Bedrock Data from Western Cape Cod, Massachusetts (WELLSITE shapefile, Geographic, NAD27)

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Frequently anticipated questions:

What does this data set describe?

Title:
Bedrock Data from Western Cape Cod, Massachusetts (WELLSITE shapefile, Geographic, NAD27)
Abstract:
Cores collected from recent drilling in western Cape Cod, Massachusetts provide insight into the topography and petrology of the underlying bedrock. Cores from 64 drill sites spread over a approximately 140 km2 study area produced samples of granitoids (31), orthogneisses (20), basalts/diabases (4), amphibolites (3), felsic mylonites (2), and dolomitic rock (2). Granitoid composition ranges from granite to tonalite and quartz diorite, but it is dominated by two-feldspar granites. Hydrothermal alteration is common in nearly all cores as evidenced by the secondary growth of chlorite and epidote. Granitoids resemble rocks of the Dedham and Fall River plutons (Wones and Goldsmith, 1991). Gneisses generally contain the mineral assemblage K-feldspar+plagioclase+quartz+/-biotite+/- chlorite+/-muscovite+/-sphene+/-epidote+oxides. Amphibolites contain the assemblage hornblende+plagioclase+quartz+biotite+epidote+/-chlorite+/-sphen+/-K-feldspar+/-sericite+ oxides. Peak metamorphic grade based on mineral assemblages is estimated at lower amphibolite facies. X-ray powder diffraction of unmetamorphosed dolomitic cores shows presence of layered silicates (clays), plagioclase, and possible magnesite. Contours of the bedrock surface show locally irregular topography suggesting erosion by glacial scour. Lithologic distribution mapping suggests a possible continuation of the New Bedford gneissic terrane that outcrops 25 km to the west. Dolomitic rocks may represent a lithified fault gauge material at the eastern edge of the gneissic zone. Basalts/diabases are interpreted to be post-metamorphic dikes associated with Mesozoic rifting.
  1. How might this data set be cited?
    U.S. Geological Survey, 20030505, Bedrock Data from Western Cape Cod, Massachusetts (WELLSITE shapefile, Geographic, NAD27): Open-File Report 03-221, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    Hallett, B.W., Paskevich, V.F., Poppe, L.J., Brand, S.G., and Blackwood, D.S., 2003, A Pictorial Survey of the Bedrock Beneath Western Cape Cod, Massachusetts: Open-File Report 03-221, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details: 1 CD-ROM
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -70.615932
    East_Bounding_Coordinate: -70.501960
    North_Bounding_Coordinate: 41.667870
    South_Bounding_Coordinate: 41.611070
  3. What does it look like?
    wellsite (GIF)
    Image showing the distribution of the wellsite locations in Western Cape Cod, Massachusetts.
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2004
    Currentness_Reference:
    publication date
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: vector digital data
  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):
      • Entity point (64)
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.00001. Longitudes are given to the nearest 0.000001. 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 6378206.400000.
      The flattening of the ellipsoid used is 1/294.978698.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: National Geodetic Vertical Datum of 1929
      Altitude_Resolution: 0.01
      Altitude_Distance_Units: m
      Altitude_Encoding_Method: Attribute values
      Depth_System_Definition:
      Depth_Datum_Name: Mean sea level
      Depth_Resolution: 0.01
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Attribute values
  7. How does the data set describe geographic features?
    wellsite
    Shapefile Attribute Table (Source: ESRI)
    FID
    Internal feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.
    Shape
    Feature geometry. (Source: ESRI) Coordinates defining the features.
    LOCATION
    Names assigned to designate the wellsite location. (Source: CH2M Hill Scientist) Name of wellsite location (characters and numerics)
    LATITUDE
    Latitude coordinate of well location (Source: CH2M Hill scientist)
    Range of values
    Minimum:41.61107
    Maximum:41.66787
    Units:decimal degrees
    Resolution:0.00001
    LONGITUDE
    Longitude coordinate of well location (Source: CH2M Hill Scientist)
    Range of values
    Minimum:-70.615932
    Maximum:-70.501960
    Units:decimal degrees
    Resolution:0.000001
    ELEVATION
    Elevation of wellsite (ground level) above mean sea level (Source: CH2M Hill Scientist)
    Range of values
    Minimum:12.36
    Maximum:72.18
    Units:meters
    Resolution:0.01
    BEDROCK_EL
    Elevation (depth) of the upper bedrock surface below mean sea level (Source: CH2M Hill Scientist)
    Range of values
    Minimum:-81.65
    Maximum:-37.03
    Units:meters
    Resolution:0.01
    TOC_ELEV
    Elevation of the top of casing above mean sea level. (Source: CH2M Hill Scientist)
    Range of values
    Minimum:13.13
    Maximum:72.94
    Units:meters
    Resolution:0.01
    T_DEPTH
    Total thickness of strata penetrated by the well (Source: CH2M Hill Scientist)
    Range of values
    Minimum:71.93
    Maximum:115.22
    Units:meters
    Resolution:0.01
    CORE_DATE
    Date well was completed (Source: CH2M Hill) Dates in yy/mm/dd notation
    BROCK_LITH
    Brief description of the rock type (Source: USGS Scientist)
    ValueDefinition
    GraniteInformation unavailable from original metadata.
    GranodioriteInformation unavailable from original metadata.
    BasaltInformation unavailable from original metadata.
    Quartz DioriteInformation unavailable from original metadata.
    Quartz MonzoniteInformation unavailable from original metadata.
    OrthogneissInformation unavailable from original metadata.
    DiabaseInformation unavailable from original metadata.
    AmphiboliteInformation unavailable from original metadata.
    DolostoneInformation unavailable from original metadata.
    Dolomitic MudrockInformation unavailable from original metadata.
    TonaliteInformation unavailable from original metadata.
    GranitoidInformation unavailable from original metadata.
    Felsic MyloniteInformation unavailable from original metadata.
    Syenitic MyloniteInformation unavailable from original metadata.
    IMAGE
    Name of the bedrock picture in .jpg format, and the path to that image on the CD-ROM (Source: Scientist) Character string: Photo names and paths
    HOTLINK
    Path to bedrock photo used as hotlink field in ArcView project file. (Source: User Defined) Character string: system environment label and photo name

