Digital geologic map and database of the Frederick 30 X 60 minute quadrangle, Maryland, Virginia, and West Virginia

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Frequently anticipated questions:


What does this data set describe?

Title:
Digital geologic map and database of the Frederick 30 X 60 minute quadrangle, Maryland, Virginia, and West Virginia
Abstract:
The geology of the Frederick 30 by 60 minute quadrangle, Maryland, Virginia, and West Virginia, was mapped on 1:24,000-scale base maps from 1989 to 1994. The geologic data were manually compiled at 1:100,000-scale in 1997 and were digitized and converted to Arc/Info GIS coverages from 1998 to 1999.
Supplemental_Information:
Geologic data are stored in eleven GIS themes: A-A' and B-B' cross sections, bedrock, dikes, faults, lakebeds, thermally metamorphosed rocks, map neat line, sinkholes, structural, and surficial. Base data are stored in five GIS themes: hydrology, land cover, political boundaries, roads, and elevation contours.
  1. How might this data set be cited?
    Southworth, Scott, Brezinski, David K., Avery Ala Drake, Jr., Burton, William C., Orndorff, Randall C., Froelich, Albert J., Daniels, David L., Reddy, James E., and Denenny, Danielle, 2002, Digital geologic map and database of the Frederick 30 X 60 minute quadrangle, Maryland, Virginia, and West Virginia: U.S. Geological Survey Open-File Report 02-437, U.S. Geological Survey, Reston, Virginia.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -78.00
    East_Bounding_Coordinate: -77.00
    North_Bounding_Coordinate: 39.50
    South_Bounding_Coordinate: 39.00
  3. What does it look like?
    http://pubs.usgs.gov/of/2002/of02-437/02437p1p.gif (GIF)
    Reduced-size image showing the general layout of map sheet. 864x640 pixels, 24-bit color.
    http://pubs.usgs.gov/of/2002/of02-437/02437p2p.gif (GIF)
    Reduced-size image showing the general layout of map sheet. 864x640 pixels, 24-bit color.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 1997
    Ending_Date: 2002
    Currentness_Reference:
    Publication date
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: Vector digital data and 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):
      • Entity point
      • GT-polygon composed of chains
    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 0.001. Longitudes are given to the nearest 0.001. Latitude and longitude values are specified in Decimal degrees. 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.
      The flattening of the ellipsoid used is 1/298.257.
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview:
    The following is a brief description of the data layers, tables, and their associated attributes that are used in this report.
    
    GEOLOGIC DATA:
    ASECTION - Line and polygon data for the A-A' cross section
      ASECTION.AAT items:
        PLOTCODE - Used for plotting
        TYPE - Used to identify faults
      ASECTION.PAT items:
        PLOTCODE - Used for plotting
        MAPUNIT - Geologic map unit code
    
    BEDROCK - Polygon data layer of bedrock geologic map units
      BEDROCK.PAT items:
        MAPUNIT - Bedrock geologic map unit code
    
    BSECTION - Line and polygon data for the B-B' cross section
      BSECTION.AAT items:
        PLOTCODE - Used for plotting
        TYPE - Used to identify faults
      BSECTION.PAT items:
        PLOTCODE - Used for plotting
        MAPUNIT - Geologic map unit code
        META - Used to identify thermally metamorphosed rocks.  Set to 'JTrtm'.
    
    FAULT - Line data layer of geologic faults
      FAULT.AAT items:
        TYPE - Type of fault
          TYPE Code  Description
               N	 Normal
               T     Thrust
              NT     Normal reactivated as thrust
              OT     Overturned thrust
              SS     Strike-slip
             ARO     Arrow showing movement along strike-slip fault
               U     Unclassified
        CODE - Identifies fault segments which are overlaid by surficial deposits
               (CODE = 2).  Used for plotting.
    
