Identification_Information:
  Citation:
    Citation_Information:
      Originator: Maryland Geological Survey
      Publication_Date: Unpublished Material
      Title: Contacts
      Geospatial_Data_Presentation_Form: vector digital data
  Description:
    Abstract: Contains representation class for geologic contact line symbols from Section 1 of FGDC Digital Cartographic Standard for Geologic Map Symbolization (FGDC Document Number FGDC-STD-013-2006).
    Purpose: To create separate, editable contact lines between geologic units
  Time_Period_of_Content:
    Time_Period_Information:
      Range_of_Dates/Times:
        Beginning_Date: 2010
        Beginning_Time: unknown
        Ending_Date: 2011
        Ending_Time: unknown
    Currentness_Reference: ground condition
  Status:
    Progress: Complete
    Maintenance_and_Update_Frequency: As needed
  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate: -77.875934
      East_Bounding_Coordinate: -77.749836
      North_Bounding_Coordinate: 39.722755
      South_Bounding_Coordinate: 39.624162
  Keywords:
    Theme:
      Theme_Keyword_Thesaurus: none
      Theme_Keyword: contacts, bedrock contacts
    Place:
      Place_Keyword_Thesaurus: none
      Place_Keyword: Mason and Dixon quadrangle, Hagerstown Valley, Maryland
  Access_Constraints: None
  Use_Constraints: These data represent the results of data collection/processing for a specific Department of Natural Resources, Maryland Geological Survey activity and indicate general existing conditions.  As such, they are only valid for the intended use, content, time, and accuracy specification.  The user is responsible for the results of any application of the data for other than their intended purpose.  The Department of Natural Resources, Maryland Geological Survey makes no warranty, expressed or implied, as to the use or appropriateness of the data, and there are no warranties of merchantability or fitness for a particular purpose of use.  The Maryland Geological Survey makes no representation to the accuracy or completeness of the data and may not be held liable for human error or defect.  Data are only valid at 1:24,000 scale.  Data should not be used at a scale greater than that.  By using the data, you signify that you have read the use constraints and accept its terms.  Acknowledgement of the Maryland Geological Survey and credit to the originator(s)/author(s) are expected in products derived from this data.
  Point_of_Contact:
    Contact_Information:
      Contact_Person_Primary:
        Contact_Person: R. D.Conkwright
        Contact_Organization: Maryland Geological Survey
      Contact_Position: Geologist
      Contact_Address:
        Address_Type: mailing and physical address
        Address: 2300 St. Paul St.
        City: Baltimore
        State_or_Province: MD
        Postal_Code: 21218
        Country: USA
      Contact_Voice_Telephone: 410 554-5545
      Contact_Electronic_Mail_Address: bconkwright@dnr.state.md.us
      Hours_of_Service: 8:00am-4:30pm EST
  Data_Set_Credit: Maryland Geological Survey
  Native_Data_Set_Environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.4000
Data_Quality_Information:
  Attribute_Accuracy:
    Attribute_Accuracy_Report: The geologic map was hand drawn on stable-base film (e.g., Mylar or Herculene) at a scale of 1:24,000 by the principal geologist based on standard geologic mapping techniques, which involves the integration and interpretation of field observations and available subsurface data (e.g., drilling logs, geophysical logs). The hand-drawn map includes geologic contact lines and coded labels for the geologic map units.  Digital attributes were assigned during the creation of the geology layer in ArcInfo.  Each polygon has a unit label attribute designating the mapped geologic unit provided by the principal geologist or MGS GIS project coordinator/editor.  Additional polygon attributes for the digital files were provided by the MGS GIS project coordinator.  Feature attributes were then verified visually in the ArcInfo attribute tables; attributes linked to map layout components were verified visually on the map both in print and symbolized display on-screen.  Maryland Geological Survey performs quality assurance on the digital vector file by comparison of the digital data files and map to the original films. Selected attributes that cannot be visually verified on plots or on screen are interactively queried and verified on screen by the GIS project coordinator and GIS specialist(s).
