Spatial digital database for the geology of the San Pedro River basin in Cochise, Gila, Graham, Pima, and Pinal Counties, Arizona

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Frequently anticipated questions:

What does this data set describe?

Title:
Spatial digital database for the geology of the San Pedro River basin in Cochise, Gila, Graham, Pima, and Pinal Counties, Arizona
Abstract:
This open-file report is a digital representation of the Dickinson (1993, 1998, 2000) remapping of the post-Mid- Miocene Quiburis Formation in southeastern Arizona. It delineates constituent facies of the Formation throughout the San Pedro trough.
  1. How might this data set be cited?
    Bolm, Karen S., Lewis, Tasha, Hirschberg, Douglas M., Pitts, G. Stephen, and Dickinson, William R., 2002, Spatial digital database for the geology of the San Pedro River basin in Cochise, Gila, Graham, Pima, and Pinal Counties, Arizona: U.S. Geological Survey Open-File Report 02-393, U.S. Geological Survey, Menlo Park, CA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -110.99145886
    East_Bounding_Coordinate: -110.23607166
    North_Bounding_Coordinate: 33.1602919
    South_Bounding_Coordinate: 32.15710412
  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):
      • Point (430)
      • String (2253)
      • GT-polygon composed of chains (431)
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 12
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 1.000000
      Longitude_of_Central_Meridian: -111.000000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 0.000000
      False_Northing: 0.000000
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.1090807765722
      Ordinates (y-coordinates) are specified to the nearest 0.1090807765722
      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 1/294.98.
  7. How does the data set describe geographic features?
    quib24k.aat
    Geologic units, their labels and descriptions
    linecode
    Numeric code used to identify type of linear feature. Linecodes < 100 are used for contacts and boundaries which are described in the QUIB24K.CO3 file.Linecodes > 100 and < 600 represent structural features which are described in the QUIB24K.ST3 file.Linecodes > 800 and < 900 represent linear geologic units which are described in QUIB24K.LGU
    name
    Name given to structural feature
    source
    Numeric code used to identify the data source for the linear feature. Complete references for the sources are listed in the QUIB24K.REF file.
    desc
    Written description of feature
    quib24k.co3
    Attribute description for items in the contact (and boundary) look-up table
    linecode
    Numeric code (a value < 100) used to identify type of contact or boundary. (This item also occurs in QUIB24K.AAT.)
    symbol
    Line symbol number used by Arc/Info to plot lines. Symbol numbers refer to the GEOL_DIA.LIN lineset. descriptions for items in the contact (and boundary) look-table
    type
    Major type of line, for example, contact, state boundaries, lines of latitude and longitude used for neatlines. descriptions for items in the contact (and boundary) look-table
    modifier
    Line type modifier, for example, approximate, concealed, gradational. No entry implies "known." descriptions for items in the contact (and boundary) look-table
    certainty
    Degree of certainty of contact or boundary, for example, inferred, uncertain. No entry implies "certain."
    desc
    (Source: Written description or explanation of contact or boundary.)
    quib24k.st3
    Attribute description for items in the structure look-up table
    linecode
    Numeric code (a value > 100 and < 600) used to identify type of structural feature. (This item also occurs in QUIB24K.AAT.)
    symbol
    Line symbol number used by ArcInfo to plot arc (line). Symbol numbers refer to the GEOL_DIA.LIN lineset.
    type
    Major type of structure, for example, fault, fracture, fold, other.
    horizontal
    Type of horizontal fault movement, for example, left- lateral, right-lateral. No entry implies "unknown."
    vertical
    Type of vertical fault movement, for example, normal. No entry implies "unknown."
    fold
    Type of fold, for example, anticline, syncline.
    plunge
    Type of plunge on fold, for example, horizontal, plunging, plunging in, plunging out.
    accuracy
    Line type modifier indicating degree of accuracy, for example, approximately located, concealed, gradational. No entry implies "known."