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • U.S. Geological Survey
  2. Who also contributed to the data set?
    Jacobs Engineering for drilling the wells, S. Brand of CH2M Hill and the Air Force Center for Environmental Excellence for providing access to the well samples and logs, B. Hallett for the petrographic descriptions, and L. Poppe for creating the ArcView shapefile.
  3. To whom should users address questions about the data?
    Lawrence J. Poppe
    U.S. Geological Survey
    Geologist
    U.S. Geological Survey
    Woods Hole, MA
    USA

    (508) 548-8700 x2314 (voice)
    (508) 457-2310 (FAX)
    lopppe@usgs.gov

Why was the data set created?

The purpose of this data layer is to provide those interested in the composition and character of the bedrock beneath western Cape Cod with the ability to examine the well logs and sample descriptions in a geographic context.

How was the data set created?

  1. From what previous works were the data drawn?
    Information unavailable from original metadata. (source 1 of 1)
    Information unavailable from original metadata., Unpublished Material, Information unavailable from original metadata..

    Other_Citation_Details:
    The original metadata file only had publication date, source media, source time period of content, and source currentness reference. Not enough informtaion to fill in the remaining required elements.
    Type_of_Source_Media: disc
    Source_Contribution: Information unavailable from original metadata.
  2. How were the data generated, processed, and modified?
    Date: 05-May-2003 (process 1 of 5)
    The well identifiers, navigation, and bedrock descriptions were compiled in Microsoft Excel and saved as an ASCII text file. The ASCII text file was imported to an ArcView table. The table was later converted to an Event Theme in ArcView and saved as the final shapefile. Person who carried out this activity:
    Lawrence J. Poppe
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2314 (voice)
    (508) 457-2310 (FAX)
    lpoppe@usgs.gov
    Data sources used in this process:
    • wellsite.txt
    Data sources produced in this process:
    • wellsite.shp
    • wellsite.dbf
    • wellsite.shx
    Date: 10-Nov-2015 (process 2 of 5)
    Edits to the metadata were made to fix any errors that MP v 2.9.30 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. The source citation information was sparse, and could not be filled in with any reliability other than with the generic statement. The enumerated domain attribute had to be reformatted. Altitude and depth encoding methods were added. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 20-Jul-2018 (process 3 of 5)
    USGS Thesaurus keywords added to the keyword section. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 18-Nov-2019 (process 4 of 5)
    Crossref DOI link was added as the first link in the metadata. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 08-Sep-2020 (process 5 of 5)
    Added keywords section with USGS persistent identifier as theme keyword. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@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?
    All attributes were checked in a consistent manner.
  2. How accurate are the geographic locations?
    Each wellsite was surveyed; horizontal accuracy to less than 1 meter.
  3. How accurate are the heights or depths?
    Each wellsite was surveyed; vertical accuracy to less than 1 meter.
  4. Where are the gaps in the data? What is missing?
    This data set contains a subset of the wells drilled on the Massachusetts Military Reservation and a subset of the attributes available in the database from this drilling program maintained as part of the Installation Restoration Program there. This data set contains station locations, navigation, well information, and lithologies of the bedrock for 64 locations, 57 of which have associated images.
  5. How consistent are the relationships among the observations, including topology?
    No additional checks for topological consistency were performed on this data.

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:
Public domain data from the U.S. government are freely redistributable with proper metadata and source attribution. The USGS must be referenced as the originator of this data set.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey
    Attn: Lawrence J. Poppe
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-457-2314 (voice)
    508-457-2310 (FAX)
    lpoppe@usgs.gov
  2. What's the catalog number I need to order this data set? Downloadable Data
  3. What legal disclaimers am I supposed to read?
    Although these data have been used by the U.S. Geological Survey (USGS), U.S. Department of the Interior (DOI), no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    These data are available in Environmental Systems Research Institute (ESRI) shapefile format. The user must have ArcGIS or ArcView 3.0 or greater software to read and process the data file. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of the importing data. A free data viewer, arcexplorer, capable of displaying the data is available from ESRI at www.esri.com.

Who wrote the metadata?

Dates:
Last modified: 16-Nov-2021
Metadata author:
U.S. Geological Survey
Attn: Lawrence J. Poppe
Geologist
U.S. Geological Survey
Woods Hole, Massachusetts
USA

(508) 548-8700 x2314 (voice)
(508) 457-2310 (FAX)
whsc_data_contact@usgs.gov
Contact_Instructions:
The metadata contact email address is a generic address in the event the metadata contact is no longer with the USGS or the email is otherwise invalid.
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/open_file_report/ofr2003-221/wellsite.shp.faq.html>
Generated by mp version 2.9.50 on Tue Nov 16 10:06:29 2021