  Logical_Consistency_Report: Map elements were visually checked for missing and duplicate features and feature attributes and other errors by the map author(s), GIS project coordinator and GIS specialist(s) who created the digital database. Hard copy prints of the map were reviewed by the MGS geologists for consistency with basic geologic principles and general conformity to mapping standards. The graphic data has been tested for consistency through the application of ArcGIS topologic testing.  Polylines were tested to a 0.001 tolerance for overlap or gaps between line features and adjacent geologic formation polygons.
  Completeness_Report: Updates may occur as needed or as additional data become available. Check MGS website for version number or contact MGS Publications Office (see Distribution_Information).  Data are complete based on compilation at 1:24,000 scale.
  Positional_Accuracy:
    Horizontal_Positional_Accuracy:
      Horizontal_Positional_Accuracy_Report: Horizontal accuracy of the digital vector file was tested by comparing proof plots with original mylar(s) of the map prepared by the principal geologist(s) at a scale of 1:24000. The comparison was done visually by MGS geologists and the GIS team.  Some corrections/adjustments to contact locations were made per instruction of the principal geologist, directly in the digital form.  The difference in the positional accuracy between the geologic unit contacts as drawn and digitized and the contacts in the field is difficult to quantify in geologic mapping of this type.  Where a contact between two bedrock units is concealed by a mappable thickness of overlying Quaternary materials (e.g., alluvium, colluvium, residuum, terrace deposits or artificial fill) the location is an estimate indicated by a dotted line on the map (attributed as "concealed" in the arc attribute table in coverage).  Where a bedrock contact is not concealed by mappable Quaternary deposits, the certainty of a contact's location may vary because many bedrock contacts are not exposed everywhere (they are often covered by soils and/or vegetation in places).  In these situations the location certainty/accuracy of geologic contacts has been designated by the principal geologist as accurate (symbolized by a solid line), approximate (a long dash pattern), or inferred (a short dash pattern).
  Lineage:
    Source_Information:
      Source_Scale_Denominator: 24000
      Type_of_Source_Media: stable-base material
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Range_of_Dates/Times:
            Beginning_Date: 2011
            Beginning_Time: unknown
            Ending_Date: 2013
            Ending_Time: unknown
        Source_Currentness_Reference: ground condition
      Source_Citation_Abbreviation: Hagerstown quadrangle geologic map, drafted mylars (Brezinski, unpublished)
      Source_Contribution: The geology was drafted by David K. Brezinski from field mapping of the Hagerstown quadrangle
    Process_Step:
      Process_Description:
        Field measurements and observations of geologic structural features were recorded by David Brezinski.  These data along with other geologic field records were compiled onto a base topographic map (USGS 7.5-minute 1:24,000 topographic series).  The final geologic compilation was drawn by David Brezinski on a stable-base material (Mylar), using the USGS 0.007-inch-thick film positive 

        of the corresponding 7.5-minute topographic map as an underlying stable base.  Spatial reference points were added to the geology mylar for georeferencing purposes.
      Process_Date: Unknown
    Process_Step:
      Process_Description: The base-stable Mylar map was scanned at a commercial scanning facility at 300 DPI and saved as a TIF format image.
      Process_Date: Unknown
    Process_Step:
      Process_Description:
        The scanned TIFF image was brought into ESRI ArcMap software and georeferenced (or registered and rectified) to the Maryland State Plane Coordinate System (North American Datum (NAD) 1983 US meters).  The above-mentioned spatial reference points were used as linking points.  When rectifying, nearest neighbor interpolation at a polynomial of 1 was used and attempts were 

        made to achieve the lowest root mean square (RMS) error possible, which for the structural point layer was approximately 0.0002.  NOTE: this RMS error is reported in geospatial units of the projection, which at this point are feet.  (RMS error is not reported in digitizer inches or physical map inches or millimeters.)
