40Ar/39Ar ages from the Tyonek D-6 quadrangle and parts of Tyonek D-7, Tyonek D-5 and Tyonek C-6 quadrangles, Alaska

Metadata also available as - [Parseable text] - [XML]

Frequently-anticipated questions:


What does this data set describe?

Title:
40Ar/39Ar ages from the Tyonek D-6 quadrangle and parts of Tyonek D-7, Tyonek D-5 and Tyonek C-6 quadrangles, Alaska
Abstract:
40Ar/39Ar data from plutonic and volcanic samples collected during preliminary mapping of the Tyonek D-6 and parts of Tyonek D-5, D-7 and C-6 quadrangles yield results indicating three discrete igneous events at about 55, 60 and 68 Ma. Igneous clasts from a boulder conglomerate retain Early Cretaceous ages.
Supplemental_Information:
Attribute information for the following tables (entities) is included in this metadata file under the "Entity_and_Attribution_Information" section. The tables are as follows:
Table1_coordinates     Coordinates for 40Ar/39Ar samples
Table2_agesummary     Summary table for 40Ar/39Ar data
Table3_analyticaldata     The 40Ar/39Ar analytical data associated with each recorded temperature
  1. How should this data set be cited?

    Layer, P.W., and Solie, D.N., 2008, 40Ar/39Ar ages from the Tyonek D-6 quadrangle and parts of Tyonek D-7, Tyonek D-5 and Tyonek C-6 quadrangles, Alaska: Raw Data File RDF 2008-4, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, Alaska - USA.

    Online Links:

    Other_Citation_Details: 14 pp.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -152.3361
    East_Bounding_Coordinate: -151.8734
    North_Bounding_Coordinate: 61.9254
    South_Bounding_Coordinate: 61.6924

  3. What does it look like?

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

    Beginning_Date: 1990
    Ending_Date: 1991
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: tabular 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: 5
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -153.000
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000
      False_Northing: 0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 1
      Ordinates (y-coordinates) are specified to the nearest 1
      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?

    Table1_coordinates.csv
    Coordinates for 40Ar/39Ar samples (Source: Alaska Division of Geological & Geophysical Surveys)

    SampleNo
    Items in the Sample Number field (Source: Alaska Division of Geological & Geophysical Surveys)

    Sample numbers are unique identifiers derived from the last two digits of the year the sample was collected, initials of the geologist's name who collected it, and the consecutively numbered station location. If more than one sample was collected from the station location, each is assigned a letter (a, b, c, etc) designator as well.

    Easting
    UTM easting coordinate, Zone 5, NAD 27 (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:534911
    Maximum:559281
    Units:m

    Northing
    UTM northing coordinate, Zone 5, NAD 27 (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:6840075
    Maximum:6866077
    Units:m

    Latitude
    Latitude coordinate, NAD 27 (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:61.6924
    Maximum:61.9254
    Units:decimal degree

    Longitude
    Longitude coordinate, NAD27 (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:151.8734
    Maximum:152.3361
    Units:decimal degree

    Table2_agesummary.csv
    Summary table for 40Ar/39Ar data (Source: Alaska Division of Geological & Geophysical Surveys)

    SampleNo
    Items in the Sample Number field (Source: Alaska Division of Geological & Geophysical Surveys)

    Sample numbers are unique identifiers derived from the last two digits of the year the sample was collected, initials of the geologist's name who collected it, and the consecutively numbered station location. If more than one sample was collected from the station location, each is assigned a letter (a, b, c, etc) designator as well.

    Mineral
    Material used for age date (Source: Alaska Division of Geological & Geophysical Surveys)

    Material used for dating. Includes BI (biotite), HO (hornblende), WR (whole rock).

