation of its host rock Alaska Division of Geological & Geophysical Surveys sill? Intrusion may be oriented parallel to the foliation of its host rock Alaska Division of Geological & Geophysical Surveys NAME Description of lithology Alaska Division of Geological & Geophysical Surveys Description of lithology MAP_ABBREV Unit abbreviation associated with dike Alaska Division of Geological & Geophysical Surveys RI2006-2_codeset.pdf Alaska Division of Geological & Geophysical Surveys (http://www.dggs.dnr.state.ak.us/metadata/RI2006-2_codeset.pdf) dikes_oriented_point.shp Point locations showing strike or trend of unmetamorphosed dikes, table contains 17 objects Alaska Division of Geological & Geophysical Surveys dikes_oriented_point STATION Generic example of unique sample identifier: YearAAA999X: Year=2 digit year of sample collection, AAA=geologist's initials (one to three characters), 999=unique station number, X=unique alpha character designating a sample was taken at the field station. Geologists' initials are: JEA - Jennifer Athey, LF - Lawrence Freeman, MBW - Melanie Werdon, RN - Rainer Newberry, Z - Dave Szumigala. Alaska Division of Geological & Geophysical Surveys Unique sample identifier EASTING Easting UTM Zone 6, NAD 27 (see Spatial_Reference_Information) 404906 424440 meters NORTHING Northing UTM Zone 6, NAD 27 (see Spatial_Reference_Information) 7101536 7106648 meters TYPE Orientation of intrusion with respect to host rock, dike versus sill Alaska Division of Geological & Geophysical Surveys Description of sample locality ? Orientation of intrusion is unknown Alaska Division of Geological & Geophysical Surveys dike Intrusion is oriented at an angle to the foliation of its host rock Alaska Division of Geological & Geophysical Surveys sill? Intrusion may be oriented parallel to the foliation of its host rock Alaska Division of Geological & Geophysical Surveys STRIKE Angle of strike or trend of dike, strike and dip recorded using "right-hand rule"; trend recorded where dip is not measurable; trend recorded in horizontal plane of dip-direction Alaska Division of Geological & Geophysical Surveys 10 345 degrees DIP Dip of the dike (if known). Strike and dip recorded using "right-hand rule". "0" degrees refers to dikes without measured dip; there are no horizontal sills in this dataset. Alaska Division of Geological & Geophysical Surveys 0 90 degrees NAME Description of lithology Alaska Division of Geological & Geophysical Surveys Description of lithology MAP_ABBREV Unit abbreviation associated with dike Alaska Division of Geological & Geophysical Surveys RI2006-2_codeset.pdf Alaska Division of Geological & Geophysical Surveys (http://www.dggs.dnr.state.ak.us/metadata/RI2006-2_codeset.pdf) dikes_oriented_polyline.shp Polyline showing dike location, table contains 1 object Alaska Division of Geological & Geophysical Surveys dikes_oriented_polyline NAME Description of lithology Alaska Division of Geological & Geophysical Surveys Description of lithology faultsymbol.shp symbols and text point locations depicting fault information and relative fault movement, table contains 71 objects Alaska Division of Geological & Geophysical Surveys faultsymbol TEXTSTRING Map text for fault plane relative movement, named faults, and queried faults; blank where no text is required Alaska Division of Geological & Geophysical Surveys D Down-thrown side of fault Alaska Division of Geological & Geophysical Surveys U Up-thrown side of fault Alaska Division of Geological & Geophysical Surveys Eva Creek Fault Eva Creek Fault Alaska Division of Geological & Geophysical Surveys ? Location or continuation of fault is unknown Alaska Division of Geological & Geophysical Surveys Symbol Map symbol for fault plane relative movement; blank where no map symbol is required Alaska Division of Geological & Geophysical Surveys right lateral Right-lateral movement Alaska Division of Geological & Geophysical Surveys left lateral Left-lateral movement Alaska Division of Geological & Geophysical Surveys Detailed_Description: foldaxes.shp polylines following axial traces of major folds, table contains 55 objects Alaska Division of Geological & Geophysical Surveys foldaxes TYPE Type of fold Alaska Division of