Bedrock geologic map of the Hartland and North Hartland quadrangles, Windsor County, Vermont, and Sullivan and Grafton Counties, New Hampshire

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Frequently anticipated questions:

What does this data set describe?

Title:
Bedrock geologic map of the Hartland and North Hartland quadrangles, Windsor County, Vermont, and Sullivan and Grafton Counties, New Hampshire
Abstract:
The bedrock geology of the 7.5- by 15-minute Hartland and North Hartland, VT-NH quadrangles consists of deformed Ordovician to Cretaceous crystalline metamorphic and intrusive igneous rocks. The database includes contacts of bedrock geologic units, faults, outcrops, structural geologic information, and photographs.
  1. How should this data set be cited?

    Walsh, Gregory J. , 2016, Bedrock geologic map of the Hartland and North Hartland quadrangles, Windsor County, Vermont, and Sullivan and Grafton Counties, New Hampshire: Scientific Investigations Map 3361, U.S. Geological Survey, Reston, Virginia.

    Online Links:

    Other_Citation_Details:
    Walsh, G.J., 2016, Bedrock geologic map of the Hartland and North Hartland quadrangle, Windsor County, Vermont, and Sullivan and Grafton Counties, New Hampshire: U.S. Geological Survey Scientific Investigations Map 3361, 2 sheets, scale 1:24,000.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -72.50
    East_Bounding_Coordinate: -72.25
    North_Bounding_Coordinate: 43.625
    South_Bounding_Coordinate: 43.50

  3. What does it look like?

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

    Beginning_Date: 2010
    Ending_Date: 2016
    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 (347)
      • Label point (137)
      • GT-polygon composed of chains (137)
      • Point (4)

    2. What coordinate system is used to represent geographic features?

      Grid_Coordinate_System_Name: State_Plane_Coordinate_System SPCS_Zone_Identifier

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.000100
      Ordinates (y-coordinates) are specified to the nearest 0.000100
      Planar coordinates are specified in feet

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.

  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:
    The geologic data layers in the GIS database of this report include (1) CartographicLines; (2) ContactsAndFaults; (3) DataSourcePolys; (4) HartlandVTWater; (5) MapUnitPolys; (6) NorthHartlandWater; (7) OrientationPoints; (8) OtherPolysOutcrops; and (9) Photos. Includes polygon and arc data layers of bedrock geologic map units, contacts, and faults, including a polygon attribute table. Includes polygon and arc data layers of bedrock outcrops. Includes point locations and photographs of geology. Includes point data of structural observations. Includes polygon and arc data layers of surface water from the topographic maps.
    Entity_and_Attribute_Detail_Citation: <https://dx.doi.org/10.3133/sim3361>

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 map supersedes Walsh (1998) and part of Lyons (1955). Walsh, G.J., 1998, Digital bedrock geologic map of the Vermont part of the Hartland quadrangle, Windsor County, Vermont: U.S. Geological Survey Open-File Report 98-123, 17 p., scale 1:24,000. Lyons, J.B., 1955, Geology of the Hanover quadrangle, New Hampshire-Vermont: Geological Society of America Bulletin, v. 66, no. 1, scale 1:62,500.

  3. To whom should users address questions about the data?

    U.S. Geological Survey
    Attn: Gregory J. Walsh
    Research Geologist
    P.O. Box 628
    Montpelier, Vermont 05602
    USA

    802-828-4528 (voice)
    802-828-4465 (FAX)
    gwalsh@usgs.gov

Why was the data set created?

The bedrock geology was mapped to study the tectonic history of the area and to provide a framework for hydrogeologic characterization of the fractured bedrock of Vermont and New Hampshire. The digital data are intended for use by all government, academic, commercial, or other agencies in need of digital geologic map information. The report contains a GIS database, two large-format color sheets in Adobe Portable Document Format (PDF), metadata, and a readme.txt file.

How was the data set created?