    certainty
    Degree of certainty of contact or boundary, for example, inferred, uncertain. No entry implies "certain."
    desc
    Written description or explanation of structural feature.
    quib24k.lgu
    Attribute descriptions for items in the linear geologic unit look-up table
    linecode
    Numeric code (a value > 800 and < 900) used to identify type of structural feature. (This item also occurs in QUIB24K.AAT.)
    unit
    Numeric code used to identify the rock unit which is described in the QUIB24K.RU look-up table. (This item also occurs in QUIB24K.RU.)
    label
    Rock unit label (abbreviation) used to label unit on map. (This item is also located in the QUIB24K.RU look-up table.)
    symbol
    Line symbol used by ArcInfo to plot arc (line). Symbol numbers refer to the GEOL_DIA.LIN lineset.
    label-alpha
    Rock unit label (abbreviation)
    label-gaf
    Rock unit label (abbreviation) that uses the GeoAgeFullAlpha font, ver. 1.1 (Richard Koch, personal commun., 2001)
    type
    Major type of line, for example, contact, state boundaries, lines of latitude and longitude used for neatlines
    accuracy
    Line type modifier indicating degree of accuracy, for example, approximately located, concealed, gradational. No entry implies "known."
    certainty
    Degree of certainty of contact or boundary, for example, inferred, uncertain. No entry implies "certain."
    desc
    Written description or explanation of linear geologic unit.
    quib24k.pat
    Descriptions of the items identifying geologic units in the polygon attribute table
    unit
    Numeric code used to identify the rock unit which is described in the QUIB24K.RU look-up table. (This item also occurs in the QUIB24K.RU look-up table.)
    source
    Numeric code used to identify the data source for the rock unit. Complete references for the sources are listed in the QUIB24KK.REF file.
    label-alpha
    Rock unit label (abbreviation) used to label unit on map using standard alpha characters. (This item was joined from the QUIB24K.RU look-up table.)
    desc
    Formal or informal unit name. (This item was joined from the QUIB24K.RU look-up table.)
    surf_unit
    Numeric code used to identify the surficial rock that is described in the QUIB24K.RU look-up table under the item unit. (The item surf_unit does not occur in QUIB24K.RU.) The attribute values for surf_unit are a subset of the attribute values for unit. This item, surf_unit, is attributed only when the underlying bedrock has been identified.
    surf_label
    Surficial rock unit label (abbreviation).
    surf_desc
    Formal or informal surficial rock unit name. (This item was joined from the desc iten in QUIB24K.RU look-up table)
    bedrock
    Numeric code used to identify the bedrock that is described in the QUIB24K.RU look-up table under the item unit. (The item bedrock does not occur in QUIG24K.RU.) The attribute values for bedrock are a subset of the attribute values for unit. This item, bedrock, is attributed only when the underlying bedrock has been identified.
    bed_label
    Bedrock unit label (abbreviation).
    bed_desc
    Formal or informal bedrock unit name. (This item was joined from the desc item in QUIB24K.RU look-up table.
    quib24k.ru
    Attribute descriptions for items in the lithology (rock unit) look-up table
    unit
    Numeric code used to identify rock unit. (This item also occurs in QUIB24K.PAT.)
    label
    Rock unit label (abbreviation) used to label unit on map. This item was calculated equal to "label-gaf" descriptions for items in the lithology (rock unit) look-up table
    symbol
    Shadeset symbol number used by ArcInfo to plot a filled/ shaded polygon. The symbol numbers used in this file refer to the WPGCMYK.SHD shadeset.
    label-alpha
    Rock unit label (abbreviation)
    label-gaf
    Rock unit label (abbreviation) that uses the GeoAgeFullAlpha font, ver. 1.1 (Richard Koch, personal commun., 2001)
    name
    The prefix portion of the rock unit label that does not include subscripts. (If subscripting is not used in the original unit label, then the "name" entry is the same as the "label" entry.)
    ss
    The suffix portion of the geologic unit label that includes subscripts.
    lith
    Major type of lithostratigraphic unit, for example, unconsolidated sediments, sedimentary rocks, metasedimentary rocks, intrusive rocks, extrusive rocks, metamorphic rocks, water, ice.