Geological & Geophysical Surveys Antiform Antiform Alaska Division of Geological & Geophysical Surveys Antiform? Possible antiform Alaska Division of Geological & Geophysical Surveys concealed synform Synform covered by Tertiary units Alaska Division of Geological & Geophysical Surveys Interp Synform Synform interpreted from aerial photography or long-distance observation Alaska Division of Geological & Geophysical Surveys Interp Antiform Antiform interpreted from aerial photography or long-distance observation Alaska Division of Geological & Geophysical Surveys Synform Synform Alaska Division of Geological & Geophysical Surveys Synform? Possible synform Alaska Division of Geological & Geophysical Surveys Detailed_Description: foldsymbol.shp Symbols and text point locations showing fold types and orientations, table contains 77 objects Alaska Division of Geological & Geophysical Surveys foldsymbol TEXTSTRING Map text and symbols for fold types, orientations, and queried folds Alaska Division of Geological & Geophysical Surveys ? Location or continuation of fold axis is unknown Alaska Division of Geological & Geophysical Surveys antiform Antiform Alaska Division of Geological & Geophysical Surveys inset antiform Antiform that appears only in the inset map Alaska Division of Geological & Geophysical Surveys inset plunge ar Arrow showing direction of fold plunge, appears only in the inset map Alaska Division of Geological & Geophysical Surveys inset synform Synform that appears only in the inset map Alaska Division of Geological & Geophysical Surveys Plunge arrow Arrow showing direction of fold plunge Alaska Division of Geological & Geophysical Surveys synform Synform Alaska Division of Geological & Geophysical Surveys synform? Possible synform Alaska Division of Geological & Geophysical Surveys hornfels.shp Polygons outlining areas of hornfels and metasomatic alteration, table contains 26 objects Alaska Division of Geological & Geophysical Surveys hornfels ID Type of polygon Alaska Division of Geological & Geophysical Surveys hornfels Locations of hornfels and metasomatic alteration Alaska Division of Geological & Geophysical Surveys INSET_border.shp Polygon outlining the inset map area, table contains 1 object Alaska Division of Geological & Geophysical Surveys INSET_border Type Type of polygon Alaska Division of Geological & Geophysical Surveys border Location of inset map area Alaska Division of Geological & Geophysical Surveys INSET_foldaxes.shp Polylines on the inset map following axial traces of folds, table contains 8 objects Alaska Division of Geological & Geophysical Surveys INSET_foldaxes TYPE Type of fold Alaska Division of Geological & Geophysical Surveys antiform Antiform Alaska Division of Geological & Geophysical Surveys synform Synform Alaska Division of Geological & Geophysical Surveys INSET_RAAstructurepoints.shp Point locations of RAA structural measurements (Freeman and others, 1987), table contains 234 objects Alaska Division of Geological & Geophysical Surveys INSET_RAAstructurepoints ANGLE Strike of plane in "right-hand rule", where north is 0 and degrees increase clockwise to 359 degrees Alaska Division of Geological & Geophysical Surveys 0 359 degrees DIP Degrees that a plane is inclined relative to horizontal, horizontal being 0 degrees, vertical being 90 degrees; always 90 degrees clockwise from strike Alaska Division of Geological & Geophysical Surveys 0 90 degrees ID Type of structure measurement to plot, to which the orientation data apply Alaska Division of Geological & Geophysical Surveys fault Fault, measurement from major fault in contacts table Alaska Division of Geological & Geophysical Surveys fault com Minor fault, measurement from probable minor fault, not associated with a fault in the contacts table Alaska Division of Geological & Geophysical Surveys fold axis Minor fold axis Alaska Division of Geological & Geophysical Surveys foliation Foliation Alaska Division of Geological & Geophysical Surveys h foliation Horizontal foliation Alaska Division of Geological & Geophysical Surveys joint joint Alaska Division of Geological & Geophysical Surveys noshow Structural measurement not shown on the inset map, see attribute "structure" for the