Metadata: Identification_Information: Citation: Citation_Information: Originator: Susan J. Tewalt Publication_Date: 2000 Title: Structure contours (elevation) of Fire Clay coal zone in Virginia, Kentucky, and West Virginia Larger_Work_Citation: Citation_Information: Originator: Northern and Central Appalachian Basin Coal Regions Assessment Team Publication_Date: 2000 Title: 2000 Resource Assessment of Selected Coal Beds and Zones in the Northern and Central Appalachian Basin Coal Regions Series_Information: Series_Name: U.S. Geological Survey Professional Paper Issue_Identification: PP1625-C Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: http://greenwood.cr.usgs.gov/pub/ppapers/p1625c/ Description: Abstract: This dataset represents the structure contours (elevation) of the Fire Clay coal zone in Virginia, West Virginia, and Kentucky. The coal zone is also known by other names, depending upon locale. The cover was created by gridding 22,468 elevation points. Many points originated from digital structure contour lines obtained from Kentucky and West Virgina. In Virginia, data were searched from the StratiFact database created from the National Coal Resource Data System (NCRDS). Data from specific quadrangles in the StratiFact database from the West Virginia Geological and Economic Survey were also searched. The grid was created in EarthVision, was contoured in 100-ft intervals and imported to ARC/INFO as polygons using an AML. State line discrepancies were expected and rectified. Offsets existed because State contours were created from more local, not regional data sets. The data from the West Virginia Geological and Economic Survey are not final in nature, as correlation of the beds in this stratigraphic sequence is ongoing. Thus the nature of this coverage is necessarily provisional. Introduction: This map is one of many Geographic Information System (GIS) products of the National Coal Assessment that is being conducted by the U.S. Geological Survey in cooperation with State geological surveys and other Federal and State agencies. The Middle Pennsylvanian Pottsville Group Fire Clay coal is an important resource in the Central Appalachian Basin coal region and has been mined for the last one hundred years. The Fire Clay coal is most commonly referred to as the Fire Clay (Hazard No. 4) in Kentucky, the Phillips in Virginia, and the Fire Clay in West Virginia. This resource model for the Fire Clay coal zone must be considered provisional, because the correlation of the zone continues to be evaluated in West Virginia. Purpose: The purpose of Professional Paper 1625 is to release the interpretation of assessment and modeling data for the the top-producing coal beds in the northern and central Appalachian Basin coal regions. The purpose of this cover was to determine overburden thickness for classifying resources in this study. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2000 Currentness_Reference: data collection and collation period Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -84.114 East_Bounding_Coordinate: -81.533 North_Bounding_Coordinate: 38.099 South_Bounding_Coordinate: 36.599 Keywords: Theme: Theme_Keyword_Thesaurus: Coal Resource Classification of the U.S. Geological Survey, USGS circular 891. Theme_Keyword: Eastern Energy Team Theme_Keyword: energy Theme_Keyword: power Theme_Keyword: resources Theme_Keyword: coal Theme_Keyword: coal resources Theme_Keyword: coal extent Theme_Keyword: bituminous Theme_Keyword: structure Theme_Keyword: elevation Theme_Keyword: outcrop Theme_Keyword: USGS Theme_Keyword: Kentucky Geological Survey (KGS) Theme_Keyword: West Virginia Geological and Economic Survey (WVGES) Theme_Keyword: Virginia Division of Mineral Resources (VDMR) Theme_Keyword: Virginia Department of Mines, Minerals and Resources Place: Place_Keyword_Thesaurus: Geographic Names Information System Place_Keyword: United States Place_Keyword: Kentucky Place_Keyword: West Virginia Place_Keyword: Virginia Place_Keyword: Appalachians Place_Keyword: BELL County Place_Keyword: BOONE County Place_Keyword: BREATHITT County Place_Keyword: CLAY County Place_Keyword: FLOYD County Place_Keyword: HARLAN County Place_Keyword: JOHNSON County Place_Keyword: KNOTT County Place_Keyword: KNOX County Place_Keyword: LESLIE County Place_Keyword: LEE County Place_Keyword: LETCHER County Place_Keyword: LOGAN County Place_Keyword: MAGOFFIN County Place_Keyword: MARTIN County Place_Keyword: MORGAN County Place_Keyword: PERRY County Place_Keyword: PIKE County Place_Keyword: WHITLEY County Place_Keyword: WISE County Stratum: Stratum_Keyword_Thesaurus: Geologic Names Unit Lexicon (GNULEX), 1996; Stratigraphic Nomenclature Databases for the United States, It's Possessions, and Territories, U.S. Geological Survey Digital Data Series DDS-6, release 3. Stratum_Keyword: Pennsylvanian Stratum_Keyword: Middle Pennsylvanian Stratum_Keyword: Pikeville Formation Stratum_Keyword: Kanawha Formation Stratum_Keyword: Wise Formation Stratum_Keyword: Pottsville Group Stratum_Keyword: Breathitt Group Stratum_Keyword: Fire Clay Coal Stratum_Keyword: Phillips Coal Stratum_Keyword: Hazard No. 4 Coal Access_Constraints: None Use_Constraints: To be used for regional analysis only. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Susan J. Tewalt (compiler) Contact_Organization: U.S. Geological Survey, Eastern Energy Resources Team Contact_Address: Address_Type: mailing address Address: MS 956 National Center City: Reston State_or_Province: Virginia Postal_Code: 20192 Country: USA Contact_Voice_Telephone: 703-648-6437 Data_Set_Credit: State geological surveys maintain the most recent coal maps and have provided the USGS with the data necessary to complete the assessment. Primary contacts at the State surveys for this product include: KY- G. Weisenfluh, WV- B.M. Blake, VA- R. Sites. It is recommended that new data be obtained from the State geological surveys that are the sources of the information used in this study. Kentucky information can be found online at: http://www.uky.edu/KGS/home.htm. Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Deductive_Estimate: The range of the input data was from 300 to 3340 feet, with a mean of 1402 ft and a standard deviation of 564 ft. The grid from which these contours were obtained had a mean of 1919 ft and a standard deviation of 1006, with an average z error of 0.5 ft. In areas of sparse data, the coverages will not reflect ground truth. The higher elevations for the grid are attributed to a large extent to a structural high to the southeast, which in reality is greatly limited by actual outcrop extent, but appears in the grid and raises the grid's mean elevation. Logical_Consistency_Report: This data set does not contain dangles or redundant arcs. Completeness_Report: The input data to this coverage will be more complete in the future and possibly revised in the State of West Virginia. The source maps are believed to be the most up to date at the time of collection. State agencies reviewed the data set for completeness. The State of Tennessee is not included in this coverage. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Locations of the input points used to create this cover are estimated to be accurately located within 1/4 mile. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: The raw input data represent elevation measurements that are believed to be accurate within 50 feet. The elevations represent a calculation- subtraction of the depth of the Fire Clay coal from the surface (topographic elevation) of the drillhole. Surface elevations of the drillholes in the database were not compared to any paper or digital reference. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Virginia Division of Mineral Resources Publication_Date: 1998 Title: StratiFact database generated from National Coal Resources Data System database Source_Scale_Denominator: 24000 Type_Of_Source_Media: online Source_Time_Period_Of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1998 Source_Currentness_Reference: Publication Date Source_Citation_Abbreviation: VA-1 Source_Contribution: Data searched from NCRDS for Virginia were the entire basis for structure of Fire Clay coal zone in Virginia. Source_Information: Source_Citation: Citation_Information: Originator: Kentucky Geological Survey Publication_Date: 1997 Title: fcl_cont.e00; export Arc/Info cover of structure for Fire Clay Source_Scale_Denominator: 100000 Type_Of_Source_Media: online Source_Time_Period_Of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1997 Source_Currentness_Reference: Publication Date Source_Citation_Abbreviation: KY-1 Source_Contribution: This file was total source for structure contours (digitized from manually drawn contours) for the Fire Clay coal zone in Kentucky. Source_Information: Source_Citation: Citation_Information: Originator: West Virginia Geological and Economic Survey Publication_Date: 1998 Title: Structure contour lines for the Fire Clay coal by 7.5 minute quadrangle. Source_Scale_Denominator: 24000 Type_Of_Source_Media: paper Source_Time_Period_Of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1980 - 1986 Source_Currentness_Reference: Publication Date Source_Citation_Abbreviation: WV-1 Source_Contribution: Contour lines drawn on topographic quads were digitized; these files were the primary source for West Virginia structure. The quads included the following: Arnett, Beckwith, Dorothy, Eskdale, Matheny, Pax, Pilot Knob, Powellton, Whitesville, Barnabus, Chapmanville, Delbarton, Holden, Majestic, Matewan, Myrtle, Naugatuck, Williamson, Amherstdale, Clothier, Henlawson, Logan, Lorado, Mallory, Man, Oceana, Wharton, Belle, Cedar Grove, Gauley Bridge, Julian, Madison, Montgomery, Racine, Sylvester and Williams Mountain. Source_Information: Source_Citation: Citation_Information: Originator: West Virginia Geological and Economic Survey Publication_Date: 1998 Title: WVGES StratiFact database for Fire Clay coal. Source_Scale_Denominator: 24000 Type_Of_Source_Media: online Source_Time_Period_Of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1980 - 1986 Source_Currentness_Reference: Publication Date Source_Citation_Abbreviation: WV-2 Source_Contribution: This database provided elevation data for 7.5' quadrangles that were not covered by the digitized file. Process_Step: Process_Description: 1. All appropriate KCRIS elevation data were posted by KGS personnel on 1:100,000-scale base maps. For areas with inadequate control points that were proximal to the outcrop, additional points were collected from the geologic quadrangle maps. For areas with inadequate control points and the coal bed was below drainage, contours were estimated from the trend of structure contours of overlying beds and estimates of interburden distance. 