    Integrated Age (Ma)
    Integrated age in million years, (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:54.1 +/-0.5
    Maximum:99.5 +/-0.7
    Units:Ma

    Plateau or Weighted Mean Age
    Summarizes the Plateau (P) Age or the Weighted Mean (W) Age in Million years for each sample (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:53.7 +/-0.4
    Maximum:101.0 +/-2.0
    Units:Ma

    Plateau Information
    Summarizes number of fractions, percent 39Ar released and MSWD for each sample (Source: Alaska Division of Geological & Geophysical Surveys)

    # of fractions, % 39Ar released, MSWD for each sample

    Table3_analyticaldata.csv
    For each sample, the 40Ar/39Ar analytical data associated with each recorded temperature (Source: Alaska Division of Geological & Geophysical Surveys)

    SampleNo
    Items in the Sample Number field (Source: Alaska Division of Geological & Geophysical Surveys)

    Sample numbers are unique identifiers derived from the last two digits of the year the sample was collected, initials of the geologist's name who collected it, and the consecutively numbered station location. If more than one sample was collected from the station location, each is assigned a letter (a, b, c, etc) designator as well.

    Temp
    Temperature in Degrees C of step for which data were recorded (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:300
    Maximum:1700
    Units:Degrees C

    Cum. 39Ar
    Cumulative 39Argon (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:0.0000
    Maximum:1.0000

    40Ar/39Ar measured
    Measured 40Ar/39Ar ratio at each heating step, corrected for blank and 39Ar decay (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:2.5705
    Maximum:1134.98

    +/-
    Defines the size of the error bars for each measurement to one standard deviation (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:0.0001
    Maximum:200.0000

    37Ar/39Ar measured
    The ratio of 37Ar to 39Ar measured at each temperature interval for each sample corrected for blank and 37Ar and 39Ar decay (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:0.0001
    Maximum:400.0000

    36Ar/39Ar
    Ratio of amounts of 36Ar to 39Ar measured at each temperature interval for each sample corrected for blank and 39Ar decay (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:0.0000
    Maximum:0.4000

    % Atm. 40Ar
    Percent of 40Ar which is atmospheric in composition (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:0.0
    Maximum:220.0

    Ca/K
    ratio of Calcium to Potassium as determined from 37Ar/39Ar (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:0.0000
    Maximum:1000.0000

    Cl/K
    ratio of Chlorine to Potassium as determined from 38Ar/39Ar (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:0.00000
    Maximum:0.80000

    40Ar*/39ArK
    ratio of radiogenic 40Ar to 39Ar derived from potassium (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:-111.0000
    Maximum:140.0000

    Age (Ma)
    calculated age for each temperature step for each sample (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:0.0
    Maximum:150.0
    Units:Ma


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?

    This research was supported by State funding to the Alaska Division of Geological & Geophysical Surveys. Additional Acknowledgments: 1990 DGGS field mapping and sample collection by DN. Solie, J.T. Kline (deceased), W.G. Gilbert, E.E. Harris, M.S. Robinson, S.A. Liss and K.K. DePalma. Review of draft manuscript by D.J. Szumigala.

  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?

In 1990, DGGS conducted a preliminary geologic mapping project in the Tyonek D-6 and parts of the adjacent D-5, D-7 and C-6 quadrangles. DGGS published a preliminary geologic map and geochemical data resulting from that initial work in 1991 (Solie and others, 1991a and 1991b). At that time, the results from the 40Ar/39Ar age dating were pending. A brief discussion of the results was given in Layer and Solie (1991) and Solie and Layer (1993). The purpose of this DGGS Raw Data File is to present the 40Ar/39Ar results and make them available for use to others interested in the area.


How was the data set created?

  1. From what previous works were the data drawn?

    Lanphere and others, 1990 (source 1 of 8)
    Lanphere, M.A., Dalrymple, G.B., Fleck, R.J., and Pringle, M.S., 1990, Intercalibration of mineral standards for K/Ar and 40Ar/39Ar age measurements: EOS Transactions of the American Geophysical Union v. 71.

    Other_Citation_Details: (abstract), P. 1658
    Type_of_Source_Media: paper
    Source_Contribution: Describes intercalibration standards

    Layer and Solie, 1991 (source 2 of 8)
    Layer, P.W., and Solie, D.N., 1991, Timing of igneous activity and basin formation, southern Alaska Range, as constrained by 40Ar/39Ar dating: EOS Transactions of the American Geophysical Union v.72, no. 44.

