Coal Fields of the United States

Frequently-anticipated questions:

• What does this data set describe?
  1. How should this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  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?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
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• Who wrote the metadata?

What does this data set describe?

1. How should this data set be cited?

   USGS; Eastern Energy Team; John Tully (comp.), 200108, Coal Fields of the United States: National Atlas of the United States, Reston, VA.

   Online Links:

   • <http://nationalatlas.gov/atlasftp.html?openChapters=chpgeol#chpgeol>

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -176.000

   East_Bounding_Coordinate: -66.000

   North_Bounding_Coordinate: 70.981

   South_Bounding_Coordinate: 26.000

3. What does it look like?

   <http://pubs.usgs.gov/of/1996/of96-092/Comp/main.gif> (GIF)

   This is a simplified GIF image of the coal fields in the conterminous United States.

4. Does the data set describe conditions during a particular time period?

   Calendar_Date: Aug-2001

   Currentness_Reference: Publication date

5. What is the general form of this data set?

6. How does the data set represent geographic features?
   1. How are geographic features stored in the data set?

   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 GRS1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222.
      

7. How does the data set describe geographic features?

   Coal fields (described by coalfdp050.dbf)

   An area underlain by coal-bearing rocks. (Source: National Atlas of the United States)

   Shape

   The representation of the entity in the data. (Source: National Atlas of the United States)

   Value	Definition
   Polygon	2-dimensional element

   Area

   The size of the shape in square coverage units. In the distributed file, coverage units represent square decimal degrees. (Source: National Atlas of the United States)

   Range of values
   Minimum:	580104.500
   Maximum:	270722121728

   Perimeter

   The perimeter of shape in coverage units. In the distributed file, coverage units represent decimal degrees. (Source: National Atlas of the United States)

   Range of values
   Minimum:	3617.981
   Maximum:	10878455.000

   Coalfdp050

   Internal feature number (Source: National Atlas of the United States)

   Range of values
   Minimum:	2
   Maximum:	994

   Max_rank

   A unique code that indicates the maximum rank of coal within the field or part of a coal region. (Source: Trumbull, 1960, Coal Fields of the United States (Sheet 1): U.S. Geological Survey Map, 1:5000000. Barnes, 1961, Coal Fields of the United States (Sheet 2 - Alaska): U.S. Geological Survey Map, 1:500000.)

   Value	Definition
   0	An internal polygon where no coal is present.
   20	Anthracite coal that is potentially minable.
   25	Anthracite coal of other potential uses.
   30	Sub-bituminous coal that is potentially minable.
   35	Sub-bituminous coal of other potential uses.
   40	Low-volatile bituminous coal that is potentially minable.
   45	Low-volatile bituminous coal of other potential uses.
   50	Lignite coal that is potentially minable.
   55	Lignite coal of other potential uses.
   60	Medium and high volatile bituminous coal that is potentially minable.
   65	Medium and high volatile bituminous coal of other potential uses.

   Description

   A description of the maximum rank, denoting potential minability and other potential uses. (Source: Trumbull, 1960, Coal Fields of the United States (Sheet 1): U.S. Geological Survey Map, 1:5000000. Barnes, 1961, Coal Fields of the United States (Sheet 2 - Alaska): U.S. Geological Survey Map, 1:500000.)