      Process_Date: Unknown
    Process_Step:
      Process_Description: Geologic contacts on scanned image were digitized on-screen at a scale of 1:5000 or greater using ArcGIS Desktop's ArcScan utility in manual mode.  Accuracy attributes were assigned at the time digitizing was done
      Process_Date: Unknown
    Process_Step:
      Process_Description: Topology was constructed for contacts to detect any logical errors.  Errors were corrected.
      Source_Used_Citation_Abbreviation: ESRI documentation
      Process_Date: Unknown
Spatial_Data_Organization_Information:
  Direct_Spatial_Reference_Method: Vector
  Point_and_Vector_Object_Information:
    SDTS_Terms_Description:
      SDTS_Point_and_Vector_Object_Type: String
      Point_and_Vector_Object_Count: 146
Spatial_Reference_Information:
  Horizontal_Coordinate_System_Definition:
    Planar:
      Grid_Coordinate_System:
        Grid_Coordinate_System_Name: State Plane Coordinate System
        State_Plane_Coordinate_System:
          SPCS_Zone_Identifier: 1900
          Lambert_Conformal_Conic:
            Standard_Parallel: 38.300000
            Standard_Parallel: 39.450000
            Longitude_of_Central_Meridian: -77.000000
            Latitude_of_Projection_Origin: 37.666667
            False_Easting: 400000.000000
            False_Northing: 0.000000
      Planar_Coordinate_Information:
        Planar_Coordinate_Encoding_Method: coordinate pair
        Coordinate_Representation:
          Abscissa_Resolution: 0.000100
          Ordinate_Resolution: 0.000100
        Planar_Distance_Units: meters
    Geodetic_Model:
      Horizontal_Datum_Name: North American Datum of 1983
      Ellipsoid_Name: Geodetic Reference System 80
      Semi-major_Axis: 6378137.000000
      Denominator_of_Flattening_Ratio: 298.257222
  Vertical_Coordinate_System_Definition:
    Altitude_System_Definition:
      Altitude_Resolution: 0.000010
      Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates
Entity_and_Attribute_Information:
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: Contacts
      Entity_Type_Definition: A contact is a planar surface that bounds a geologic unit (except where that bounding surface is a fault). A contact is intrinsic to the genesis of each geologic unit; that is the contact delineates the stratigraphic position where, owing to changing environmental conditions or other genetic factors at the time of origin, the properties and characteristics of one geologic unit change, either abruptly or gradually, to those of another geologic unit. Discussion of contacts in this standard primarily pertains to those that have been mapped in the field (for example, contacts that bound formations, members, beds, lava flows, or intrusions). Contacts can also exist between higher rank units, although these contacts typically are not mapped in the field; instead, they are concepts that may arise later when lower rank stratigraphic units are combined into higher rank stratigraphic units (see discussion of lithostratigraphic boundaries by the North American Commission on Stratigraphic Nomenclature, 1983, p. 856–58). Contacts can be classified as one of a number of types, depending on the nature or origin of the contact and the geologic units that it separates. Examples of such contact types include the following: sedimentary (conformable; unconformable, etc.); alluvial; landslide; residual; igneous (intrusive, extrusive, pyroclastic); metamorphic; and high-strain (cataclastic, mylonitic, tectonic). If available, supplemental information about a contact's type is added as a feature attribute to the geologic map database; however, specialized line symbols usually are not used to represent these various contact types. In general, unless otherwise stated on the geologic map or in the geologic map database, contacts should be considered generic; that is, they have no particular type or identity.
      Entity_Type_Definition_Source: Federal Geographic Data Committee FGDC Document Number FGDC-STD-013-2006 (FGDC Digital Cartographic Standard for Geologic Map Symbolization)
    Attribute:
      Attribute_Label: OBJECTID
      Attribute_Definition: Internal feature number.
      Attribute_Definition_Source: ESRI
      Attribute_Domain_Values:
        Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated.
    Attribute:
      Attribute_Label: Shape
      Attribute_Definition: Feature geometry.
      Attribute_Definition_Source: ESRI
      Attribute_Domain_Values:
        Unrepresentable_Domain: Coordinates defining the features.