    desc
    Formal or informal unit name
    minage
    Minimum stratigraphic age of lithologic unit, for example, CRET, TERT, M PROT.
    maxage
    Maximum stratigraphic age of lithologic unit
    desc1
    Detailed description of rock unit
    desc2
    Detailed description of rock unit (continued from desc1, if needed)
    desc3
    Detailed description of rock unit (continued from desc2, if needed)
    quib24kp.pat
    Descriptions of the items identifying geologic map symbols are given in the point attribute table
    pnttype
    Basic type of geologic point data being represented (for example, inclined foliation, fault attitude, etc). (This item also occurs in the QUIB24KP.SYM file.)
    symbol
    Marker symbol number used by ArcInfo to identify type of geologic map symbol. Symbol numbers refer to the SCAMP2D.MRK markerset (Matti and others, 1997). (This item also occurs in the QUIB24KP.SYM file.)
    strike
    Strike of bedding, foliation or cleavage. Strike is an azimuthal angle (measured in degrees from 0 to 360 in a clockwise direction from North).
    dip
    Dip of bedding, foliation or cleavage. This value is an angle measured (in degrees from 0 to 90) down from the horizontal; thus a horizontal dip is 0 degrees and a vertical dip is 90 degrees.
    ai_ang
    An interim value used to calculate sym$angle. The various structural map symbols in the SCAMP2D.MRK markerset (Matti and others, 1997) had to be rotated by different amounts to achieve their proper map orientation. For the strike and dip symbols, ai_ang = strike -270.
    sym$ang
    The angle used to complete the mathematical rotation of the structural map symbol to its proper orientation on the map. The various point symbols in the SCAMP2D.MRK markerset (after Matti and others, 1997) had to be rotated by different amounts to achieve their proper map orientation. This value is the $angle pseudoitem value for the point.
    source
    Numeric code used to identify the data source for the structural map symbol. Complete references for the sources are listed in the QUIB24KP.REF file.
    quib24kp.sym
    Attribute descriptions for items in the geologic map symbols look-up table
    pnttype
    Type of point symbol, for example, strike and dip of inclined bedding, strike and dip of inclined cleavage. This item also occurs in the QUIB24KP.PAT file.)
    symbol
    Marker symbol number used by ArcInfo to identify type of structural map symbol. Symbol numbers refer to the SCAMP2D.MRK markerset (Matti and others, 1997). descriptions for items in the geologic map symbols look-up table
    desc
    Written description or explanation of map symbol.
    quib24k.ref and quib24kp.ref
    Descriptive source or reference information for the quib24k and quib 24kp ArcInfo datasets
    source
    Numeric code used to identify the data source. (This item also occurs in the QUIB24K.AAT, QUIB24K.PAT, and QUIB24KP.PAT files.)
    scale
    Scale of source map. (This value is the denominator of the proportional fraction that identifies the scale of the map that was digitized or scanned to produce the digital map.)
    authors
    Author(s) or compiler(s) of source map entered as last name, first name or initial, and middle initial.
    year
    Source (map) publication date
    reference
    Remainder of reference in USGS reference format.
    Entity_and_Attribute_Overview:
    The "Spatial Digital Database for the Geology of the San Pedro River Basin in Cochise, Gila, Graham, Pima, and Pinal Counties, Arizona" report (quib24k.pdf) contains a detailed description of each attribute code and a reference to the associated map symbols in the map source materials. The database includes a geologic linework arc attribute table, quib24k.aat, that relates to the quib24k.co3 (contact look-up table), quib24k.st2 (structure look-up table), quib24k.lgu (linear geologic units look-up table), and quib24k.ref (source reference look-up table) files and a rock unit polygon attribute table, quib24k.pat, that relates to the quib24k.ru (rock unit look-up table) and quib24k.ref (source reference look-up table) files. Associated with this database is a geologic marker point attribute table, quib24kp.pat that relates to quib24kp.sym (symbol description look-up table) and quib24kp.ref (source reference look-up table).
    Entity_and_Attribute_Detail_Citation: http://pubs.usgs.gov/of/2002/0393/pdf/of02-393.pdf