   Value	Definition
   NO COAL / INTERNAL POLYGON	Non-coal area within a coal field.
   Anthracite / potentially minable	Anthracite is highly metamorphosed coal in which fixed carbon content is between 92% and 98% (on a dry, mineral-matter-free basis). It is hard and black, with a semimetallic luster and a semiconchoidal fracture. Can include meta-anthracite and semianthracite in this data set. Sufficient data exist to define these known coal areas.
   Anthracite / other uses	Anthracite is highly metamorphosed coal in which fixed carbon content is between 92% and 98% (on a dry, mineral-matter-free basis). It is hard and black, with a semimetallic luster and a semiconchoidal fracture. Can include meta-anthracite and semianthracite in this data set. Information on coal is meager or coals may be thin or of poor quality. Potential uses may include carbon dioxide sequestration, in-situ gasification, and coalbed methane production.
   Low Volatile Bituminous / potentially minable	Low volatile bituminous coal has a fixed carbon content equal to or greater than 78% and less than 86% and a volatile matter content greater than 14% and less than or equal to 22% (on a dry, mineral- matter-free basis). Sufficient data exist to define these known coal areas.
   Low Volatile Bituminous / other uses	Low volatile bituminous coal has a fixed carbon content equal to or greater than 78% and less than 86% and a volatile matter content greater than 14% and less than or equal to 22% (on a dry, mineral- matter-free basis). Information on coal is meager or coals may be thin or of poor quality. Potential uses include carbon dioxide sequestration, in-situ gasification, and coalbed methane production.
   Medium and High Volatile Bituminous / potentially minable	Medium volatile bituminous coal has a fixed carbon content equal to or greater than 69% and less than 78% and a volatile matter content greater than 22% and less than or equal to 31% (on a dry, mineral- matter-free basis). High volatile bituminous coal has less than 69% fixed carbon and greater than 31% volatile matter (on a dry, mineral-matter-free basis). Sufficient data exist to define these known coal areas.
   Medium and High Volatile Bituminous / other uses	Medium volatile bituminous coal has a fixed carbon content equal to or greater than 69% and less than 78% and a volatile matter content greater than 22% and less than or equal to 31% (on a dry, mineral- matter-free basis). High volatile bituminous coal has less than 69% fixed carbon and greater than 31% volatile matter (on a dry, mineral-matter-free basis). Information on coal is meager or coals may be thin or of poor quality. Potential uses include carbon dioxide sequestration, in-situ gasification, and coalbed methane production.
   Subbituminous / potentially minable	Subbituminous coal has gross calorific values less than 11,500 British thermal units per pound but greater than 8,300 British thermal units per pound (on a moist, mineral-matter-free basis). It is intermediate in rank between lignite and bituminous coal. Sufficient data exist to define these known coal areas.
   Subbituminous / other uses	Subbituminous coal has gross calorific values less than 11,500 British thermal units per pound but greater than 8,300 British thermal units per pound (on a moist, mineral-matter-free basis). It is intermediate in rank between lignite and bituminous coal. Information on coal is meager or coals may be thin or of poor quality. Potential uses include carbon dioxide sequestration, in-situ gasification, and coalbed methane production.
   Lignite / potentially minable	Lignite coal has gross calorific values less than 8,300 British thermal units per pound (on a moist, mineral-matter-free basis). It is the lowest rank of consolidated coal, usually brownish-black in color. Sufficient data exist to define these known coal areas.
   Lignite / other uses	Lignite coal has gross calorific values less than 8,300 British thermal units per pound (on a moist, mineral-matter-free basis). It is the lowest rank of consolidated coal, usually brownish-black in color. Information on coal is meager or coals may be thin or of poor quality. Potential uses include carbon dioxide sequestration, in-situ gasification, and coalbed methane production.

   Province

   The name of the coal province in which the field occurs. (Source: Trumbull, 1960, Coal Fields of the United States (Sheet 1): U.S. Geological Survey Map, 1:5000000. Barnes, 1961, Coal Fields of the United States (Sheet 2 - Alaska): U.S. Geological Survey Map, 1:500000.)

   Value	Definition
   Alaska	Province includes coal fields in Alaska.
   Eastern	Province includes coal fields along U.S. eastern seaboard.
   Gulf	Province includes coal fields along U.S. Gulf Coastal region.
   Interior	Province includes coal fields in the central U.S.
   Northern Great Plains	Province includes coal fields in the Northern Great Plains area between the Rocky Mountain and Interior coal provinces.
   Pacific Coast	Province includes coal fields along U.S. western seaboard.
   Rocky Mountain	Province includes coal fields in the Rocky Mountain region between Canadian and Mexican borders.

   Name

   The name of the coal field or region. (Source: National Atlas of the United States)

