Geologic map of the Tillamook Highlands, northwest Oregon Coast Range: A digital database

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Frequently anticipated questions:


What does this data set describe?

Title:
Geologic map of the Tillamook Highlands, northwest Oregon Coast Range: A digital database
Abstract:
This digital geologic map database represents the distribution and character of Cenozoic geologic strata in six 15' quadrangles covering most of the Tillamook Highlands in the northwest Oregon Coast Range. The geologic map was published as Open-File Report 94-21, the Geologic Map of the Tillamook Highlands, Northwest Oregon Coast Range, by Wells and others.
  1. How might this data set be cited?
    Wells, Ray E., Parke D. Snavely, Jr, MacLeod, N.S., Kelly, Michael M., Parker, Michael J., Fenton, Johanna S., and Felger, Tracey J., 1995, Geologic map of the Tillamook Highlands, northwest Oregon Coast Range: A digital database: U.S. Geological Survey Open-File Report 95-670.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -124.0
    East_Bounding_Coordinate: -123.25
    North_Bounding_Coordinate: 45.75
    South_Bounding_Coordinate: 45.5
  3. What does it look like?
    http://pubs.usgs.gov/of/1995/of95-670/net2pdf.pdf (PDF)
    PDF representation of the north half of Tillamook geologic map.
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 1995
    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.
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 10
      Transverse_Mercator:
      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
      Planar coordinates are specified in meters
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview:
    ARC/INFO export files  Description of coverage
    
    neh_geo.e00            Faults, depositional contacts, and geologic unit identities
    neh_str.e00            Fold axes, oriented symbols (strike and dip information)
    neh_topo.e00           Base map
    neh_ann.e00            Labels for geologic units and faults
    enr_geo.e00            Faults, depositional contacts, and geologic unit identities
    enr_alt.e00            Alteration zones
    enr_str.e00            Oriented symbols (strike and dip information)
    enr_topo.e00           Base map
    enr_ann.e00            Labels for geologic units and faults
    tim_geo.e00            Faults, depositional contacts, and geologic unit identities
    tim_str.e00            Fold axes, oriented symbols (strike and dip information)
    tim_topo.e00           Base map
    tim_ann.e00            Labels for geologic units and faults
    til_geo.e00            Faults, depositional contacts, and geologic unit identities
    til_str.e00            Oriented symbols (strike and dip information)
    til_topo.e00           Base map
    til_ann.e00            Labels for geologic units and faults
    til_wel.e00            Well locations
    bla_geo.e00            Faults, depositional contacts, and geologic unit identities
    bla_str.e00            Fold axes, oriented symbols (strike and dip information)
    bla_topo.e00           Base map
    bla_ann.e00            Labels for geologic units and faults
    fai_geo.e00            Faults, depositional contacts, and geologic unit identities
    fai_str.e00            Fold axes, oriented symbols (strike and dip information)
    fai_topo.e00           Base map
    fai_ann.e00            Labels for geologic units and faults
    