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Karen S. Bolm
    • Tasha Lewis
    • Douglas M. Hirschberg
    • G. Stephen Pitts
    • William R. Dickinson
  2. Who also contributed to the data set?
    Karen S. Bolm and Tasha Lewis digitized these data from scans of the Dickinson (1993, 1998, 2000) maps made by G. Stephen Pitts. Douglas M. Hirschberg provided programs to aid in attribution of the data, and William R. Dickinson provided attribute information, assisted in the editing, and resolved problems resulting from the combination of three maps.
  3. To whom should users address questions about the data?
    Karen S. Bolm
    U.S. Geological Survey
    Physical Scientist
    520 North Park Avenue #355
    Tucson, AZ
    USA

    (520) 670-5544 (voice)
    (520) 670-5113 (FAX)
    kbolm@usgs.gov

Why was the data set created?

This dataset was developed to provide geologic map GIS of the Quiburis Formation for use in future spatial analysis by a variety of users. These data can be printed in a variety of ways to display various geologic features or used for digital analysis and modeling. It was digitized from 1:24,000-scale maps. The digital database is not meant to be used or displayed at any scale larger than 1:24,000 (for example, 1:12,000).

How was the data set created?

  1. From what previous works were the data drawn?
    Dickinson (1993) (source 1 of 3)
    Dickinson, William R., 1993, Summary Geologic Map of the Black Hills near Mammoth; Pinal County, Arizona: Arizona Geological Survey Contributed Map CM-93-B, Arizona Geological Survey, Tucson, AZ.

    Type_of_Source_Media: mylar
    Source_Scale_Denominator: 24000
    Source_Contribution:
    Dickinson (1993) was one of the three sources of geologic information uesd to compile the QUIB24K database.
    Dickinson (1998) (source 2 of 3)
    Dickinson, William R., 1998, Facies Map of Post-Mid-Miocene Quiburis Formation, San Pedro Trough, Pinal, Pima, Gila, Graham, and Cochise Counties, Arizona: Arizona Geological Survey Contributed Map CM-98-A, Arizona Geological Survey, Tucson, AZ.

    Type_of_Source_Media: mylar
    Source_Scale_Denominator: 24000
    Source_Contribution:
    Dickinson (1998) was one of the three sources of geologic information used to compile the QUIB24K database.
    Dickinson (2000) (source 3 of 3)
    Dickinson, William R., 2000, Summary of Tertiary Stratigraphic and Structural Relationships, Camp Grant-Antelope Peak Area, Pinal County, Arizona: Arizona Geological Survey Contributed Map CM-00-B, Arizona Geological Survey, Tucson, AZ.

    Type_of_Source_Media: mylar
    Source_Scale_Denominator: 24000
    Source_Contribution:
    Dickinson (2000) was one of the three sources of geologic information uesd to compile the QUIB24K database.
  2. How were the data generated, processed, and modified?
    Date: 2000 (process 1 of 3)
    Twelve 1:24,000-scale mylar maps that comprise three Dickinson (1993, 1998, 2000) reports were scanned by G. Stephen Pitts on a Scanographics CF500/4 scanner using ScanServ 3.5.1 software. Pitts mathmetically generated a tic file with tics of the study area spaced at 2.5' intervals, and Karen S. Bolm rectified the scanned images using ESRI ArcView Image Analysis. Bolm and Tasha Lewis digitized the linework using Geologic Mapping Tools, an ArcView extension developed by William R. Kelley (contractor at the U.S. Geological Survey's Western Regional Mineral Resources Team, Spokane Field Office). Lines and polygons were attributed by Bolm in ArcInfo 7.2.1.
    Points were digitized from the scanned images using digpnt.aml, and attribution was retrieved for annotation using getdip.aml, both programs written by Douglas M. Hirschberg.
    Date: 2002 (process 2 of 3)
    After review, it was decided to merge the three Dickinson (1993, 1998, 2000) maps into a single spatial digital database. The coverages were merged by Karen S. Bolm, and discrepancies were resolved by her and William R. Dickinson. Some additional contacts had to be added to separate units that were originally on the edges of the mapped areas. Duplicate lines and points were removed. Maps were plotted at 1:24,000 and checked for errors.
    Date: 10-Oct-2002 (process 3 of 3)
    Creation of original metadata record Person who carried out this activity:
    U.S. Geological Survey
    Attn: Karen Sue Bolm
    Physical Scientist
    520 North Park Avenue #355
    Tucson, AZ
    USA