    LAKEBED - Line data layer of lakebed locations
      LAKEBED.AAT items:
        TYPE - Set to 'Lakebed'
    
    LINES - Line data layer of geologic cross sections
      LINES.AAT items:
        XLINE - Identifies cross section, set to "A-A'" or "B-B'"
    
    META - Polygon data layer of thermally metamorphosed rocks
      META.PAT items:
        MAPUNIT - Geologic map unit code.  Set to 'JTrtm'.
    
    NEAT - Unattributed line data layer of map neatline
    
    SINK - Point data layer of sinkhole locations
      SINK.PAT items:
        MAPUNIT - Set to 'Sinkhole'
    
    STRUCTURE - Point data layer of geologic structure
      STRUCTURE.PAT items:
        DIP - Dip value (planar data) or plunge value (linear data)
        AZIMUTH - Angle measured from North in right-hand rule (planar data).
        TYPE - Type of geologic structure
          TYPE Code  Description
            AGE      Sample site for U-Pb isotopic technique for age date
             HB      Horizontal bed
            I1C      Inclined first-generation Paleozoic cleavage and (or) schistosity
            I2C      Inclined second-generation Paleozoic cleavage and (or) schistosity
             IB      Inclined bed
             IF      Inclined Middle Proterozoic foliation
             MA      Minor antiform
            MPF      Inclined mylonitic and phyllonitic foliations
             OB      Overturned bed
             QM      Quarry or mine
            RAD      Greater than 200 pCi/L of soil gas radon
            V1C      Vertical first-generation Paleozoic cleavage and (or) schistosity
            V2C      Vertical second-generation Paleozoic cleavage and (or) schistosity
             VB      Vertical bed
             VF      Vertical Middle Proterozoic foliation
        SUB_TYPE - Type of quarry mine
          SUB_TYPE
            Code    Description
             Au     Gold
              C     Chromite
             Cu     Copper
              D     Diabase
              F     Hematite, limonite, and iron-ore
              L     Limestone
              M     Marble
              S     Building stone
             Zn     Zinc
        SYMBOL_ANG - Standard Cartesian angle measured from East.  Used for plotting.
        DIPDIR - Direction of dip (planar data) or trend (linear data) measured from North
        SYMBOL - Symbol number, used for plotting
    
    SURFICIAL - Polygon data layer of surficial geologic map units
      SURFICIAL.PAT items:
        MAPUNIT - Surficial geologic map unit code
    
    ZMD_DIKE - Line and polygon data layer of Zmd dikes
      ZMD_DIKE.AAT items:
        TYPE - Set to 'Zmd'
      ZMD_DIKE.PAT items:
        MAPUNIT - Set to 'Zmd'
    
    02437 - Geologic database
      If you are using Arc/Info Workstation you can access the data in this table using either the
      JOINITEM, RELATE, or CURSOR functions and the INFO item MAPUNIT.  Use the RELATE function to
      access this data from ArcMap.  If you are using ArcView, add the table 02437.DBF to the
      project and use either the JOIN or LINK functions and the item MAPUNIT to access the data.
      Alternatively, the database 02437.MDB can be viewed using Microsoft Access.
        02437 items:
          MAPUNIT - Geologic map unit code
          SURF_BED
          SURFTYPE
          LITHPRI
          LITHSEC
          LITHTER
          FORM
          MEMBER
          GROUP
          SUPERGROUP
          ROCKCLASS
          AGE
          GEOCHR
          GEOCHRTECH
          GEOCHRREF
          FOSSIL
          FOSSILTYPE
          FOSSILREF
          CORRELEXTR
          ORIGIN
          RES
          RESREF
          COLOR
          MINPRI
          MINSEC
          MINOTH
          CLASTPRI
          CLASTSEC
          CEMENT
          THICKAPPRX
          THICKRANGE
          BEDTHIN
          BEDMEDIUM
          BEDTHICK
          CONTUP
          CONTLOW
          FOLPRI
          FOLSEC
          FOLTER
          CMPM
          RMPM
          RMRM
          DEFORMAGE
          DEFORMTECH
          DEFORMREF
          COMMENTS
    