type of measurement Alaska Division of Geological & Geophysical Surveys v joint vertical joint Alaska Division of Geological & Geophysical Surveys vein vein Alaska Division of Geological & Geophysical Surveys REMARKS Description of measurement or lithology Alaska Division of Geological & Geophysical Surveys Description of measurement or lithology EAST UTM Zone 6, NAD 27 (see Spatial_Reference_Information) Alaska Division of Geological & Geophysical Surveys -148.87379 -148.84285 degrees NORTH UTM Zone 6, NAD 27 (see Spatial_Reference_Information) Alaska Division of Geological & Geophysical Surveys 64.0444 64.05839 degrees Structure Type of structure measurement, to which the orientation data apply, not all of these data are plotted on the inset map Alaska Division of Geological & Geophysical Surveys fault Fault, measurement from major fault in contacts table Alaska Division of Geological & Geophysical Surveys fault com Minor fault, measurement from probable minor fault, not associated with a fault in the contacts table Alaska Division of Geological & Geophysical Surveys fold axis Minor fold axis Alaska Division of Geological & Geophysical Surveys foliation Foliation Alaska Division of Geological & Geophysical Surveys h foliation Horizontal foliation Alaska Division of Geological & Geophysical Surveys joint joint Alaska Division of Geological & Geophysical Surveys v joint vertical joint Alaska Division of Geological & Geophysical Surveys v vein Vertical vein Alaska Division of Geological & Geophysical Surveys vein vein Alaska Division of Geological & Geophysical Surveys metadikes.shp Point locations for metamorphosed dikes, table contains 28 objects, symbolized by composition Alaska Division of Geological & Geophysical Surveys metadikes SAMPNO Generic example of unique sample identifier: YearAAA999X: Year=4 digits of year of sample collection, AAA=geologist's initials (one to three characters), 999=unique station number, X=unique alpha character designating a sample was taken at the field station. Geologists' initials are: JEA - Jennifer Athey, LF - Lawrence Freeman, MBW - Melanie Werdon, RN - Rainer Newberry, Z - Dave Szumigala. Alaska Division of Geological & Geophysical Surveys Unique sample identifier EASTING Easting UTM Zone 6, NAD 27 (see Spatial_Reference_Information) 405785 426621 meters NORTHING Northing UTM Zone 6, NAD 27 (see Spatial_Reference_Information) 7099694 7111652 meters TYPE Type of lithology Alaska Division of Geological & Geophysical Surveys RI2006-2_codeset.pdf Alaska Division of Geological & Geophysical Surveys (http://www.dggs.dnr.state.ak.us/metadata/RI2006-2_codeset.pdf) paly.shp Point locations for pollen data, table contains 15 objects Alaska Division of Geological & Geophysical Surveys paly SAMPNO Generic example of unique sample identifier: YearAAA999X: Year=4 digits of year of sample collection, AAA=geologist's initials (one to three characters), 999=unique station number, X=unique alpha character designating a sample was taken at the field station. Geologists' initials are: JEA - Jennifer Athey, LF - Lawrence Freeman, MBW - Melanie Werdon, RN - Rainer Newberry, Z - Dave Szumigala. Two Alaska Division of Geological & Geophysical Surveys Unique sample identifier EASTING Easting UTM Zone 6, NAD 27 (see Spatial_Reference_Information) 405456 424592 meters NORTHING Northing UTM Zone 6, NAD 27 (see Spatial_Reference_Information) 7098096 7111956 meters POL_ANNO Unique label identifying a sample location on the map Alaska Division of Geological & Geophysical Surveys Unique sample identifier Lithology Short description of sample lithology Alaska Division of Geological & Geophysical Surveys coal Coal Alaska Division of Geological & Geophysical Surveys shale Shale Alaska Division of Geological & Geophysical Surveys siltstone Siltstone Alaska Division of Geological & Geophysical Surveys silty sandstone Silty sandstone Alaska Division of Geological & Geophysical Surveys polygons.shp Polygons outlining bedrock units, table contains 270 objects Alaska Division of Geological & Geophysical Surveys polygons UNIT Bedrock unit labels Alaska Division of Geological & Geophysical Surveys RI2006-2_codeset.pdf Alaska Division of Geological & Geophysical Surveys (http://www.dggs.dnr.state.ak.us/metadata/RI2006-2_codeset.pdf) structurepoints.shp Point locations of structural measurements, table contains 788 objects Alaska Division of Geological & Geophysical Surveys structurepoints STATIONNO Generic example of unique sample identifier: YearAAA999X: Year=4 digit year of sample collection, AAA=geologist's initials (one to three characters), 999=unique station number, X=unique alpha character designating a sample was taken at the field station. Geologists' initials are: JEA - Jennifer Athey, LF - Lawrence Freeman, MBW - Melanie Werdon, RN - Rainer Newberry, Z - Dave Szumigala. Alaska Division of Geological & Geophysical Surveys Unique sample identifier. Two blank values are fault measurements from Freeman and others (1987); values "air photo" indicate structure data interpreted from aerial photographs. EASTING Easting UTM Zone 6, NAD 27 (see Spatial_Reference_Information) 402492 426708 meters NORTHING Northing UTM Zone 6, NAD 27 (see Spatial_Reference_Information) 7097691 7112149 meters ID Type of structural measurement Alaska Division of Geological & Geophysical Surveys air photo Bedding measurement interpreted from aerial photography Alaska Division of Geological & Geophysical Surveys axial plane Minor axial plane of isoclinal and open folds, outcrop and suboutcrop scale Alaska Division of Geological & Geophysical Surveys bedding Fault, measurement from major fault in contacts table Alaska Division of Geological & Geophysical Surveys fault Fault, measurement from major fault in contacts table Alaska Division of Geological & Geophysical Surveys fold axis Minor fold axis, outcrop and suboutcrop scale Alaska Division of Geological & Geophysical Surveys foliation Foliation Alaska Division of Geological & Geophysical Surveys h bedding Horizontal bedding Alaska Division of Geological & Geophysical Surveys h foliation Horizontal foliation Alaska Division of Geological & Geophysical Surveys obs fol Foliation observed from a distance, STATIONNO is the station from which the observation was made Alaska Division of Geological & Geophysical Surveys v fault Vertical fault Alaska Division of Geological & Geophysical Surveys v foliation Vertical foliation Alaska Division of Geological & Geophysical Surveys TREND Angle of strike or trend. strike and dip recorded using "right-hand rule"; trend recorded in horizontal plane of dip-direction Alaska Division of Geological & Geophysical Surveys 0 359 degrees DIP Dip or plunge (if known). Strike and dip recorded using "right-hand rule". Fold axis with "0" degree dip means dip was not measured. Alaska Division of Geological & Geophysical Surveys 0 90 degrees subsurfacepluton.shp Polyline showing extent of subsurface pluton as determined by the presence of hornfels, intrusions, alteration, and aeromagnetic highs (Burns and others, 2002). Table contains 7 objects, table contains no attributes Alaska Division of Geological & Geophysical Surveys subsurfacepluton subsurfaceplutonsymbol.shp Point locations related to the subsurface pluton, table contains 2 objects Alaska Division of Geological & Geophysical Surveys subsurfaceplutonsymbol TEXTSTRING Point locations for query symbols Alaska Division of Geological & Geophysical Surveys pluton queried Location or continuation of subsurface pluton trace is unknown Alaska Division of Geological & Geophysical Surveys xsection.shp Polyline trace of the cross section, table contains 1 object Alaska Division of Geological & Geophysical Surveys xsection NAME Name of the cross section Alaska Division of Geological & Geophysical Surveys AA' Cross section A to A' Alaska Division of Geological & Geophysical Surveys State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys Natural Resource Technician mailing and physical

3354 College Road

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3354 College Road

Fairbanks AK 99709-3707 USA 907-451-5010 None available. 907-451-5050 dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays. Please contact us through the e-mail address above whenever possible. FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 none 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 State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys.