Geologic map of the Chulitna region, southcentral Alaska

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What does this data set describe?

Title: Geologic map of the Chulitna region, southcentral Alaska
Abstract:
This map is the result of field investigations by DGGS in 1997 and 1998. This geologic map and report supersede the previously released Public Data File 99-24B, Preliminary interpretive bedrock geologic map of the Healy A-6 Quadrangle, southcentral Alaska. The current map has been updated to include mapping of areas adjacent to the Healy A-6 Quadrangle, newly interpreted bedrock units based on newly acquired analytical, paleontologic, and Ar40/Ar39 data. Ages for the rock units were modified. Field investigations were part of a two-year mapping program to provide geologic ground truth for airborne geophysical surveys flown by DGGS in the Chulitna region of southcentral Alaska during 1996.
Supplemental_Information:
The layers listed below are present as ArcGIS shape files. Attribute information for the following 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 "Entity_Type_Label." Basic unit information is also included in the unit code set file "RI2001-1_codeset.pdf." Layers include:
chu_allsrfgeo_arc     surficial geologic unit boundaries (arc)
chu_allsrfgeo_polygon     surficial geologic units (polygon)
chubedcomp_arc     bedrock geologic unit boundaries (arc)
chubedcomp_polygon     bedrock geologic units (polygon)
chucompstrsym_point     points for the strike, dip, and plunge of bedding planes, foliation, and various lineaments
chudikecomp_arc     vector lines for dikes of undifferentiated composition
chufoldcomp_arc     types of folds, anticlines, synclines, or lines depicting a cross-section
chufoldcomp_point     fold, anticline, syncline, or cross-section symbols
chuhflscomp_arc     hornfels unit boundaries (arc)
chuhflscomp_polygon     hornfels units (polygon)
chusample_point     point data indicating the location of felsic dikes
chustructcomp_arc     vector lines for types of faults
  1. How should this data set be cited?

    Clautice, K.H., Newberry, R.J., Pinney, D.S., Blodgett, R.B., Bundtzen, T.K., Gage, B.G., Harris, E.E., Liss, S.A., Miller, M.L., Reifenstuhl, R.R., and Clough, J.G., 2001, Geologic map of the Chulitna region, southcentral Alaska: Report of Investigation RI 2001-1B, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, Alaska - USA.

    Online Links:

    Other_Citation_Details: 32 p., 1 sheet, scale 1:63,360

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -150.032
    East_Bounding_Coordinate: -149.113
    North_Bounding_Coordinate: 63.3044
    South_Bounding_Coordinate: 62.9604

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 1997
    Ending_Date: 2001
    Currentness_Reference: publication date

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: report, tabular digital data, map, vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

    2. What coordinate system is used to represent geographic features?

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 6
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -147.000
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000
      False_Northing: 0.0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.000128
      Ordinates (y-coordinates) are specified to the nearest 0.000128
      Planar coordinates are specified in meters

      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.978698.

  7. How does the data set describe geographic features?

    chu_allsrfgeo_arc.shp
    Object type is vector, there are 3849 rows associated with this entity, and the entity values refer to surficial geologic map unit contacts. (Source: Alaska Division of Geological & Geophysical Surveys)

    CODE
    Line symbol for surficial geologic map unit contacts (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    6Contact, approximately located

    chu_allsrfgeo_polygon.shp
    Object type is vector, there are 1604 rows associated with this entity, and the entity values refer to surficial geologic map units. (Source: Alaska Division of Geological & Geophysical Surveys)

    UNIT
    Surficial map unit labels, any unit ending with a "?" indicates uncertainty (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    bUndifferentiated bedrock
    bcThinly covered bedrock
    lakeLake
    glacierGlacier

    Formal codeset
    Codeset Name:RI2001-1_codeset.pdf
    Codeset Source:Alaska Division of Geological & Geophysical Surveys <http://www.dggs.dnr.state.ak.us/metadata/RI2001-1_codeset.pdf>

    X-COORD
    X-coordinate (Source: ESRI, Arc command "addxy", numeric coordinates defining feature location)

    Range of values
    Minimum:0
    Maximum:393398.2
    Units:meters

    Y-COORD
    Y-coordinate (Source: ESRI, Arc command "addxy", numeric coordinates defining feature location)

    Range of values
    Minimum:0
    Maximum:7021089
    Units:meters

    SUNIT
    Surficial map unit labels, indicates source of the unit name is from the Surficial-geologic map of the Chulitna region, southcentral Alaska (RI 2001-1C). Any unit ending with a "?" indicates uncertainty (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    bUndifferentiated bedrock
    bcThinly covered bedrock
    lakeLake
    glacierGlacier

    Formal codeset
    Codeset Name:RI2001-1_codeset.pdf
    Codeset Source:Alaska Division of Geological & Geophysical Surveys <http://www.dggs.dnr.state.ak.us/metadata/RI2001-1_codeset.pdf>

    SURFBED
    Code designator to distinguish areas of surficial deposits from areas of bedrock deposits (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    SSurficial deposit
    BBedrock deposit, including exposed and thinly-covered units

    JUSTBED
    Map unit labels in which all exposed bedrock and thinly covered bedrock are combined into a single bedrock unit, whereas the surficial-geologic deposits retain their original unit designations. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    BXUndifferentiated bedrock and thinly covered bedrock
    lakeLake
    glacierGlacier

    Formal codeset
    Codeset Name:RI2001-1_codeset.pdf
    Codeset Source:Alaska Division of Geological & Geophysical Surveys <http://www.dggs.dnr.state.ak.us/metadata/RI2001-1_codeset.pdf>

    chubedcomp_arc.shp
    Object type is vector, there are 397 rows associated with this entity, and the entity values refer to bedrock geologic map unit boundaries. (Source: Alaska Division of Geological & Geophysical Surveys)

    CODE
    Line symbols for contacts, defined as boundaries between geologic formations or other rock units. (Source: Alaska Division of Geological & Geophysical Surveys, Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    0Hidden line, defines the polygon boundary, but is not displayed on the map for aesthetic purposes
    4Bounding box
    7Contact inferred
    11Fault
    12***Note: the polygon having the software-defined attribute/column FID whose value is 318 should have a value of "11", corresponding to a line depicting a fault.***

    chubedcomp_polygon.shp
    Object type is vector, there are 189 rows associated with this entity, and the entity values refer to bedrock geologic map unit polygons. (Source: Alaska Division of Geological & Geophysical Surveys)

    UNIT
    Geologic bedrock map unit labels, any unit ending with a "?" indicates uncertainty (Source: Alaska Division of Geological & Geophysical Surveys, Alaska Division of Geological & Geophysical Surveys)

    Formal codeset
    Codeset Name:RI2001-1_codeset.pdf
    Codeset Source:Alaska Division of Geological & Geophysical Surveys <http://www.dggs.dnr.state.ak.us/metadata/RI2001-1_codeset.pdf>

    CODE
    Line symbols for contacts, defined as boundaries between geologic formations or other rock units. (Source: Alaska Division of Geological & Geophysical Surveys, Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    0hidden line, defines the polygon boundary, but is not displayed on the map for aesthetic purposes

    chuhflscomp_polygon.shp
    Object type is vector, there are 35 rows associated with this entity, and the entity values refer to zones of hornfels (stipple) and inferred serpentinite (hatchure) (Source: Alaska Division of Geological & Geophysical Surveys)

    UNIT
    bedrock map unit labels (Source: Alaska Division of Geological & Geophysical Surveys, Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    Amh1Region associated with the unit "sp*", serpentinite near the surface, and is interpreted from aeromagnetic signatures
    HFLSHornfels are very dark gray to black, very fine to fine grained, hard, dense rocks with common disoriented crystals or rosettes of muscovite, biotite, and locally andalusite. Typically formed by contact metamorphism.

    Formal codeset
    Codeset Name:RI2001-1_codeset.pdf
    Codeset Source:Alaska Division of Geological & Geophysical Surveys <http://www.dggs.dnr.state.ak.us/metadata/RI2001-1_codeset.pdf>

    chuhflscomp_arc.shp
    Object type is vector, there are 35 rows associated with this entity, and the entity values refer to boundaries of hornfels (stipple) and inferred serpentinite (hatchure) (Source: Alaska Division of Geological & Geophysical Surveys)

    CODE
    Line symbols for contacts, defined as boundaries between geologic formations or other rock units. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    0hidden line, defines the polygon boundary, but is not displayed on the map for aesthetic purposes
    5contact
    7contact, inferred

    chustructcomp_arc.shp
    Object type is vector, there are 316 rows associated with this entity, and the entity values refer to types of faults. (Source: Alaska Division of Geological & Geophysical Surveys)

    CODE
    Line style coding of fault traces. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    11fault
    13inferred fault
    19thrust fault, sawteeth on upper plate, user will need to see the Geologic Map of the Chulitna Region, Southcentral Alaska (Publication RI 2001-1A) for interpretation of relative plate motion
    23inferred thrust fault

    QMQA
    Quadrangle boundary (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    0hidden line, defines the polygon boundary, but is not displayed on the map for aesthetic purposes

    chucompstrsym_point.shp
    Object type is point, there are 1102 rows associated with this entity, and the entity values refer to symbols for folds, anticlines, synclines, and bedding features (Source: Alaska Division of Geological & Geophysical Surveys)

    CODE
    Not known. (Source: Alaska Division of Geological & Geophysical Surveys)

    Value assigned 1-782

    STATION
    Generic example of unique sample identifier or location of a geologic measurement: YrAAA999X: Yr=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: AM - Unknown, BG - B. Gage, BO - Unknown, BT - Unknown, DP - D. Pinney, JC - J. Clough, HA - Unknown, KC - K. Clautice, RB - R. Blodgett, RN - R. Newberry, RR - R. Reifenstuhl, SH - S. Haug, SL - S. Liss, SS - Unknown, MW - M. Werdon. (Source: Alaska Division of Geological & Geophysical Surveys)

    Unique sample number designated by the author(s).

    LONG
    Longitude of sample location (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:-150.02588
    Maximum:-149.11703
    Units:degrees

    LAT
    Latitude of sample location (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:62.96763
    Maximum:63.28582
    Units: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 (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:6
    Maximum:90
    Units:degrees

    ANGLE
    Strike of plane using "Right-hand rule," where north is 0 and degrees increase clockwise to 360, always 90 degrees counter-clockwise from dip direction (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:1
    Maximum:360
    Units:degrees

    CLOCK
    360 minus the strike of plane using "Right-hand rule" (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:0
    Maximum:359
    Units:degrees

    COUNTER
    Same as the strike of plane using "Right-hand rule" (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:1
    Maximum:360
    Units:degrees

    TYPE
    Not known. (Source: Alaska Division of Geological & Geophysical Surveys)

    Value assigned 0, 1, 3, 4, 5

    CODE
    Point symbols for types of bedding and foliation orientation data (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    1Strike and dip direction of beds
    3Strike and dip direction of beds, top of beds known from sedimentary features
    4Strike and dip direction of overturned beds
    5Strike of vertical beds, stratigraphic tops to north
    9Strike and dip direction of foliation
    10Strike of vertical foliation
    12Strike and dip direction of cleavage
    13Strike of vertical cleavage
    19Strike and dip direction of joints
    20Strike of vertical joints

    SHOW
    Indicates whether or not the point is printed on the published paper map (Source: Alaska Division of Geological & Geophysical Surveys)

    "Yes" - The point is printed or shown on the Geologic map of the Chulitna region, southcentral Alaska (Publication RI 2001-1B-SH1). "No" - The point is not printed or shown on the Geologic map of the Chulitna region, southcentral Alaska (Publication RI 2001-1B-SH1). A value of "No" may indicate that a duplicate value was measured nearby or the point was simply omitted at the discretion of the author(s).

    chudikecomp_arc.shp
    Object type is vector, there are 57 rows associated with this entity, and the entity values refer to dikes of undifferentiated composition (Source: Alaska Division of Geological & Geophysical Surveys)

    CODE
    Line symbols for dikes (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    57dikes

    chufoldcomp_point.shp
    Object type is point, there are 26 rows associated with this entity, and the entity values refer to types of anticlines or synclines (Source: Alaska Division of Geological & Geophysical Surveys)

    CODE
    Point symbols for types of folds, anticlines, or synclines (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    26overturned syncline, showing direction of dip of limbs
    27overturned anticline, showing direction of dip of limbs

    chufoldcomp_arc.shp
    Object type is vector, there are 37 rows associated with this entity, and the entity values refer to line types for anticlines, synclines, and contacts (Source: Alaska Division of Geological & Geophysical Surveys)

    CODE
    Line symbols for types of folds, anticlines, synclines, or contacts (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    0hidden line, defines the polygon boundary, but is not displayed on the map for aesthetic purposes
    5contact
    34fold axis, anticline or syncline

    chusample_point.shp
    Object type is vector, there are 70 rows associated with this entity, and the entity values refer to types of rock suites or measured section location (Source: Alaska Division of Geological & Geophysical Surveys)

    CODE
    Point symbols used to define rock suite types or measured section locations (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    32filled triangle, Tertiary suite
    34filled circle, Cretaceous suite
    64open circle, measured section shown as figure in accompanying text report
    75filled diamond, Cretaceous suite (altered)
    76half-filled square, Cretaceous suite (probable)


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    The Chulitna project is part of DGGS's Airborne Geophysical and Geological Mineral Inventory project (AGGMI), a special multi-year investment by the State of Alaska to produce framework geologic maps that will expand the knowledge base of Alaska's geologic and mineral resources, catalyze future private-sector mineral exploration and development, and guide government agencies' planning projects. The AGGMI project is 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 Chulitna project was also provided by the U.S. Geological Survey under U.S. Department of the Interior, U.S. Geological Survey, National Cooperative Geological Survey STATEMAP Cooperative Agreement 98HQAG2083. 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. Additional Acknowledgments: C.C. Hawley shared his expertise on the geology, mineral deposits, and mining history of the Chulitna district. Geochronology performed by Paul Layer, Deitre Hansen, Kaitlin Hansen, and Jeff Drake with the University of Alaska Fairbanks Geochronology Lab; paleontologic work was performed under the direction of Robert Blodgett by M.Z. Won and Paula Noble (radiolarians), Chris McRoberts, Michael Sandy, and George Stanley (Mesozoic megafossils), and Norman Savage (conodonts); Michael Whalen assisted with the measurement and interpretation of a Permian limestone section; David Stone, with students Howard Scher and Chad Schopp, conducted paleomagnetic studies; Paul Chu and Adam Low, UAF student interns, provided office compilations and Sara Haug provided field assistance; Mike Messing provided personal geologic mapping and photos of portions of the area.

  3. To whom should users address questions about the data?

    State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
    GIS Data Manager/Cartographer
    3354 College Road
    Fairbanks, AK 99709-3707

    (907) 451-5029 (voice)
    (907) 451-5050 (FAX)
    dggspubs@alaska.gov

    Contact_Instructions:
    You may view our web site at <http://www.dggs.dnr.state.ak.us> for the latest information on available data. Please e-mail your questions and data requests when possible since our web site and e-mail address will remain current even if our phone number and mailing address change.


Why was the data set created?

The purpose of this project was to produce a 1:63,360-scale geologic map for the airborne geophysical surveys released by DGGS in the Chulitna region during 1996. The geologic data are important for identifying potential mineral deposits and for characterizing and distinguishing between geologic units.


How was the data set created?

  1. From what previous works were the data drawn?

    Hawley and Clark, 1974 (source 1 of 3)
    Hawley, C.C., and Clark, A.L., 1974, Geology and mineral deposits of the upper Chulitna district, Alaska: U.S. Geological Survey Professional Paper PP 758-B, United States Government Printing Office, Washington D.C., Maryland.

    Other_Citation_Details: p. B1-B47, 2 sheets, scale 1:12,000
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 12000
    Source_Contribution:
    These data were used to further define the geology of the Chulitna area. See this publication cited in the Process Step section below.

    Jones and others, 1980 (source 2 of 3)
    Jones, D.L., Silberling, N.J., Csejtey, B., Jr., Nelson, W.H., and Blome, C.D., 1980, Age and structural significance of ophiolite and adjoining rocks in the upper Chulitna district, south-central Alaska: U.S. Geological Survey Professional Paper PP 1121-A, United States Government Printing Office, Washington D.C..

    Other_Citation_Details: p. A1-A21, 2 plates in text, 1 sheet, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Contribution:
    These data were used to further define the geology of the Chulitna area. See this publication cited in the Process Step section below

    Csejtey and others, 1992 (source 3 of 3)
    Csejtey, B., Jr., Mullen, M.W., Cox, D.P., and Striker, G.D., 1992, Geology and geochronology of the Healy Quadrangle, south-central Alaska: U.S. Geological Survey Map I-1961 I-1961, United States Government Printing Office, Washington, D.C..

    Other_Citation_Details: 63 p., scale 1:25,000, 2 sheets
    Type_of_Source_Media: paper
    Source_Contribution:
    These data were used to further define the geology of the Chulitna area. See this publication cited in the Process Step section below

  2. How were the data generated, processed, and modified?

    Date: 1998 (process 1 of 5)
    Fieldwork - Fieldwork for bedrock investigations, including ridge and valley traverses, road cut investigations, and river exposures, was conducted for six weeks between June 1997 and July 1998 by a crew of from six to seven geologists. Field notes and rock samples were collected throughout the footprint of the geophysical survey for bedrock investigations. Approximately seven person-days were spent on field investigations for the surficial geology; most surficial geology was created from air photos. Bedrock mapping involved using the geophysical maps on a daily basis for checking geologic contacts and units. Mappers recorded observations in field notebooks and on topographic maps, predominantly at 1:63,360 scale. In some areas, photocopies of topography at varying enlarged scales were used. All compilations were made by hand on stable mylar at 1:63,360 scale. Stations were located using topographic maps, compasses, and altimeters. In some instances, GPS devices with location precision varying up to 100 meters were used. Stations were also plotted by hand on stable mylar topographic bases and coordinates determined with a digitizing tablet. Field notes were entered into an Excel spreadsheet in the field office.

    Data sources used in this process:

    • Burns and others, 1997

    Date: 1998 (process 2 of 5)
    Laboratory data compilation - Laboratory analyses were performed on rock samples collected during the fieldwork from June 1997 intermittently through December 1998. Published geochemical and age results are found in Clautice and others (2001) and Gage and others (1998). Unpublished laboratory results include petrographic work on thin sections and modal analysis of rock slabs stained for plagioclase and potassium feldspar. Results from major-oxide and trace-element geochemistry of igneous and metamorphic rocks were used to calculate CIPW Norms for use in classifying rocks according to established petrologic nomenclature. Thin sections produced by this study are currently stored at the DGGS office in Fairbanks, Alaska. Rock samples, including geochemical sample pulps and rock hand samples from most field stations, are currently stored at the DGGS warehouse in Fairbanks. Final storage for most rock samples generated by this study will be at the DGGS Geologic Materials Center (GMC) in Eagle River, Alaska.

    Data sources used in this process:

    • Clautice and others, 2001
    • Gage and others, 1998

    Date: 2000 (process 3 of 5)
    Laboratory data compilation - Laboratory analyses were performed on paleontological samples from July 1997 intermittently through July 1999. Paleontologic data were compiled in Blodgett and Clautice (2000). Paleontologic samples are currently stored at the DGGS Geologic Materials Center (GMC) in Eagle River, Alaska.

    Data sources used in this process:

    • Blodgett and Clautice, 2000

    Date: 2000 (process 4 of 5)
    Geologic map compilation - The bedrock geologic map was compiled using field notes from fieldwork process step (above), analytical results from laboratory data compilation process step (above), and all known geologic data from previous work in the quadrangle. The main sources of existing data include Hawley and Clark (1974), Jones and others (1980), Csejtey and others (1992), Gage and others (1998), Clautice and others (1998) and Burns and others (1997). Data were compiled on multiple layers of stable mylar at 1:63,360 scale. Relevant information from all mylar layers was compiled onto one stable mylar sheet with abundant control points.

    Data sources used in this process:

    • Burns and others, 1997
    • Clautice and others, 1998
    • Csejtey and others, 1992
    • Gage and others, 1998
    • Hawley and Clark, 1974
    • Jones and others, 1980

    Date: 2001 (process 5 of 5)
    Digital cartography - The geologic map compilation mylar (above) was hand digitized in ArcEdit 7.0.4 with an RMS error of 0.002. Bedrock polygons were coded. Excel files of previously digitized point data, including age date samples, some major oxide analyses, dikes too small to plot at 1:63,360 scale, and structural measurements, were translated into Arc/Info format and plotted.

  3. What similar or related data should the user be aware of?

    Gage, B.G., Liss, S.A., and Clautice, K.H., 199810, Preliminary geochemical and major oxide data: Chulitna project, Healy A-6 Quadrangle and nearby areas (1997 and 1998): Public Data File PDF 98-36, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.

    Online Links:

    Other_Citation_Details: 48 p., 2 sheets, scale 1:63,360, 1 disk
    Blodgett, R.B., and Clautice, K.H., 2000, Fossil locality map for the Healy A-6 Quadrangle, southcentral Alaska: Report of Investigation RI 2000-5, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.