   Value	Definition
   <blank>	The area has no coal field or region name in the sources.
   Appalachian Region	The name given to the area, underlain by coal-bearing strata, which includes portions of Alabama, Georgia, Kentucky, Maryland, Mississippi, New York, Ohio, Pennsylvania, Tennessee, Virginia, and West Virginia in the Appalachian Mountains.
   Atlantic Coast Region	The name given to the area, underlain by coal-bearing strata, which includes portions of North Carolina, Virginia, and West Virginia.
   Bering River Field	The name given to the area, underlain by coal-bearing strata, which includes portions of Alaska near the Bering River.
   Big Horn Basin Region	The name given to the area, underlain by coal-bearing strata, which includes portions of Montana and Wyoming around the Big Horn Basin.
   Black Hills Region	The name given to the area, underlain by coal-bearing strata, which includes portions of South Dakota and Wyoming around the Black Hills.
   Black Mesa Field	The name given to the area, underlain by coal-bearing strata, which includes portions of northeastern Arizona near Black Mesa.
   Blackfeet-Valier Region	The name given to the area, underlain by coal-bearing strata, which includes portions of northwestern Montana.
   Broad Pass Field	The name given to the area, underlain by coal-bearing strata, which includes portions of central Alaska near Broad Pass.
   Bull Mountain Field	The name given to the area, underlain by coal-bearing strata, which includes portions of central Montana around Bull Mountain.
   Canon City Field	The name given to the area, underlain by coal-bearing strata, which includes portions of central Colorado around Canon City.
   Carthage Field	The name given to the area, underlain by coal-bearing strata, which includes portions of central New Mexico around Carthage.
   Centralia-Chehalis Field	The name given to the area, underlain by coal-bearing strata, which includes portions of southwestern Washington around Centralia and Chehalis.
   Cerrillos Field	The name given to the area, underlain by coal-bearing strata, which includes portions of north central New Mexico around Cerrillos.
   Chicago Creek Field	The name given to the area, underlain by coal-bearing strata, which includes portions of Alaska near Chicago Creek.
   Chignik Field	The name given to the area, underlain by coal-bearing strata, which includes portions of southwestern Alaska near Chignik.
   Coaldale Field	The name given to the area, underlain by coal-bearing strata, which includes portions of western Nevada around Coaldale.
   Coos Bay Field	The name given to the area, underlain by coal-bearing strata, which includes portions of Oregon around Coos Bay.
   Cretaceous Lignite Area	The name given to the area, underlain by coal-bearing strata, which includes portions of central Kansas.
   Datil Mountains Field	The name given to the area, underlain by coal-bearing strata, which includes portions of western New Mexico near the Datil Mountains.
   Deer Creek Field	The name given to the area, underlain by coal-bearing strata, which includes portions of southeastern Arizona.
   Denver Region	The name given to the area, underlain by coal-bearing strata, which includes portions of Colorado around Denver.
   Eagle Field	The name given to the area, underlain by coal-bearing strata, which includes portions of eastern Alaska near the town of Eagle.
   Eagle Pass Field	The name given to the area, underlain by coal-bearing strata, which includes portions of Texas near the town of Eagle Pass.
   Eagle Springs Field	The name given to the area, underlain by coal-bearing strata, which includes portions of western Texas.
   Eastern Region	The name given to the area, underlain by coal-bearing strata, which includes portions of Illinois, Indiana, Iowa, Kentucky, and Missouri.
   Eden Ridge Field	The name given to the area, underlain by coal-bearing strata, which includes portions of southwestern Oregon near Eden Ridge.
   Electric Field	The name given to the area, underlain by coal-bearing strata, which includes portions of Montana and Wyoming near the town of Electric.
   Engle Field	The name given to the area, underlain by coal-bearing strata, which includes portions of southwestern New Mexico near the town of Engle.
   Fort Union Region	The name given to the area, underlain by coal-bearing strata, which includes portions of Montana, North Dakota, South Dakota, and Wyoming around Fort Union.
   Garfield County Field	The name given to the area, underlain by coal-bearing strata, which includes portions of east central Montana in Garfield County.
   Glacier Field	The name given to the area, underlain by coal-bearing strata, which includes portions of northwestern Washington near the town of Glacier.
   Goose Creek Field	The name given to the area, underlain by coal-bearing strata, which includes portions of Idaho, Nevada, and Utah near the Goose Creek Mountains.
   Goshen Hole Field	The name given to the area, underlain by coal-bearing strata, which includes portions of Nebraska and Wyoming near Goshen Hole.
   Great Falls Field	The name given to the area, underlain by coal-bearing strata, which includes portions of central Montana near Great Falls.
   Green River Region	The name given to the area, underlain by coal-bearing strata, which includes portions of Colorado, Utah, and Wyoming.