2. Plotted point data were hand contoured with an interval of 100 ft. These vectors, as well as those interpolated from overlying beds were digitized in ARC/INFO, and encoded according to contour level to create data source KY-1. Contributions by : E. Thacker and J. Esterle. Process_Date: 1998 Process_Step: Process_Description: NCRDS data downloaded for Virginia. Fire Clay (Phillips coal in Virginia) data were checked against original records for the Appalachia 7.5' quad (which had been verified and correlated by VDMR). Correlations for the Fire Clay were made by USGS for holes with unlabeled beds in the remainder of the Virginia dataset. Process_Date: 1998 Process_Step: Process_Description: All maps (WV-1) were manually digitized on a tablet using ARC/INFO. Arcs were created through manual labelling and editing in order to create topology. Process_Date: 1998 Process_Step: Process_Description: Existing ARC/INFO coverage of structure contour lines obtained from Kentucky and West Virginia geological surveys on the Fire Clay coal bed were converted to points (using arcpoint) with a 250 meter weed tolerance and the elevation attribute. Process_Date: 1999 Process_Step: Process_Description: Fire Clay elevations were searched from the Virginia database (VA-1) and merged with data searched from the West Virginia StratiFact database (WV-2). Points in West Virginia that overlapped with source WV-1 were deleted in EarthVision using the graphic editor. The resulting data were projected to Albers coordinates from geographic coordinates and were appended to the points file culled from digitized lines (previous process step), then input to EarthVision as a new scattered data file. Process_Date: 1999 Process_Step: Process_Description: Data were gridded using 300 meter cell size, minimum tension algorithm, extrapolation, exact z range, 4 neighboring point search, and a vertical faults file. Grid was contoured and examined. The input point file was modified by deleting points along State and some county lines within States in order to rectify offsets of the lines. The final grid was contoured using 100-foot intervals and made into an ASCII file. Process_Date: 1999 Process_Step: Process_Description: ASCII contour lines imported to ARC/INFO as polygons using ARC AML from Illinois State Geological Survey, clipping with a simple polygon and using the fault file used in the gridding step. Process_Date: 1999 Process_Step: Process_Description: File was manually edited to fix polygons with no labels and erroneous labels. Process_Date: 1999 Process_Step: Process_Description: Structure coverage was clipped to resource assessment areas and updated with internal no-coal areas. Process_Date: 1999 Process_Step: Process_Description: This dataset was edited to resolve inconsistencies and to incorporate revisions. Polygon topology was built and attributed using the codes described within this document. Process_Date: 1999 Process_Step: Process_Description: Projected to geographic coordinates. Process_Date: 1999 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information SDTS_Terms_Description SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains Point_and_Vector_Object_Count: 3803 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.0001 Longitude_Resolution: 0.0001 Geographic_Coordinate_Units: Decimal Degrees Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.4 Denominator_of_Flattening_Ratio: 294.98 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: c9125st.pat Entity_Type_Definition: polygon attribute table for C9125ST coverage Entity_Type_Definition_Source: ARC/INFO Attribute: Attribute_Label: elev_st Attribute_Definition: Coal elevation value halfway between bounding contour lines. Values of -999 represent internal no-coal areas. Attribute_Definition_Source: this study Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 450 Range_Domain_Maximum: 3350 Attribute_units_of_measure: feet Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 50 Attribute_Value_Accuracy_Explanation: half of one contour interval Entity_Type: Entity_Type_Label: c9125st.aat Entity_Type_Definition: arc attribute table for C9125ST coverage Entity_Type_Definition_Source: ARC/INFO Attribute: Attribute_Label: elev_st Attribute_Definition: Coal elevation value. Values of 0 represent outcrop clipping arcs or fault line traces. Attribute_Definition_Source: this study Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 3300 Attribute_units_of_measure: feet Attribute_Value_Accuracy_Information: Attribute_Value_Accuracy: 50 Attribute_Value_Accuracy_Explanation: half of one contour interval Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Susan J. Tewalt Contact_Organization: U.S. Geological Survey, Eastern Energy Resources Team Contact_Address: Address_Type: mailing address Address: MS 956 National Center City: Reston State_or_Province: Virginia Postal_Code: 20192 Country: USA Contact_Voice_Telephone: 703-648-6437 Resource_Description: USGS Professional Paper 1625-C: Chapter F; c9125st.e00 Distribution_Liability: Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although these data 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. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data, software, or related materials. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ARCE Format_Version_Number: 7.2.1 Format_Information_Content: Polygonal structure contour coverage Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://greenwood.cr.usgs.gov/pub/ppapers/p1625c/ Fees: none Metadata_Reference_Information: Metadata_Date: 20000404 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Susan J. Tewalt (compiler) Contact_Organization: U.S.Geological Survey, Eastern Energy Resources Team Contact_Address: Address_Type: mailing address Address: MS 956 National Center City: Reston State_or_Province: Virginia Postal_Code: 20192 Country: USA Contact_Voice_Telephone: 703-648-6437 Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998