    BASE DATA:
    HYDRO - Line and polygon data layer of hydrographic features
      HYDRO.AAT items:
        ENTITY_LABEL - DLG code
        ENTITY_DEF - Short definition of the DLG code contained in ENTITY_LABEL
        BANK - Defines the right (R) and left (L) limits of a double-line feature when facing downstream
        INTERMITTENT - Defines any hydrographic feature which flows intermittently
        COINCIDENT - Identifies lines shared by two or more hydrographic features
      HYDRO.PAT items:
        ENTITY_LABEL - DLG code
        ENTITY_DEF - Short definition of the DLG code contained in ENTITY_LABEL
        ELEVATION - Water surface elevation, whole meters
    
    NLCD - Raster land cover data set
      NLCD.VAT items:
        VALUE - Land cover code
          VALUE Code  Description
             11      Open water
             21      Low intensity residential
             22      High intensity residential
             23      Commercial/Industrial/Transportation
             32      Quarries/Strip mines/Gravel pits
             33      Transitional
             41      Deciduous forest
             42      Evergreen forest
             43      Mixed forest
             81      Pasture/Hay
             82      Row crops
             85      Urban/Recreational grasses
             91      Woody wetlands
             92      Emergent herbaceous wetlands
        COUNT - Total number of cells belonging to each value code
        SYMBOL - Symbol number, used for plotting
    
    POLBND - Line and polygon data layer of state and county boundaries:
      POLBND.AAT items:
        POLBND-ID
          TYPE - State or county boundary
      POLBND.PAT items:
        STATE_NAME - State in which county resides
        CNTY_NAME - County name
        STATE_FIPS - State FIPS code (character field)
        CNTY_FIPS - County FIPS code (character field)
        FIPS - FIPS code for state/county (character field)
        MAJOR# - DLG code
        MINOR# - DLG code
          Major DLG  Minor DLG
            Code       Code     Description
             91        ---      State FIPS code (integer field)
             92        ---      County FIPS code (integer field)
    
    ROADS - Line data layer of major highways
      ROADS.AAT items:
        MAJOR# - DLG code
        MINOR# - DLG code
          Major DLG  Minor DLG
            Code       Code     Description
            170        201      Primary route, class 1, undivided
            170        203      Primary route, class 1, divided
            170        205      Secondary route, class 2, undivided
            170        207      Secondary route, class 2, divided
            170        209      Road or street, class 3
            170        402      Cloverleaf or interchange
            172        ---      Interstate route number
            173        ---      U.S. route number
            174        ---      State route number
    
    TOPO - Line data layer of elevation contours
      TOPO.AAT items:
        MAJOR# - DLG code
        MINOR# - DLG code
          Major DLG  Minor DLG
            Code       Code     Description
             20        20O      Contour (index or intermediate)
             20        201      Carrying contour
             20        204      Amended contour
             20        208      Closure line
             20        611      Depression
             24        ---      Elevation in whole meters
        TYPE - Type of contour: index (Index) or intermediate (Inter),
               used for plotting
    
    Entity_and_Attribute_Detail_Citation: http://pubs.usgs.gov/of/2002/of02-437/of02437.pdf

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Scott Southworth
    • David K. Brezinski
    • Avery Ala Drake, Jr.
    • William C. Burton
    • Randall C. Orndorff
    • Albert J. Froelich
    • David L. Daniels
    • James E. Reddy
    • Danielle Denenny
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Scott Southworth
    U.S. Geological Survey
    National Center, MS926A
    Reston, Virginia
    USA

    703-648-6385 (voice)
    703-648-6953 (FAX)
    ssouthwo@usgs.gov

Why was the data set created?