    (520) 670-5544 (voice)
    (520) 670-5113 (FAX)
    kbolm@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?
    When the digitized maps were printed and compared to the Dickinson (1998) mylar originals, a considerable north/south distortion was discovered. The mylar originals were compared to topographic maps of the same area and it was determined that the distortion was due to the mylars becoming stretched during repetitive copy processing. Because of this distortion of the Dickinson(1998) maps, it is difficult to estimate the accuracy of this digital map.
    Accuracy of the digitized versions of the Dickinson (1993, 2000) maps was verified by manual comparison of the source with hard copy printouts and plots and with screen images.
  2. How accurate are the geographic locations?
    Due to distortions in the original maps, it was impossible to test the accuracy of the digital mapping of the Dickinson (1998) maps. Based on testing of the the Dickinson (1993, 2000) maps, it is estimated that the features are accurate to within 24 meters.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Some of the units at the edge of the Dickinson (1993, 1998, 2000) maps were labeled, but accurate contacts were not defined. In those cases, either units were attributed as "unmapped" or not included on the digital version or new contacts were added by William R. Dickinson. Some labeling, which could not be easily included as attribution, was omitted. Also, some of the symbolization chosen for this dataset is different than that used by Dickinson (1993, 1998, 2000). This was done to standardize products.
    The original Dickinson (1993, 1998, 2000) maps were drawn on topographic background. Digital versions of those topographic maps are not included with this dataset.
  5. How consistent are the relationships among the observations, including topology?
    Polygon and chain-node topology present.
    The Dickinson (1993, 1998, 2000) maps were digitized by Karen S. Bolm and Tasha Lewis. Attributes have the same meaning throughout the maps. In some cases, however, units and lines symbols were not consistent from one map to the other. In those cases, one attribute had to be chosen over the other.

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:
This digital database is not meant to be used or displayed at any scale larger than 1:24,000 (for example, 1:12,000).
Any hardcopies utilizing this dataset shall clearly indicate their source. If the user has modified the data in any way, he is obligated to describe the types of modifications he has performed on the hardcopy map. User specifically agrees not to misrepresent this dataset nor to imply that changes he made were approved by the U.S. Geological Survey.
  1. Who distributes the data set? (Distributor 1 of 1)
    USGS Information Services
    Box 25286 Denver Federal Center
    Denver, CO
    USA

    1-888-ASK-USGS (voice)
    303-202-4693 (FAX)
    ask@usgs.gov
  2. What's the catalog number I need to order this data set?
  3. What legal disclaimers am I supposed to read?
    The U.S. Geological Survey (USGS) provides these geographic data "as is." The USGS makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. The USGS further makes no warranties, either expressed or implied, as to any other matter whatsoever, including, without limitation, the condition of the product or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on computers at the USGS, no warranty, expressed or implied, is made by the USGS regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty.
    In no event shall the USGS have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the geographic data or arising out of the delivery, installation, operation, or support by USGS.
    The digital geologic map GIS of the Quiburis Formation and adjacent units is not meant to be used or displayed at any scale larger than 1:24,000 (for example, 1:12,000 or 1:2,000).
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 10-Jun-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/02-393/metadata.faq.html>
Generated by mp version 2.9.48 on Tue Jul 03 20:06:10 2018