Geologic map of the Deer Island quadrangle, Columbia County, Oregon and Cowlitz County, Washington

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Frequently anticipated questions:

What does this data set describe?

Title:
Geologic map of the Deer Island quadrangle, Columbia County, Oregon and Cowlitz County, Washington
Abstract:
This digital map database, compiled from previously published and unpublished data, and new mapping by the authors, represents the general distribution of bedrock and surficial deposits of the Deer Island 7.5-minute quadrangle. The database delineates map units that are identified by general age and lithology following the stratigraphic nomenclature of the U.S. Geological Survey. The scale of the source maps limits the spatial resolution (scale) of the database to 1:24,000 or smaller.
  1. How might this data set be cited?
    Evarts, Russell C., 2002, Geologic map of the Deer Island quadrangle, Columbia County, Oregon and Cowlitz County, Washington: U.S. Geological Survey Miscellaneous Field Studies Map MF-2392.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -122.875280
    East_Bounding_Coordinate: -122.749437
    North_Bounding_Coordinate: 46.000206
    South_Bounding_Coordinate: 45.874795
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2002
    Currentness_Reference:
    Publication date
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: map
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • Complete chain
      • Label point
      • GT-polygon composed of chains
      • Point
      • Label point
    2. What coordinate system is used to represent geographic features?
      The map projection used is Transverse Mercator.
      Projection parameters:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -123
      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 0.000032
      Ordinates (y-coordinates) are specified to the nearest 0.000032
      Planar coordinates are specified in meters
      The horizontal datum used is D_Clarke_1866.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.400000.
      The flattening of the ellipsoid used is 1/294.978698.
  7. How does the data set describe geographic features?
    di_geo.aat
    LTYPE
    di_geo.pat
    PTYPE
    Geologic unit designation
    ValueDefinition
    QaAlluvium (Holocene)
    QlsLandslide deposits (Holocene and Pleistocene), Cataclysmic flood deposits (Pleistocene)
    QfgGravel facies
    QfsSilt and sand facies
    QshMount St. Helens-derived alluvium (Pleistocene)
    QooOutwash deposits (Pleistocene)
    QTcConglomerate (Pleistocene and Pliocene)
    TtfTroutdale Formation (Pliocene)
    TsrSandy River Mudstone (Pliocene? and Miocene)
    TidIntrusive dacite (Eocene)
    TwfsWanapum Basalt, Frenchman Springs Member, basalt of Sand Hollow, Grande Ronde Basalt of Columbia River Basalt Group (Miocene)
    TgsbMember of Sentinel Bluffs of Columbia River Basalt Group (Miocene)
    TgwwMember of Winter Water of Columbia River Basalt Group (Miocene)
    TgoMember of Ortley of Columbia River Basalt Group (Miocene)
    TgwrMember of Wapshilla Ridge of Columbia River Basalt Group (Miocene)
    TgruUnassigned, reversely-magnetized, high-MgO basalt of Columbia River Basalt Group (Miocene)
    TbcBasalt-cobble conglomerate (Miocene)
    TpbPittsburg Bluff Formation (Oligocene)
    TgvtTuff Goble volcanics (Eocene)
    TgvbBasaltic andesite of Goble volcanics (Eocene)
    TdbDacite breccia (Eocene)
    TvsVolcaniclastic sedimentary rocks (Eocene)
    TtTuff (Eocene)
    TbbBasaltic Andesite Breccia (Eocene)
    TbaBasaltic andesite (Eocene)
    TxaXenolithic Andesite (Eocene)
    di_stx.pat
    Structural point features and measurements
    PTTYPE
    Type of point feature or measurement
    ValueDefinition
    beddingoriginally-horizontal depositional surface
    fault, ss, llLeft-lateral strike-slip fault
    horz beddingHorizontal bedding
    igneous foliation 
    inclined cleavage 
    DIP
    inclination of the planar surface from horizontal, in the downward direction perpendicular to strike
    Range of values
    Minimum:0
    Maximum:84
    Units:degrees of arc
    Resolution:1
    STRIKE
    Azimuth of the line formed by the intersection of the planar surface with the horizontal
    Range of values
    Minimum:0
    Maximum:353
    Units:degrees of arc
    Resolution:1
    di_stx.aat
    Linear structural features
    LTYPE
    Type of linear structural feature
    ValueDefinition
    dikeIntrusive tabular igneous body making linear intersection with the map surface
    xsecLine of cross section
    chmpnt.dbf
    MAP_NO
    Range of values
    Minimum:1
    Maximum:39
    SAMPNO
    Unique sample identifier (text and numbers)
    LATITUDE
    Range of values
    Minimum:45.8770
    Maximum:45.9976
    Units:decimal degrees
    Resolution:0.0001
    LONGITUDE