  1. From what previous works were the data drawn?

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

    Date: 2014 (process 1 of 1)
    Geology mapped by Walsh in 1995-1996 in Vermont and 2010-2012 in New Hampshire; assisted by Bart T. Cubrich. A preliminary version of the geology of the Hartland quadrangle was published by Walsh (1998). This report supersedes the report by Walsh (1998). This report also supersedes the mapping by Lyons (1955) in the southern half of the Hanover 15-minute quadrangle. The bedrock geology was mapped using standard techniques. Location information during modern mapping (2010-2012) was collected with a GPS receiver (GPS model: Garmin eTrex Venture). Locational data for data mapped in 1995-1996 was obtained by pace, compass, and altimeter and digitized by Walsh. The line and polygon data were compiled in Adobe Illustrator over the topographic basemap. Field and compilation sheets were scanned and registered in Illustrator. Topographic basemap separates were scanned at 400 dpi. Line and polygon data were exported from Illustrator in DXF format to Arc/Info version 10.0. Point data collected in 2010-2012 were collected with GPS imported to ArcGIS version 10.0 to create shapefiles. Point attribute data were entered in an Excel spreadsheet and joined to the GPS data in ArcGIS. Strike and dip data from Walsh (1998) were heads-up digitized in Arc/Info Workstation. The GPS data were collected in latitude and longitude in degrees minutes and seconds in WGS84 datum. GPS data were projected to the New Hampshire Stateplane coordinate system (FIPS Zone 2800) in NAD83 datum, with units in feet. GPS locations were compared to the topographic basemap of the area and repositioned to match the base. The original coordinates remain in the OrientationPoints Feature Class. After editing in Arc/Info, all arcs, polygons, and points were converted to shapefiles. Data in the Vermont State Plane coordinate system were re-projected to the New Hampshire State Plane coordinate system. Line and polygon data were edited in Arc/Info and converted to shapefiles. Shapefiles were plotted in ArcMap and exported to Illustrator. Final cartography was done in Adobe Illustrator. Shapefiles were converted to Feature Classes in an ESRI ArcGIS geodatabase. Meghan E. Mason assisted with geodatabase conversion.

    Person who carried out this activity:

    Gregory J. Walsh
    U.S. Geological Survey
    Geologist
    P.O. Box 628
    Montpelier, Vermont 05602
    USA

    802-828-4528 (voice)
    802-828-4465 (FAX)
    gwalsh@usgs.gov

    Hours_of_Service: 0900 to 1700 Eastern Standard Time
    Data sources produced in this process:
    • Walsh (2016)

  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 attributes digitized during the creation process were verified by displaying the lines and points in the database with respect to the USGS 7.5-minute topographic base map (1:24,000 scale), but no formal tests were performed.

  2. How accurate are the geographic locations?

    The data were created on a USGS 7.5-minute topographic map at 1:24,000 scale. Therefore, the horizontal accuracy is assumed to be within National Map Accuracy Standards, with a horizontal accuracy of 45.6 feet at the 95% confidence level. Locational information in the field was provided by a Garmin eTrex Venture GPS receiver.

  3. How accurate are the heights or depths?

    The data were delineated on a USGS 7.5-minute topographic map at 1:24,000 scale. Therefore, the vertical accuracy is assumed to be within National Map Accuracy Standards, with a vertical accuracy of 11.9 feet at the 95% confidence level.

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

    The geologic contacts were delineated on a USGS 7.5-minute topographic map based on observations at the outcrops shown in the database. Not all outcrops within the area were identified or visited during mapping. The geologic contacts might change if additional outcrops are discovered or exposed as the natural land changes or as the result of development. The features in the database are not based on legal parcels or definitions.

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

    These data are believed to be logically consistent, though no tests were performed. Geometry is topologically clean.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:
Although all data released in this report have been used by the U.S. Geological Survey (USGS), no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and (or) the functioning of the software. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Use_Constraints: none

  1. Who distributes the data set? (Distributor 1 of 1)

    U.S. Geological Survey
    Box 25286, Denver Federal Center
    Denver, Colorado 80225
    USA

    1-888-ASK-USGS (voice)
    ask@usgs.gov

    Hours_of_Service: 0900 to 1700 Mountain Standard Time
  2. What's the catalog number I need to order this data set?

    USGS Scientific Investigations Map 3361

  3. What legal disclaimers am I supposed to read?

    These data were prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, product or process disclosed in this report, and represents 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 and related materials. Reference therein to any specific commercial product, process, or related service by trade name, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.

  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 06-Jul-2016
Metadata author:
USGS
Attn: Gregory J. Walsh
Research Geologist
P.O. Box 628
Montpelier, Vermont 05602
USA

802-828-4528 (voice)

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

Generated by mp version 2.9.14 on Wed Jul 06 15:27:40 2016