    Other_Citation_Details: (abstract), p. 503
    Type_of_Source_Media: paper
    Source_Contribution: Abstract discussing age results

    McDougall and others, 1999 (source 3 of 8)
    McDougall, I, and Harrison, T.M., 1999, Geochronology and Thermochronology by the 40Ar/39Ar method: Oxford University Press, Oxford.

    Other_Citation_Details: 269 pp.
    Type_of_Source_Media: paper
    Source_Contribution:
    Source reference for equations and corrections used in age calculation.

    Samson and Alexander, 1987 (source 4 of 8)
    Samson, S.D., and Alexander, E.C., 1987, Calibration of the interlaboratory 40Ar/39Ar dating standard, MMhb-1: Chemical Geology v. 66.

    Other_Citation_Details: p. 27-34
    Type_of_Source_Media: paper
    Source_Contribution: Interlaboratory calibration data for age determination

    Solie and others, 1991b (source 5 of 8)
    Solie, D.N., Kline, J.T., Gilbert, W.G., Robinson, M.S., Harris, E.E., and Liss, S.A., 1991, Analytical results from rock and pan concentrate samples, Tyonek D-6 and parts of adjacent quadrangles, Alaska: Public Data File PDF 91-1.

    Online Links:

    Other_Citation_Details: 14 pp., 1 sheet, scale 1:63,360
    Type_of_Source_Media: online
    Source_Contribution:
    Geochemical data from samples collected from project area; sample location map

    Solie and others, 1991a (source 6 of 8)
    Solie, D.N., Gilbert, W.G., Harris, E.E., J.T., Kline., Liss, S.A., and Robinson, M.S., 1991, Preliminary geologic map of Tyonek d-6 and eastern Tyonek D-7 quadrangles, Alaska: Public Data File PDF 91-10.

    Online Links:

    Other_Citation_Details: 16 pp., 1 sheet, scale 1:40,000
    Type_of_Source_Media: online
    Source_Contribution: Preliminary map of project area

    Solie and Layer, 1993 (source 7 of 8)
    Solie, D.N., and Layer, P.W., 1993, The Hayes Glacier Fault, southern Alaska Range: Evidence for post-paleocene movement: Professional Report PR 106, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: p. 71-80
    This is part of the following larger work.

    Solie, D.N., and Tannian, Fran, 1993, Short Notes on Alaskan Geology 1993: Professional Report PR 113, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 99 pp.
    Type_of_Source_Media: paper
    Source_Contribution: includes discussion of age results

    Steiger and Jager, 1977 (source 8 of 8)
    Steiger, R.H., and Jager, E, 1977, Subcommission on geochronology: convention on the use of decay constants in geo- and cosmochronology: Earth and Planetary Science Letters v.36.

    Other_Citation_Details: p. 359-363
    Type_of_Source_Media: paper
    Source_Contribution: discussion of use of decay constants in age determination