    Range of values
    Minimum:-122.8708
    Maximum:-122.7501
    Units:decimal degrees
    Resolution:0.0001
    LATITUDE1
    Range of values
    Minimum:52.68
    Maximum:59.88
    Units:decimal degrees
    Resolution:0.01
    LONGITUDE1
    Range of values
    Minimum:45.00
    Maximum:52.26
    Units:decimal degrees
    Resolution:0.01
    MAP_UNIT
    ValueDefinition
    TidIntrusive dacite (Eocene)
    TwfsWanapum Basalt, Frenchman Springs Member, basalt of Sand Hollow, Grande Ronde Basalt of Columbia River Basalt Group (Miocene)
    TgsbMember of Sentinel Bluffs of Columbia River Basalt Group (Miocene)
    TgwwMember of Winter Water of Columbia River Basalt Group (Miocene)
    TgoMember of Ortley of Columbia River Basalt Group (Miocene)
    TgwrMember of Wapshilla Ridge of Columbia River Basalt Group (Miocene)
    TgruUnassigned, reversely-magnetized, high-MgO basalt of Columbia River Basalt Group (Miocene)
    TgvbBasaltic andesite of Goble volcanics (Eocene)
    TbbBasaltic Andesite Breccia (Eocene)
    TbaBasaltic andesite (Eocene)
    TxaXenolithic Andesite (Eocene)
    Tgro 
    ROCK_TYPE
    ValueDefinition
    Andesite 
    Basaltic Andesbasaltic andesite
    BasalticAndesbasaltic andesite
    Dacite 
    TgoMember of Ortley of Columbia River Basalt Group (Miocene)
    SIO2
    Range of values
    Minimum:51.03
    Maximum:63.29
    TIO2
    Range of values
    Minimum:0.87
    Maximum:2.99
    AL2O3
    Range of values
    Minimum:13.46
    Maximum:18.52
    FE2O3
    Range of values
    Minimum:0.0
    Maximum:10.52
    FEO
    ValueDefinition
    (empty) 
    Range of values
    Minimum:0.00
    Maximum:12.64
    MNO
    Range of values
    Minimum:0.10
    Maximum:0.25
    MGO
    Range of values
    Minimum:1.36
    Maximum:5.84
    CAO
    Range of values
    Minimum:3.89
    Maximum:10.41
    NA2O
    Range of values
    Minimum:2.78
    Maximum:4.45
    K2O
    Range of values
    Minimum:0.29
    Maximum:2.54
    P2O5
    Range of values
    Minimum:0.18
    Maximum:0.58
    LOI
    Range of values
    Minimum:0.00
    Maximum:2.99
    TOTAL
    Range of values
    Minimum:0.00
    Maximum:100.27
    R_SIO2
    Range of values
    Minimum:52.46
    Maximum:65.58
    R_TIO2
    Range of values
    Minimum:0.89
    Maximum:3.04
    R_AL2O3
    Range of values
    Minimum:13.69
    Maximum:18.93
    R_FEO
    Range of values
    Minimum:5.08
    Maximum:12.86
    R_MNO
    Range of values
    Minimum:0.11
    Maximum:0.25
    R_MGO
    Range of values
    Minimum:1.39
    Maximum:5.98
    R_CAO
    Range of values
    Minimum:4.01
    Maximum:10.70
    R_NA2O
    Range of values
    Minimum:2.83
    Maximum:4.57
    R_K2O
    Range of values
    Minimum:0.29
    Maximum:2.64
    R_P2O5
    Range of values
    Minimum:0.18
    Maximum:0.59
    PLAGIOCLAS
    Range of values
    Minimum:0.0
    Maximum:0.0
    CLINOPYROX
    ValueDefinition
    (empty) 
    Range of values
    Minimum:0.1
    Maximum:5.2
    ORTHOPYROX
    ValueDefinition
    (empty) 
    trace 
    Range of values
    Minimum:0.1
    Maximum:4.8
    OLIVINE
    Range of values
    Minimum:0.0
    Maximum:3.5
    FE_TI_OXID
    ValueDefinition
    (empty) 
    trace 
    Range of values
    Minimum:0.1
    Maximum:0.9
    GROUNDMASS
    Range of values
    Minimum:0.0
    Maximum:99.7
    NO_POINTS
    Range of values
    Minimum:0.0
    Maximum:826.0
    TEXTURE
    ValueDefinition
    aphyric/intergranula 
    aphyric/interser 
    aphyric/intersertal 
    microphyric/interser 
    porphyritic/hyalopil 
    porphyritic/intergra 
    seriate/intergranula 
    seriate/intersertal 
    seriate/pilotaxitic 
    seriate/subophitic 
    sparsely phyric 
    sparsely phyric/ 
    MG_
    Range of values
    Minimum:31.5
    Maximum:60.7
    BA
    Range of values
    Minimum:111
    Maximum:984
    Resolution:1
    RB
    ValueDefinition
    <10 
    Range of values
    Minimum:10
    Maximum:49
    Resolution:1
    SR
    Range of values
    Minimum:224
    Maximum:587
    Resolution:1
    Y
    Range of values
    Minimum:13
    Maximum:50
    Resolution:1
    ZR
    Range of values
    Minimum:86
    Maximum:422
    Resolution:1
    NB
    ValueDefinition
    <10 
    <10 (8) 
    Range of values
    Minimum:2.3
    Maximum:25
    Resolution:1
    NI
    Range of values
    Minimum:0
    Maximum:67
    Resolution:1
    CU
    Range of values
    Minimum:2
    Maximum:219
    Resolution:1
    ZN
    Range of values
    Minimum:68
    Maximum:147
    Resolution:1
    CR
    ValueDefinition
    (empty) 
    Range of values
    Minimum:21
    Maximum:64
    Resolution:1
    di_geochron.pat
    DATE
    Radiometric age estimate
    ValueDefinition
    36.1+/-0.336.1 Ma plus or minus 0.3 million years
    36.8+/-0.236.8 Ma plus or minus 0.2 million years
    37.3+/-0.337.3 Ma plus or minus 0.3 million years