    Entity_and_Attribute_Detail_Citation: http://pubs.usgs.gov/of/1995/of95-670/tildb.html
    XXX_ANN.AAT (XXX represents the first 3 letters of the quadrangle name)
    Annotation layer (Source: OFR-95-0670)
    LTYPE
    Line type (Source: OFR-95-0670)
    ValueDefinition
    contact, certainAnnotation
    dike, TibDike of map unit Tib
    XXX_GEO.PAT (XXX represents the first 3 letters of the quadrangle name)
    Geologic map units (Source: OFR-95-0670)
    PTYPE
    Polygon type (Source: OFR-95-0670)
    ValueDefinition
    QbBeach and dune deposits (Holocene)
    QfFluvial and estuarine deposits (Holocene)
    QlsLandslide deposits (Holocene and Pleistocene)
    QtOlder fluvial and estuarine deposits (Pleistocene)
    QTgBasalt boulder and gravel deposits (Pleistocene or Pliocene)
    TwfsWanapum Basalt - Frenchman Springs Member (middle Miocene)
    TcmSandstone at Cape Meares (middle Miocene)
    TgrGrande Ronde Basalt (middle Miocene)
    TacCannon Beach member of Niem and Niem (1985) - Astoria Formation (middle and lower Miocene)
    Tacssandstone unit - Astoria Formation (middle and lower Miocene)
    TanNetarts Bay member - Astoria Formation (middle and lower Miocene)
    Tammudstone unit - Astoria Formation (middle and lower Miocene)
    TaaAngora Peak member of Niem and Niem (1985) - Astoria Formation (middle and lower Miocene)
    TmsMudstone of Sutton Creek (lower Miocene)
    Tmsttuff beds of Sutton Creek (lower Miocene)
    TbcSandstone of Bewley Creek (lower Miocene and Oligocene?)
    Tbcmmudstone unit of Bewley Creek (lower Miocene and Oligocene?)
    TalAlesa Formation (lower Miocene and Oligocene)
    TalsFeldspathic sandstone - Alesa Formation (lower Miocene and Oligocene)
    TsgSandtone of Garibaldi (lower Miocene or Oligocene?)
    TpgPittsburgh Bluff Formation (upper Eocene)
    TkKeasey Formation (upper Eocene)
    TnNestucca Formation (upper Eocene)
    Tnbsbasaltic sandstone - Nestucca Formation (upper Eocene)
    TchbBasalt of Cascade Head (upper Eocene)
    TcCowlitz Formation (upper Eocene)
    TbsBasaltic sandstone at Roy Creek (upper and upper middle Eocene)
    TbpuUpper plagioclase-porphyritic basalt - Tillamook Volcanics (upper middle Eocene)
    TbuUpper porphyritic basalt flows - Tillamook Volcanics (upper middle Eocene)
    TbruUpper submarine basalt lapilli tuff and breccia - Tillamook Volcanics (upper middle Eocene)
    TbplLower plagioclase-porphyritic basalt - Tillamook Volcanics (upper middle Eocene)
    TbaAphyric basalt - Tillamook Volcanics (upper middle Eocene)
    TsfSubaerial dacite, rhyodacite, and rhyolite - Tillamook Volcanics (upper middle Eocene)
    TtsEpiclastic silicic tuff and tuff breccia - Tillamook Volcanics (upper middle Eocene)
    TblLower porphyritic basalt flows - Tillamook Volcanics (upper middle Eocene)
    TpbSubmarine basalt - Tillamook Volcanics (upper middle Eocene)
    TbrSubmarine basalt tuff and breccia - Tillamook Volcanics (upper middle Eocene)
    TyYamhill Formation (upper middle Eocene)
    Tybsbasaltic mudstone - Yamhill Formation (upper middle Eocene)
    TysSandstone - Yamhill Formation (upper middle Eocene)
    TytLower tuff unit - Yamhill Formation (upper middle Eocene)
    TetTyee Formation (lower middle Eocene)
    ThpbBasalt of Hembre Ridge (lower middle and lower Eocene)
    Thsbasaltic sandstone of Hembre Ridge (lower middle and lower Eocene)
    TsbrBasalt lapilli breccia unit - Siletz River Volcanics (lower Eocene)
    TsbSubaerial basalt flows - Siletz River Volcanics (lower Eocene)
    TspbPillow basalt - Siletz River Volcanics (lower Eocene)
    TifsWanapum Basalt Frenchman Springs Member (middle Miocene)
    TigrGrande Ronde Basalt (middle Miocene)
    TeibBasalt sills (late Eocene)
    TiabPorphyritic basalt (late middle Eocene)
    TisSilicic dikes (late middle Eocene)
    TibBasalt dikes and sills (late middle Eocene)
    TidBiotite pyroxene diorite (late middle Eocene)