    Attribute:
      Attribute_Label: Imp_FType
      Attribute_Definition: not used
    Attribute:
      Attribute_Label: Label
      Attribute_Definition: not used
    Attribute:
      Attribute_Label: LocationConfidenceMeters
      Attribute_Definition: not used
    Attribute:
      Attribute_Label: ExConf
      Attribute_Definition: not used
    Attribute:
      Attribute_Label: IDConf
      Attribute_Definition: not used
    Attribute:
      Attribute_Label: LocationMethod
      Attribute_Definition: not used
    Attribute:
      Attribute_Label: DataSources_ID
      Attribute_Definition: not used
    Attribute:
      Attribute_Label: Notes
      Attribute_Definition: General comments about geologic contacts, as needed
      Attribute_Definition_Source: none
    Attribute:
      Attribute_Label: RuleID
      Attribute_Definition: Rule code for assigning ArcGIS map symbology
      Attribute_Definition_Source: Federal Geographic Data Committee FGDC Document Number FGDC-STD-013-2006 (FGDC Digital Cartographic Standard for Geologic Map Symbolization)
      Beginning_Date_of_Attribute_Values: 2013
    Attribute:
      Attribute_Label: Override
      Attribute_Definition: Override code for ArcGIS map symbolization exceptions to RuleID codes
      Attribute_Definition_Source: ESRI documentation
    Attribute:
      Attribute_Label: FGDCRefNo
      Attribute_Definition: Contact entity reference number, FGDC section 1.  Refers to certainty of identity, existence and location.
      Attribute_Definition_Source: Federal Geographic Data Committee FGDC Document Number FGDC-STD-013-2006 (FGDC Digital Cartographic Standard for Geologic Map Symbolization)
      Attribute_Domain_Values:
        Enumerated_Domain:
          Enumerated_Domain_Value: <NULL>
          Enumerated_Domain_Value_Definition: Line entity is not a contact but was created to complete map edged, or is overlain by a fault.  Refer to Notes attribute for explanation.
          Enumerated_Domain_Value_Definition_Source: Maryland Geological Survey
        Enumerated_Domain:
          Enumerated_Domain_Value: 1.1.3
          Enumerated_Domain_Value_Definition: Contact - Identity and existence certain, location approximate
          Enumerated_Domain_Value_Definition_Source: Federal Geographic Data Committee FGDC Document Number FGDC-STD-013-2006 (FGDC Digital Cartographic Standard for Geologic Map Symbolization)
        Enumerated_Domain:
          Enumerated_Domain_Value: 1.1.7
          Enumerated_Domain_Value_Definition: Contact - Identity and existence certain, location concealed.  Usually concealed by surface deposits or water bodies.
          Enumerated_Domain_Value_Definition_Source: Federal Geographic Data Committee FGDC Document Number FGDC-STD-013-2006 (FGDC Digital Cartographic Standard for Geologic Map Symbolization)
      Beginning_Date_of_Attribute_Values: 2013
      Attribute_Measurement_Frequency: As needed
    Attribute:
      Attribute_Label: FGDCDesc
      Attribute_Definition: not used
    Attribute:
      Attribute_Label: FC_ID
      Attribute_Definition: FGDC standard ID for map entities
      Attribute_Definition_Source: Federal Geographic Data Committee FGDC Document Number FGDC-STD-013-2006 (FGDC Digital Cartographic Standard for Geologic Map Symbolization)
      Attribute_Domain_Values:
        Codeset_Domain:
          Codeset_Name: FGDC ID, Section1, Contacts, Key Beds and Dikes
          Codeset_Source: Federal Geographic Data Committee FGDC Document Number FGDC-STD-013-2006 (FGDC Digital Cartographic Standard for Geologic Map Symbolization)
    Attribute:
      Attribute_Label: Shape_Length
      Attribute_Definition: Length of feature in internal units.
      Attribute_Definition_Source: ESRI
      Attribute_Domain_Values:
        Unrepresentable_Domain: Positive real numbers that are automatically generated.