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Russell C. Evarts
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?

Why was the data set created?

This database and accompanying plot files depict the distribution of geologic materials and structures at a regional (1:24,000) scale. The report is intended to provide geologic information for the regional study of materials properties, earthquake shaking, landslide potential, mineral hazards, seismic velocity, and earthquake faults. In addition, the report contains new information and interpretations about the regional geologic history and framework. However, the regional scale of this report does not provide sufficient detail for site development purposes.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  3. What similar or related data should the user be aware of?

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

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: None
Use_Constraints:
Uses of this digital geologic map should not violate the spatial resolution of the data. Although the digital form of the data removes the constraint imposed by the scale of a paper map, the detail and accuracy inherent in map scale are also present in the digital data. The fact that this database was edited for a scale of 1:24,000 means that higher resolution information is not present in the dataset. Plotting at scales larger than 1:24,000 will not yield greater real detail, although it may reveal fine-scale irregularities below the intended resolution of the database. Similarly, where this database is used in combination with other data of higher resolution, the resolution of the combined output will be limited by the lower resolution of these data.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey Information Services
    Box 25248, Denver Federal Center
    Denver, CO
    USA

    1-888-ASK-USGS (voice)
    1-303-202-4693 (FAX)
  2. What's the catalog number I need to order this data set? USGS MF-2392
  3. What legal disclaimers am I supposed to read?
    Reference to commercial entities is intended to be informative and is not an endorsement of those entities.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 05-Feb-2016
Metadata author:
Peter N Schweitzer
USGS Midwest Area
Collection manager, USGS Geoscience Data Clearinghouse, http://geo-nsdi.er.usgs.gov/
Mail Stop 954
12201 Sunrise Valley Dr
Reston, VA
USA

703-648-6533 (voice)
703-648-6252 (FAX)
pschweitzer@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://geo-nsdi.er.usgs.gov/metadata/map-mf/2392/metadata.faq.html>
Generated by mp version 2.9.48 on Tue Jul 03 20:05:15 2018