    TidbDiabase (middle Eocene)
    XXX_GEO.AAT (XXX represents the first 3 letters of the quadrangle name)
    Linear geologic features (Source: OFR-95-0670)
    LTYPE
    Line type (Source: OFR-95-0670)
    ValueDefinition
    contact, approx. locatedContact whose position is not precisely known
    contact, certainObserved contact
    contact, concealedConcealed contact whose position is inferred
    contact, concealed, queriedConcealed contact whose position is questionable
    contact, inferred, queriedContact whose position is inferred and questionable
    dike, TibDike of map unit Tib
    dike, TisDike of map unit Tis
    fault, approx. locatedFault whose position is not precisely known
    fault, certainObserved fault
    fault, inferred, queriedFault whose position is inferred and queried
    fault, concealedFault whose position is concealed and inferred
    fault, concealed, queriedConcealed fault whose position is questionable
    thrust fault, approx. locatedThrust fault whose position is not precisely known
    thrust fault, certainObserved thrust fault
    thrust fault, concealedConcealed thrust fault whose position is inferred
    thrust fault, inferred, queried_Thrust fault whose position is inferred and questionable
    water boundary, certainBoundary of a body of water
    map boundary, certainBoundary of mapped area
    scratch boundaryLocation of scratch boundary
    XXX_GEO.PAT (XXX represents the first 3 letters of the quadrangle name)
    Geologic map units at specific locations (same attributes as polygon coverage of the same name) (Source: OFR-95-0670)
    XXX_STR.AAT (XXX represents the first 3 letters of the quadrangle name)
    Fold axes (Source: OFR-95-0670)
    LTYPE
    Line type (Source: OFR-95-0670)
    ValueDefinition
    f.a., anticline, certainObserved anticlinal fold axis
    f.a., anticline, concealedConcealed anticlinal fold axis whose position is inferred
    f.a., anticline, inferred, queriedAnticlinal fold axis whose position is inferred and questionable
    f.a., syncline, approx. locatedSynclinal fold axis whose position is not precisely known
    f.a., syncline, certainObserved synclinal fold axis
    f.a., syncline, concealedConcealed synclinal fold axis
    f.a., syncline, inferredInferred synclinal fold axis
    oil shaleoil shale location
    XXX_STR.PAT (XXX represents the first 3 letters of the quadrangle name)
    oriented symbols (strike and dip information) (Source: OFR-95-0670)
    PTTYPE
    Point type (Source: OFR-95-0670)
    ValueDefinition
    approx beddingBedding orientation that is not precise
    beddingBedding orientation
    flat beddingBedding whoe dip is zero
    foliationFoliation orientation
    inclined cleavageInclined cleavage orientation
    ot beddingOverturned bedding orientation
    vert beddingBedding whose dip is 90 degrees
    DIP
    Dip or plunge of bedding or foliation (Source: OFR-95-0670)
    Range of values
    Minimum:0
    Maximum:359
    Units:degrees
    Resolution:1
    STRIKE
    Azimuth of bedding or foliation (Source: OFR-95-0670)
    Range of values
    Minimum:0
    Maximum:359
    Units:degrees
    Resolution:1
    ENR_ALT.PAT
    Alteration zones in the Enright 15' quadrangle (Source: OFR-95-670)
    PTYPE
    Polygon type (Source: OFR-95-0670)
    ValueDefinition
    alteration zoneLocation of an alteration zone
    ENR_ALT.AAT
    Alteration zones (Source: OFR-95-0670)
    LTYPE
    Line type (Source: OFR-95-0670)
    ValueDefinition
    alteration boundaryBoundary of an alteration zone
    oil shaleOil shale location
    ENR_ALT.PAT
    Alteration zones in the Enright 15' quadrangle at specific locations (same attributes as polygon coverage ENR_ALT.PAT) (Source: OFR-95-0670)
    TIL_WEL.PAT
    well locations (Source: OFR-95-0670)
    PTTYPE
    Point type (Source: OFR-95-0670)
    ValueDefinition
    ONG CZ#1well identifier
    REC CZ#1Well identifier