  Overview_Description:
    Entity_and_Attribute_Overview: The main attribute of the contact attribute is the certainty of identification and location.  Most geologic contacts are concealed by surface deposits, soil, water bodies, construction, etc.  While the contact existence is reasonably assured, the location is most often approximated or concealed.
    Entity_and_Attribute_Detail_Citation: Federal Geographic Data Committee FGDC Document Number FGDC-STD-013-2006 (FGDC Digital Cartographic Standard for Geologic Map Symbolization).  Appendix A, Contact Section 1
Distribution_Information:
  Distributor:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: Maryland Geological Survey
        Contact_Person: Robert D. Conkwright
      Contact_Position: Geologist
      Contact_Address:
        Address_Type: mailing and physical address
        Address: 2300 St. Paul St.
        City: Baltimore
        State_or_Province: MD
        Postal_Code: 21218
        Country: USA
      Contact_Voice_Telephone: 410 554-5545
      Contact_Electronic_Mail_Address: bconkwright@dnr.state.md.us
  Resource_Description: Downloadable Data
  Distribution_Liability:
    Where data have been translated from one format to another or initially developed from maps or other sources, reasonable effort has been made to preserve the data quality as originally developed, however, no warranty expressed or implied is made by the Maryland Geological Survey as to the completeness or accuracy of these data and related materials.
        Although all data and software published have been used by the Maryland Geological Survey of the Maryland Department of Natural Resources, no warranty, expressed or implied, is made by that agency as to the accuracy of the data and the related materials and/or the functioning software.  The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the Maryland Geological Survey (or Department of Natural Resources) in the use of these data, software or related materials.
        The Department of Natural Resources shall not be subject to liability for human error, error due to software conversion, defect, or failure of machines, or any material used in the connection with the machines, including tapes, disks, CD-ROMs or DVD-ROMs and energy.  The Maryland Department of Natural Resources shall not be liable for any lost profits, consequential damages, or claims against the Department of Natural Resources by third parties.  The liability of the Department of Natural Resources for damage, regardless of the form of the action, shall not exceed any distribution fees that may have been paid in obtaining spatial data.
  Standard_Order_Process:
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: geodatabase
        Format_Version_Number: ESRI ArcGIS Desktop 9.3.1
      Digital_Transfer_Option:
        Online_Option:
          Computer_Contact_Information:
            Network_Address:
              Network_Resource_Name: http:\\www.mgs.md.gov
    Fees: none
  Custom_Order_Process: Contact Maryland Geological Survey
  Technical_Prerequisites: ESRI ArcGIS Desktop 9.3.1 is required to use this feature class
Metadata_Reference_Information:
  Metadata_Date: 20130807
  Metadata_Review_Date: 20130730
  Metadata_Contact:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: Maryland Geological Survey
        Contact_Person: Robert D. Conkwright
      Contact_Position: Geologist
      Contact_Address:
        Address_Type: REQUIRED: The mailing and/or physical address for the organization or individual.
        City: REQUIRED: The city of the address.
        State_or_Province: REQUIRED: The state or province of the address.
        Postal_Code: REQUIRED: The ZIP or other postal code of the address.
      Contact_Voice_Telephone: 410 554-5545
      Contact_Electronic_Mail_Address: bconkwright@dnr.state.md.us
      Hours_of_Service: 8:00am - 4:30pm, EST
  Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
  Metadata_Standard_Version: FGDC-STD-001-1998
  Metadata_Time_Convention: local time
  Metadata_Access_Constraints: none
  Metadata_Use_Constraints: The metadata must always accompany this data set. The metadata may never be edited or removed from its association with the data set. Only staff from the Maryland Geological Survey may modify the metadata of this data set.  (Derivative geospatial data should have separate metadata with proper citation and reference to this data set.)
  Metadata_Extensions:
    Online_Linkage: http://www.esri.com/metadata/esriprof80.html
    Profile_Name: ESRI Metadata Profile
