Bedrock Geologic Map of the Windham Quadrangle, Rockingham and Hillsborough Counties, New Hampshire: Brittle geologic structure data

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Frequently anticipated questions:

What does this data set describe?

Title:
Bedrock Geologic Map of the Windham Quadrangle, Rockingham and Hillsborough Counties, New Hampshire: Brittle geologic structure data
Abstract:
Cartographic point coverage for brittle geologic structure data.
The geologic data was mapped during the summer of 1998 at a scale of 1:24,000. The bedrock geology was mapped using standard techniques. Locational information was provided by Rockwell PLGR+96 GPS receivers using the federal precise positioning service.
The line and polygon data were compiled on a mylar greenline of the 7.5-minute quadrangle and scanned at 400 dpi on an Anatech Eagle 4080T scanner. The raster files (TIF) were converted to vector files (DXF) using GTX OSR version 2.0 raster-to-vector conversion software. The vector files were imported to Arc/Info version 7.0.4. Point data were collected with GPS and hand held 3COM Palm Pilot III PDA computers. Data from the PDAs were combined in Microsoft Access, and then imported as ASCII text files and (dbf) files into Arc/Info. The Arc/Info coverages were registered and transformed to the New Hampshire State Plane Coordinate system.
Supplemental_Information:
The geology dataset was printed and visually reviewed by the map authors and other USGS staff for geologic integrity, completeness, and accuracy of linework. The report received a standard internal peer review as per USGS Open-File Reports.
  1. How might this data set be cited?
    Walsh, Gregory J., and Stewart F. Clark, Jr., 1999, Bedrock Geologic Map of the Windham Quadrangle, Rockingham and Hillsborough Counties, New Hampshire: Brittle geologic structure data: U.S. Geological Survey Open-File Report 99-8, U.S. Geological Survey, Reston, Virginia.

    Online Links:

    Other_Citation_Details: scale 1:24,000
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -71.37654877
    East_Bounding_Coordinate: -71.24942017
    North_Bounding_Coordinate: 42.8742981
    South_Bounding_Coordinate: 42.74655533
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  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 Point data set. It contains the following vector data types (SDTS terminology):
      • Point (1095)
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitude and longitude values are specified in Decimal Degrees. 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 6,378,206.4.
      The flattening of the ellipsoid used is 1/294.98.
  7. How does the data set describe geographic features?
    JOINT.PAT
    point attribute table for brittle geologic symbols (Source: authors)
    STATION
    field station number (Source: authors)
    POSFMT
    position format from PLGR+96 GPS unit (Source: authors)
    ValueDefinition
    UTM/UPS 
    ZONE
    UTM zone from PLGR+96 GPS unit (Source: authors)
    ValueDefinition
    19T 
    HDATUM
    horizontal datum from PLGR+96 GPS unit in NAD27-CONUS (Source: authors)
    ValueDefinition
    NAS-C 
    HRZERR
    horizontal error from PLGR+96 GPS unit in feet (Source: authors)
    Range of values
    Units:feet
    ELEV
    elevation from PLGR+96 GPS unit in feet
    Range of values
    Units:feet
    VDATUM
    vertical datum from PLGR+96 GPS unit in World Geodetic System (WGS-84) (Source: authors)
    ValueDefinition
    WGD 
    ELEVUNIT
    elevation unit from PLGR+96 GPS unit in feet (Source: authors)
    ValueDefinition
    ft 
    TYPE
    type of geologic point data (Source: authors)
    ValueDefinition
    planar 
    linear 
    other 
    SUB_TYPE
    secondary type of geologic point data (Source: authors)
    ValueDefinition
    schistosity 
    cleavage 
    bedding 
    axial surface 
    fold axis 
    STRIKE
    geologic strike of planar point data measured in right-hand rule in degrees (Source: authors)
    Range of values
    Minimum:0
    Maximum:359
    Units:decimal degrees
    Resolution:1
    DIP
    geologic dip of planar data and plunge of linear data in degrees (Source: authors)
    Range of values
    Minimum:0
    Maximum:90
    Units:decimal degrees
    Resolution:1
    DIPDIR
    geologic dip direction of planar data or trend of linear data in degrees (Source: authors)
    Range of values
    Minimum:0
    Maximum:359
    Units:decimal degrees
    Resolution:1
    REL_AGE
    relative age of geologic point data (Source: authors)
    ValueDefinition
    n-1 
    n 
    n+1 
    n+2 
    SYMBOL
    symbol number from geologic lineset used for plotting (Source: authors)
    SYMBOL_ANG
    symbol angle in degrees used for rotation of symbols (Source: authors, calculated from strike and dip direction)
    Range of values
    Minimum:0
    Maximum:359
    Units:decimal degrees
    Resolution:1
    ROTATION
    rotation sense of minor folds as viewed down plunge or offset on faults (Source: authors)
    ValueDefinition
    cccounterclockwise
    cwclockwise
    SPACING
    spacing of joints in joint sets in meters (Source: authors)
    Range of values
    Units:meters
    WIDTH
    width of fracture zone in meters
    Range of values
    Units:meters
    NETSLIP
    net slip of minor faults in meters
    Range of values
    Units:meters
    APERTURE
    aperture of joint openings in meters
    Range of values
    Units:meters
    MIN1
    primary mineral in veins (Source: authors)
    ValueDefinition
    modified after Kretz (1983) American Mineralogist, v. 68, p. 277-279 
    MIN2
    secondary mineral in veins (Source: authors)
    Formal codeset
    Codeset Name:modified Kretz
    Codeset Source:Kretz (1983) American Mineralogist, v. 68, p. 277-279
    MIN3
    tertiary mineral in veins (Source: authors)
    Formal codeset
    Codeset Name:modified Kretz
    Codeset Source:Kretz (1983) American Mineralogist, v. 68, p. 277-279
    LITH
    geologic unit label designators for dikes, same as code (Source: authors)
    ValueDefinition
    Dg 
    Dp 
    Md 
    Mdp 
    Sagdg 
    TOPOFEAT
    topographic feature parallel to geologic structure (Source: authors)
    ValueDefinition
    valley 
    CODE
    geologic unit label designators for dikes, same as lith (Source: authors)
    ValueDefinition
    Dg 
    Dp 
    Md 
    Mdp 
    Sagdg 

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Gregory J. Walsh
    • Stewart F. Clark, Jr.
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?

Why was the data set created?

The map was published as part of a study of the fractured bedrock aquifers in the state of New Hampshire. The digital data are intended for use by all government, academic, commercial, or other agencies in need of digital geologic map information.
Not intended for use at scales larger than 1:24,000.

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?
    Walsh, Gregory J., and Stewart F. Clark, Jr., 1999, Bedrock Geologic Map of the Windham Quadrangle, New Hampshire: U.S. Geological Survey Open-File Report 99-8, U.S. Geological Survey, Reston, Virginia.

    Online Links:

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

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints:
Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness or any information, apparatus, product or process disclosed in this report, or represents that its use would not infringe privately owned rights. The act of distribution shall not constitute any such warranty and no responsibility is assumed by the USGS in the use of this data, or related materials. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
This geologic map is a guide to the bedrock geology at 1:24,000 scale, but it is not a substitute for site specific data.
  1. Who distributes the data set?[Distributor contact information not provided.]
  2. What's the catalog number I need to order this data set?
  3. What legal disclaimers am I supposed to read?
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 14-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:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://geo-nsdi.er.usgs.gov/metadata/open-file/99-8/joint.faq.html>
Generated by mp version 2.9.48 on Tue Jul 03 20:07:26 2018