Identification_Information: Citation: Citation_Information: Originator: USGS Central Region Energy Resources Team Publication_Date: 19990930 Title: Knxsec.shp (Knoblach cross-section lines) Publication_Information: Publication_Place: Denver, CO Publisher: USGS Central Region Energy Resources Team Description: Abstract: This Arcview shape file is composed of two arcs, each representing the location of subsurface cross-sections in the Ashland coalfield, Montana. These arcs are linked to graphic files displaying subsurface correlations of the Knobloch coal resource unit and associated coal beds in the coalfield. This theme was created specifically for the National Coal Resources Assessment in the Northern Rocky Mountains and Great Plains Region. Purpose: The Nation's coal resources are being assessed by the USGS. This assessment identifies and characterizes the coal beds and coal zones that will provide the bulk of the Nation's coal-derived energy during the next few decades. This assessment is different from previous USGS assessments because digital files and databases are being collected and stored in standardized formats,and being analyzed using a Geographic Information System (GIS). Supplemental_Information: The cross section theme is a digital line (arc) coverage showing the location of subsurface cross sections A-A', and B-B' in the Ashland coal field. Each line in the ARCVIEW theme is linked to a PDF graphic file displaying the stratigraphic cross section. The two cross sections were derived from drill hole data, and both show interpretations of Knobloch coal resource unit continuity within the Ashland coal field. The cross sections are constructed from natural-gamma (NG) and more limited spontaneous potential (SP) and resistivity (RES) geophysical log profiles. The majority of the natural-gamma logs are products of coal exploration drilling, whereas the spontaneous potential and resistivity logs are from oil and gas test wells. The datum is mean sea level for both cross sections, and the horizontal distribution of drill hole control points along each line of section is scaled to reflect the relative map distance between drill holes, although this horizontal scaling is approximate. The log profiles used in the cross sections were constructed from reduced geophysical logs. Where natural-gamma logs were used, a "mirrored" image of the log profile is displayed on the cross section to highlight the natural-gamma response in coal beds. Spontaneous potential and resistivity logs are displayed in tandem as is typical of these geophysical log records in oil and gas exploration. In this area, coal beds are characterized by low natural-gamma and high resistivity responses. Spontaneous potential logs were used primarily for differentiating high resistivity responses in sandstone from similar high resistivity responses characteristic in coal beds. Coal-bed names in strata above and below the Knobloch coal resource unit are based on drill hole data of W.C. Culbertson and L.R.H. Biewick in the U.S. Geological Survey National Coal Resources Data System. North-south cross section A-A' traverses about 30 miles of the Ashland coal field, while northwest-southeast cross section B-B' covers approximately 22 miles of the coal field. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 19990000 Currentness_Reference: Publication Date Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -106.2430 East_Bounding_Coordinate: -105.8595 North_Bounding_Coordinate: 45.6176 South_Bounding_Coordinate: 45.2070 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Cross-sections Theme_Keyword: Geophysical Log Profiles Theme_Keyword: Stratigraphy Theme_Keyword: Knobloch Coal Resource Unit Place: Place_Keyword_Thesaurus: None Place_Keyword: Ashland coalfield Place_Keyword: Montana Place_Keyword: Rosebud County Place_Keyword: Powder River County Place_Keyword: Powder River Basin Place_Keyword: Northern Rocky Mountain and Great Plains Fort Union Coal Resources Assessment Access_Constraints: None Use_Constraints: None Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: USGS Central Region Energy Resources Team Contact_Person: Steve Roberts Contact_Position: Geologist Contact_Address: Address_Type: mailing address Address: Box 25046 MS 939 Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303.236.7788 Contact_Electronic_Mail_Address: sroberts@usgs.gov Native_Data_Set_Environment: ArcView version 3.0 ARC/INFO 7.1.2 SUNOS 5.6 Sun4U UNIX Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: No tests were performed Logical_Consistency_Report: Line features present Completeness_Report: Cross section are limited to the Knobloch coal resource unit in the Ashland coalfield. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Limited to software coordinate precision of geographic coordinates Lineage: Source_Information: Source_Citation: Citation_Information: Originator: USGS Publication_Date: Unknown Publication_Time: Unknown Title: National Coal Resources Data System Geospatial_Data_Presentation_Form: map Type_of_Source_Media: Digital database Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 19950000 Range_of_Dates/Times: Source_Currentness_Reference: Ground Condition Source_Citation_Abbreviation: Various Well Location Within Shape File Source_Contribution: Drill hole information was used to develop lines of cross section and subsurface coal-bed correlations in the Ashland coalfield. Process_Step: Process_Description: Multiple well locations were chosen to develop a representative cross section of the subsurface coal stratigraphy within the Ashland coalfield, Powder River Basin, Montana. These holes were chosen from the compiled drill-hole database and were used to create cross-section lines. This was done by importing the well locations as point data into arcview and "connecting the points" with arcs to define the cross section lines. Each line in the ARCVIEW theme is linked to a PDF graphic file displaying the stratigraphic cross section. The two cross sections were derived from drill hole data, and both show interpretations of Knobloch coal resource unit continuity within the Ashland coal field. The cross sections are constructed from natural-gamma (NG) and more limited spontaneous potential (SP) and resistivity (RES) geophysical log profiles. The majority of the natural-gamma logs are products of coal exploration drilling, whereas the spontaneous potential and resistivity logs are from oil and gas test wells. The datum is mean sea level for both cross sections, and the horizontal distribution of drill hole control points along each line of section is scaled to reflect the relative map distance between drill holes, although this horizontal scaling is approximate. The log profiles used in the cross sections were constructed from reduced geophysical logs. Where natural-gamma logs were used, a "mirrored" image of the log profile is displayed on the cross section to highlight the natural-gamma response in coal beds. Spontaneous potential and resistivity logs are displayed in tandem as is typical of these geophysical log records in oil and gas exploration. Process_Date: 19990000 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: USGS Central Region Energy Resources Team Contact_Person: Steve Roberts Contact_Position: Geologist Contact_Address: Address_Type: mailing address Address: Box 25046 MS 939 Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303.236.7788 Contact_Electronic_Mail_Address: sroberts@usgs.gov Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Complete Chain Point_and_Vector_Object_Count: 2 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: .0001 Longitude_Resolution: .0001 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: North American Datum 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: knxsec.dbf Entity_Type_Definition: Shapefile Attribute Table Entity_Type_Definition_Source: None Attribute: Attribute_Label: Length Attribute_Definition: Length of line Attribute_Definition_Source: Software computed Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 35655.0000 Range_Domain_Maximum: 44512.0000 Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: USGS Central Region Energy Resources Team Contact_Address: Address_Type: mailing address Address: Box 25046 MS 939 Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303.236.1647 Distribution_Liability: The US Geological Survey provides these geographic data "as is." The USGS makes no guarantee or warranty concerning the accuracy of information contained in this geographic data. The USGS further makes no warranties, either expressed or implied as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on USGS computers, no warranty, expressed or implied, is made by the USGS regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty. In no event shall the USGS have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the geographic data or arising out of the delivery, installation, operation, or support by the USGS. Metadata_Reference_Information: Metadata_Date: 19990000 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: USGS Central Region Energy Resources Team Contact_Person: Steve Roberts Contact_Address: Address_Type: mailing address Address: Box 25046 MS 939 Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303.236.7788 Metadata_Standard_Name: FGDC CSDGM Metadata_Standard_Version: 19940608