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

    Date: Jul-1990 (process 1 of 2)
    Fieldwork - The Tyonek D-6 and parts of the D-5, D-7 and C-6 quadrangles were mapped in 1990 as a preliminary project in anticipation of a continued 1:63,360 mapping project in the Tyonek quadrangle. Preliminary mapping was conducted from July 20 to August 4, 1990. Members of the field crew were DGGS staff members D.N. Solie, W.G. Gilbert, E.E. Harris, J.T. Kline, S.A. Liss, M.S. Robinson and Keri DePalma. Funding did not allow the continuation of the project, and the results of the 1990 mapping were released as a preliminary geologic map (Solie and others, 1991a). Geochemical data from samples collected during the mapping project were published in 1991 (Solie and others, 1991b). At that time, the results from the 40Ar/39Ar dating were pending. A brief discussion of the results was given in Layer and Solie (1991) and Solie and Layer (1993). Preliminary mapping was conducted in 1993 in the course of 1 1/2 weeks in which mile to inch mapping of the outcrop belt of the Tingmerkpuk Sandstone was begun. In addition, measurement of a well exposed section on Tingmerkpuk Mountain, study of depositional environment of sandstones, and sampling for micropaleontology, organic geochemistry, and apatite fission track analysis was carried out. Additional mapping of the Tingmerkpuk outcrop belt and stratigraphic studies throughout the area were continued in a brief one-week field program in 1994, and in a one-month program in 1996. In these programs, reconnaissance sampling for organic geochemistry and micropaleontology, detailed stratigraphic studies of a distinctive limestone coquina and two stratigraphic sections of Upper Triassic to Hauterivian rocks, and samples for apatite fission-track cooling and uplift history were collected. Continued geologic mapping and study of Neocomian depositional environment as well as additional sampling was conducted in the final month long field season in 1998. Surficial deposits were interpreted from 1:63,360 scale aerial photographs, incorporating limited field observations made during traverses while mapping bedrock units, and by aerial reconnaissance. Published data (Chapman and Sable, 1960) served as a guide for interpretation. No glacial deposits are recognized in the Kukpowruk River area, as Quaternary glaciation apparently did not occur on the north side of the western DeLong Mountains. Bedrock mapping involved using aerial photographs and topographic maps on a daily basis for checking geologic contacts and units. Mappers recorded observations in field notebooks and on the aerial photographs and 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 aerial photographs, 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.

    Data sources used in this process:

    • Solie and others, 1991a
    • Solie and others, 1991b
    • Layer and Solie, 1991
    • Solie and Layer, 1993

    Date: 1991 (process 2 of 2)
    Labwork - Separates for 40Ar/39Ar dating were prepared to >99.5 percent purity (visual inspection) using standard heavy liquid and magnetic separation techniques followed by hand-picking under a binocular microscope. Thin section examination of the samples prior to crushing indicated that the chosen minerals were free from alteration and sufficiently coarse-grained for mechanical separation. For all minerals, grains in the size range of 250 - 500 microns were used. For each sample, ~50-80 mg of biotite or 250-350 mg of hornblende or whole rock (phenocryst-free groundmass) was packaged in an aluminum foil tube and irradiated in position 5C at the McMaster University nuclear reactor, in Hamilton, Ontario. Approximately 20 samples were irradiated at a time. Six packages containing ~20 mg of the standard mineral mmhb-1 (Samson and Alexander, 1987) with an age of 513.9 Ma (Lanphere and others, 1990) were also irradiated with the samples to determine the irradiation parameter (J) and the flux gradient in the reactor. Samples and standards were analyzed 45 to 90 days after irradiation. The irradiated samples were step-heated on-line in a Modifications Ltd. low-blank furnace. Temperature control was better than 5 degrees and a maximum temperature in excess of 1600o C was achievable to ensure complete sample fusion. The extracted argon was purified in a two-stage process using a liquid nitrogen cold finger and two SAES Zr-Al getters. Prior to measurement of the Ar, the gas was collected on an activated charcoal finger. The purified Ar gas was measured using a Nuclide 6-60-SGA 15 cm mass spectrometer. The sensitivity of the spectrometer is 6.5 x 10-15 mol/mV and system noise is generally around 0.02 mV. System blanks are generally better than 1 X 10-14 mol for 40Ar. Argon isotopic measurements for both samples and standards were corrected for the system blanks, for decay of 37Ar and 39Ar, and for reactor-induced isotopic interferences. Ages were calculated using the equations and corrections from McDougall and Harrison (1999) and the constants from Steiger and Jaeger (1977). All errors on analyses are reported at the 1-sigma level. For each mass spectrometer analysis, five Ar isotope abundances are measured. 36Ar is used to determine the amount of atmospheric or initial Ar in the sample, 37Ar provides an estimation of the Ca content in the mineral, 38Ar provides an estimation of the Cl content, 39Ar reflects the K content and 40Ar is a mixture of initial and radiogenic Ar. The age of the sample is proportional to the ratio of the amount of radiogenic 40Ar to the amount of 39Ar produced by neutron bombardment from 40K.

    Data sources used in this process:

    • Samson and Alexander, 1987
    • Lanphere and others, 1990
    • McDougall and Harrison, 1999
    • Steiger and Jaeger, 1977

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


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

  1. How well have the observations been checked?

    All field locations were visually determined by the geologists in the field and recorded on a 1:63,360 topographic map enlarged to a scale of 1:40,000. Coordinates were digitized visually from the field maps. DGGS submitted fourteen rock samples to the UAF Geochronology Laboratory for 40Ar/39Ar dating. Major oxide and selected trace element analyses for most of the samples are included in Solie and others (1991b). Separates for 40Ar/39Ar dating were prepared to >99.5% purity (visual inspection) using standard heavy liquid and magnetic separation techniques followed by hand-picking under a binocular microscope. Thin section examination of the samples prior to crushing indicated that the chosen minerals were free from alteration and sufficiently coarse-grained for mechanical separation. For all minerals, grains in the size range of 250 - 500 microns were used. For each sample, ~50-80 mg of biotite or 250-350 mg of hornblende or whole rock (phenocryst-free groundmass) was packaged in an aluminum foil tube and irradiated in position 5C at the McMaster University nuclear reactor, in Hamilton, Ontario. Approximately 20 samples were irradiated at a time. Six packages containing ~20 mg of the standard mineral mmhb-1 (Samson and Alexander, 1987) with an age of 513.9 Ma (Lanphere and others, 1990) were also irradiated with the samples to determine the irradiation parameter (J) and the flux gradient in the reactor. Samples and standards were analyzed 45 to 90 days after irradiation. The irradiated samples were step-heated on-line in a Modifications Ltd. low-blank furnace. Temperature control was better than 5 degrees and a maximum temperature in excess of 1600o C was achievable to ensure complete sample fusion. The extracted argon was purified in a two-stage process using a liquid nitrogen cold finger and two SAES Zr-Al getters. Prior to measurement of the Ar, the gas was collected on an activated charcoal finger. The purified Ar gas was measured using a Nuclide 6-60-SGA 15 cm mass spectrometer. The sensitivity of the spectrometer is 6.5 x 10-15 mol/mV and system noise is generally around 0.02 mV. System blanks are generally better than 1 X 10-14 mol for 40Ar. Argon isotopic measurements for both samples and standards were corrected for the system blanks, for decay of 37Ar and 39Ar, and for reactor-induced isotopic interferences. Ages were calculated using the equations and corrections from McDougall and Harrison (1999) and the constants from Steiger and Jaeger (1977) and are shown in Table 2 (age summary) and Table 3 (analytical data). All errors on analyses are reported at the 1-sigma level. For each mass spectrometer analysis, five Ar isotope abundances are measured. 36Ar is used to determine the amount of atmospheric or initial Ar in the sample, 37Ar provides an estimation of the Ca content in the mineral, 38Ar provides an estimation of the Cl content, 39Ar reflects the K content and 40Ar is a mixture of initial and radiogenic Ar. The age of the sample is proportional to the ratio of the amount of radiogenic 40Ar to the amount of 39Ar produced by neutron bombardment from 40K.

  2. How accurate are the geographic locations?

    Sample locations were determined visually by geologist in the field, using a Brunton compass and altimeter and topographic map. Locations were then digitized visually from the field maps using ArcGIS v9.2.

  3. How accurate are the heights or depths?

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

    This dataset includes all of the samples submitted for 40Ar/39Ar age date analyses from the Tyonek quadrangle which were collected by DGGS during the summer of 1990.

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

    No topologic relationships are present in the 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 and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
Use_Constraints:
Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. 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?

    Raw Data File 2008-4

  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?

    CSV (Comma Separated Value) files can be imported and formatted with Microsoft Excel, OpenOffice.org Calc, or most spreadsheet programs and can also be viewed with most text editing programs.


Who wrote the metadata?

Dates:
Last modified: 05-Jun-2008
Last Reviewed: 05-Jun-2008
To be reviewed: 04-Jun-2010
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 Thu Jun 05 17:07:10 2008