    Online Links:

    Other_Citation_Details: 42 p., 1 sheet, scale 1:63,360
    Clautice, K.H., Newberry, R.J., Blodgett, R.B., Bundtzen, T.K., Gage, B.G., Harris, E.E., Liss, S.A., Miller, M.L., Reifenstuhl, R.R., Clough, J.G., and Pinney, D.S., 2001, Bedrock geologic map of the Chulitna region, southcentral Alaska: Report of Investigation RI 2001-1A, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, Alaska - USA.

    Online Links:

    Other_Citation_Details: 31 p., 1 sheet, scale 1:63,360
    Pinney, D.S., 200105, Surficial-geologic map of the Chulitna region, southcentral Alaska: Report of Investigation RI 2001-1C, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.

    Online Links:

    Other_Citation_Details: 3 p., 1 sheet, scale 1:63,360
    Pinney, D.S., 2001, Engineering-geologic map of the Chulitna region, southcentral Alaska: Report of Investigation RI 2001-1D, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.

    Online Links:

    Other_Citation_Details: 5 p., 1 sheet, scale 1:63,360
    Burns, L.E., Dighem, and WGM Mining and Geological Consultants, 1997, CD-ROM digital archive files of 1996 survey data for Chulitna and Petersville mining districts, Alaska: Public Data File PDF 97-5, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 1 CD-ROM
    Pritchard, R.A., and Dighem, 1997, Project report of the airborne geophysical survey for the Chulitna and Petersville mining districts, Alaska: Public Data File PDF 97-8, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 293 p., 2 sheets, scale 1:63,360
    Burns, L.E., 1997, Portfolio of aeromagnetic and resistivity maps of the Chulitna mining district: Public Data File PDF 97-7, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 13 p., 1 sheet


How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    Geologic point, line, and polygon data were determined in the field using 1:63,360-scale topographic maps and altimeters. Data were digitized from mylar compilations. Bedrock geologic information was compiled on stable mylar with abundant control points at 1:63,360 scale and registered in ArcEdit, then layered onto a 1:63,360-scale USGS topographic base. Geologic data included in the compilation are the field maps and notes from this project as well as data from other sources as noted in the "Sources Cited" section.

  2. How accurate are the geographic locations?

    Location data were determined visually using topographic maps at scales of 1:63,360 and larger. Altimeters were also used. Occasional use was made of hand-held GPS, but Selective Availability, a random 100-meter error assigned to GPS signals by the U.S. government, was in place at the time. Geologic contacts, sample, and station locations were visually hand-plotted onto stable mylar bases from the field maps. The coordinates of sample and station locations were entered into an Excel spreadsheet with a digitizing tablet. Station notes and sample descriptions were entered into an Excel spreadsheet. The lists of samples were visually checked against the lists of analyzed samples returned from the laboratories. It was verified that all the samples plotted on the maps are included in the various tables and spreadsheets.

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    This dataset includes geospatial information about geologic units, age and field sample locations, structural features, structural measurements, and dike locations.

  5. How consistent are the relationships among the observations, including topology?

    Polygon topology present and clean on appropriate data; others are line or point data.


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:
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).
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. 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.

  1. Who distributes the data set? (Distributor 1 of 1)

    State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
    Natural Resource Technician
    3354 College Road
    Fairbanks, AK 99709-3707
    USA

    907-451-5020 (voice)
    907-451-5050 (FAX)
    dggspubs@alaska.gov

    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
    Contact_Instructions:
    Please view our web site (<http://www.dggs.dnr.state.ak.us>) for the latest information on available data. Please contact us using the e-mail address provided above when possible.
  2. What's the catalog number I need to order this data set?

    Report of Investigation 2001-1B

  3. What legal disclaimers am I supposed to read?

    The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services 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, any failure thereof, or otherwise, and in no event will the State of Alaska's liability to the requester or anyone else exceed the fee paid for the electronic service or product.

  4. How can I download or order the data?

  5. What hardware or software do I need in order to use the data set?

    Please check the MapInfo web site (<http://www.mapinfo.com/>) for the latest documentation on importing ESRI shape files.


Who wrote the metadata?

Dates:
Last modified: 06-May-2008
Last Reviewed: 06-May-2008
To be reviewed: 15-Mar-2009
Metadata author:
State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
Metadata Manager
3354 College Road
Fairbanks, AK 99709-3707
USA

907-451-5039 (voice)
907-451-5050 (FAX)
dggspubs@alaska.gov

Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays.
Contact_Instructions:
Please contact us through the e-mail address above whenever possible.
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)


Generated by mp version 2.9.6 on Tue May 06 14:29:39 2008