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Ray E. Wells
    • Parke D. Snavely, Jr
    • N.S. MacLeod
    • Michael M. Kelly
    • Michael J. Parker
    • Johanna S. Fenton
    • Tracey J. Felger
  2. Who also contributed to the data set?
    Paleontologic age assignments of molluscan fauna have been given by Ellen James Moore, foraminifera by Weldon W. Rau, and coccoliths by David Bukry. Mike Gallagher and Cheryl Hummon provided able assistance in the field. We appreciate the comments of Angela Jayko on an earlier version of the map. Tracey Felger and Johanna Fenton compiled and edited the entire map in ARCINFO. We thank Allison Asbjornsen, Leo and Shannon Brosseau, Jim and Mary Winter and the residents of Tillamook, Netarts, and Oceanside for sharing their local knowledge and hospitality.
  3. To whom should users address questions about the data?
    Wells, Ray E
    USGS-GEO-WRG-NGM
    Mail Stop 975, USGS
    345 Middlefield Road
    Menlo Park, CA
    US

    650-329-4933 (voice)
    rwells@usgs.gov

Why was the data set created?

Together with the accompanying text file (tilgeo.ps or tilgeo.txt), it provides the most recent synthesis of the stratigraphy and structural geology of the northern Coast Range uplift.

How was the data set created?

  1. From what previous works were the data drawn?
    Wells and others (1994) (source 1 of 1)
    Wells, Ray E., Parke D. Snavely, Jr, MacLeod, N.S., Kelly, Michael M., and Parker, Michael J., 1994, Geologic Map of the Tillamook Highlands, Northwest Oregon Coast Range: U.S. Geological Survey Open-File Report 94-21.

    Type_of_Source_Media: paper
    Source_Scale_Denominator: 62500
    Source_Contribution: Source map for digital compilation.
  2. How were the data generated, processed, and modified?
    Date: 1994 (process 1 of 2)
    The geologic map information from twenty four 1:24,000 scale field maps was reduced and compiled at 1:48,000 scale on six stable originals created from the 7.5' bases. The geology was digitized from the six 1:48,000 map sheets, each of which represent a quadrangle (Tillamook, Nehalem, Enright, Timber, Fairdale, and Blaine) in the discontinued 15' map series. The author manuscripts (ink on mylar) were scanned using a Tektronix 4991 monochrome scanner with a resolution of 304.8 dots per inch. The scanned images were vectorized and transformed from scanner coordinates to projection coordinates using digital tics at quadrangle corners. The scanned lines were edited interactively using ALACARTE, unit boundaries were tagged as a contact or fault as appropriate, and scanning artifacts visible at 1:24,000 were removed.
    Base Map layers were prepared from scale-stable printing negatives at 1:48,000 scale, of the U.S. Geological Survey Tillamook (1955 edition), Nehalem (1955 edition), Enright (1955 edition), Timber (1955 edition), Fairdale (1955 edition), and Blaine (1955 edition) 15' topographic maps. This old base was used because there were no funds for digitizing the 24 7.5' bases and because a base derived from 7.5' quadrangles was unsuitable for plotting images of the entire map area. Scanned and vectorized images were transformed from scanner coordinates to projection coordinates using digital tics at map corners. Scanning artifacts are common in the base map coverages, and they were not removed.
    Date: 25-Aug-2000 (process 2 of 2)
    Creation of original metadata record Person who carried out this activity:
    Jennifer Lenz
    US Geological Survey
    12201 Surise Valley Drive, Mail Stop 918
    Reston, VA
    USA

    703-648-6974 (voice)
    703-648-6560 (FAX)
    pschweitzer@usgs.gov
  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?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Complete
  5. How consistent are the relationships among the observations, including topology?
    The database is largely compiled from new mapping at 1:48,000 and 1:24,000 scales by the authors, in combination with published and unpublished previous work.

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: None
  1. Who distributes the data set? (Distributor 1 of 1)
    USGS Information Services
    Box 25286, Denver Federal Center
    Denver, Colorado
    USA

    1-888-ASK-USGS (voice)
    1-303-202-4695 (FAX)
    infoservices@usgs.gov
  2. What's the catalog number I need to order this data set? US Geological Survey Open-File Report 95-0670
  3. What legal disclaimers am I supposed to read?
    This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
    This database, identified as "Geologic map of the Tillamook Highlands, Northwest Oregon Coast Range: A digital database," has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.
  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/open-file/95-670/metadata.faq.html>
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