The geologic map and database are intended for application to land use decisions, soil mapping, groundwater availability and quality, aggregate resources, and engineering and environmental studies. For site specific studies, the detailed 1:24,000-scale geologic maps should be consulted.

How was the data set created?

  1. From what previous works were the data drawn?
    None (source 1 of 3)
    U.S. Geological Survey, Unpublished material, None.

    Type_of_Source_Media: Stable-base material
    Source_Scale_Denominator: 100000
    Source_Contribution:
    These geologic data were compiled at 1:100,000-scale from a series of 1:24,000-scale detailed published and unpublished field investigations that range in date from 1989 to 1994.
    NLCD (source 2 of 3)
    Multi-resoultion Land Characterization (MRLC) Consortium, 1999, National Land Cover Data.

    Type_of_Source_Media: Online
    Source_Scale_Denominator: 100000
    Source_Contribution:
    The National Land Cover Data set provides a good general land cover classification product for the Frederick 30 X 60 minute quadrangle.
    DLG (source 3 of 3)
    U.S. Geological Survey, Unknown, Digital Line Graphs.

    Type_of_Source_Media: Online
    Source_Scale_Denominator: 100000
    Source_Contribution:
    Digital Line Graphs are digital vector representations of cartographic information derived from USGS maps and related sources.
  2. How were the data generated, processed, and modified?
    Date: 1998 (process 1 of 3)
    These geologic map data were digitized from hand drafted stable-base scribe sheets used to prepare the Frederick 30 X 60 minute quadrangle. Scribe sheets were scanned, vectorized and then converted to GIS compatible formats.
    Date: 2002 (process 2 of 3)
    Land cover data sets for the states of Maryland, Virginia, and West Virginia were obtained from EDC. The data were combined into one raster grid using Arc/Info GIS software. Land cover data within the boundary of the Frederick 30 X 60 minute quadrangle were extracted from the larger grid for inclusion in this Open-File Report. The resultant grid was reprojected from the Albers Conical Equal Area projection to the Universal Transverse Mercator System and to the Geographic Reference System.
    Date: 2002 (process 3 of 3)
    Hydrography, hypsography, political boundaries, and roads Digital Line Graph (DLG) layers were obtained from EDC for the Frederick 30 X 60 minute quadrangle. The roads layer was filtered to contain only major highways. The layers were reprojected from the Universal Transverse Mercator System to the Geographic Reference System.
  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?
    Version 1.0 - subsequent versions may contain more data and/or a greater diversity of data types.
  5. How consistent are the relationships among the observations, including topology?
    Polygon and chain-node topology present

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:
Although all data released in this report have been used by the 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.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey
    Scott Southworth
    National Center, MS926A
    Reston, Virginia
    USA

    703-648-6385 (voice)
    703-648-6953 (FAX)
    ssouthwo@usgs.gov
    Hours_of_Service: Monday - Friday 9:00 - 5:00 EST
  2. What's the catalog number I need to order this data set? USGS Open-File Report 02-437
  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, make any warranty, expressed or implied, or assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product or process disclosed in this report, and 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 related 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.
  4. How can I download or order the data?
    • Availability in digital form:
      Data format: Bedrock and surficial geologic map units, geologic cross sections, faults, structural geology, political boundaries, elevation contours, hydrology and major highways. in format ARCE (version 8.1.2) Size: 35
      Network links: http://pubs.usgs.gov/of/2002/of02-437/data/of02437_gz.tar.gz
    • Cost to order the data: none


Who wrote the metadata?

Dates:
Last modified: 13-Jun-2016
Metadata author:
U.S. Geological Survey
Scott Southworth
National Center, MS926A
Reston, Virginia
USA

703-648-6385 (voice)
703-648-6953 (FAX)
ssouthwo@usgs.gov
Hours_of_Service: Monday - Friday 9:00 - 5:00 EST
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

This page is <https://geo-nsdi.er.usgs.gov/metadata/open-file/02-437/metadata.faq.html>
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