   Hams Fork Region	The name given to the area, underlain by coal-bearing strata, which includes portions of Idaho, Utah, and Wyoming.
   Hanna Field	The name given to the area, underlain by coal-bearing strata, which includes portions of south central Wyoming near the town of Hanna.
   Henry Mountains Field	The name given to the area, underlain by coal-bearing strata, which includes portions of southern Utah near the Henry Mountains.
   Herendeen Bay Field	The name given to the area, underlain by coal-bearing strata, which includes portions of southwestern Alaska near Herendeen Bay.
   Horseshoe Bend Field	The name given to the area, underlain by coal-bearing strata, which includes portions of Idaho near the town of Horseshoe Bend.
   Ione Field	The name given to the area, underlain by coal-bearing strata, which includes portions of central California near the town of Ione.
   Jackson Hole Field	The name given to the area, underlain by coal-bearing strata, which includes portions of Wyoming near Jackson Hole.
   Jarvis Creek Field	The name given to the area, underlain by coal-bearing strata, which includes portions of eastern Alaska near Jarvis Creek.
   Jornada del Muerto Field	The name given to the area, underlain by coal-bearing strata, which includes portions of central New Mexico.
   Kelso-Castle Rock Area	The name given to the area, underlain by coal-bearing strata, which includes portions of southwestern Washington near the towns of Kelso and Castle Rock.
   Kenai Field	The name given to the area, underlain by coal-bearing strata, which includes portions of southern Alaska around Kenai.
   Kobuk Field	The name given to the area, underlain by coal-bearing strata, which includes portions of northwestern Alaska near the town of Kobuk.
   Lewistown Field	The name given to the area, underlain by coal-bearing strata, which includes portions of central Montana near Lewistown.
   Livingston-Trail Creek Field	The name given to the area, underlain by coal-bearing strata, which includes portions of southwestern Montana near Livingston and Trail Creek.
   Lombard Field	The name given to the area, underlain by coal-bearing strata, which includes portions of southwestern Montana near Lombard.
   Matanuska Field	The name given to the area, underlain by coal-bearing strata, which includes portions of southern Alaska near Matanuska.
   Mississippi Region	The name given to the area, underlain by coal-bearing strata, which includes portions of Alabama, Arkansas, Florida, Georgia, Kentucky, Mississippi, Missouri, and Tennessee.
   Missoula Field	The name given to the area, underlain by coal-bearing strata, which includes portions of western Montana near Missoula.
   Monero Field	The name given to the area, underlain by coal-bearing strata, which includes portions of northern New Mexico near Monero.
   Nenana Field	The name given to the area, underlain by coal-bearing strata, which includes portions of central Alaska near Nenana.
   North Central Fields	The name given to the area, underlain by coal-bearing strata, which includes portions of north central Pennsylvania.
   North Park Field	The name given to the area, underlain by coal-bearing strata, which includes portions of northern Colorado near North Park.
   North-Central Region	The name given to the area, underlain by coal-bearing strata, which includes portions of north central Montana.
   Northern Alaska Fields	The name given to the area, underlain by coal-bearing strata, which includes portions of northern Alaska.
   Northern Region	The name given to the area, underlain by coal-bearing strata, which includes portions of central Michigan.
   Orofino Field	The name given to the area, underlain by coal-bearing strata, which includes portions of Idaho near the town of Orofino.
   Pagosa Springs Field	The name given to the area, underlain by coal-bearing strata, which includes portions of south central Colorado near Pagosa Springs.
   Pennsylvania Anthracite Region	The name given to the area, underlain by coal-bearing strata, which includes portions of eastern Pennsylvania.
   Pinedale Field	The name given to the area, underlain by coal-bearing strata, which includes portions of eastern Arizona near the town of Pinedale.
   Powder River Region	The name given to the area, underlain by coal-bearing strata, which includes portions of Montana and Wyoming around the Powder River.
   Rampart Field	The name given to the area, underlain by coal-bearing strata, which includes portions of central Alaska near the town of Rampart.
   Raton Mesa Region	The name given to the area, underlain by coal-bearing strata, which includes portions of Colorado and New Mexico near the town of Raton, New Mexico.
   Rhode Island Meta-Anthracite Region	The name given to the area, underlain by coal-bearing strata, which includes portions of Massachusetts and Rhode Island.
   Rio Puerco Field	The name given to the area, underlain by coal-bearing strata, which includes portions of northwestern New Mexico.
   Rock Creek Field	The name given to the area, underlain by coal-bearing strata, which includes portions of southeastern Wyoming.
   Roslyn Cleelum Field	The name given to the area, underlain by coal-bearing strata, which includes portions of central Washington.
   San Carlos Field	The name given to the area, underlain by coal-bearing strata, which includes portions of western Texas.
   San Juan River Region	The name given to the area, underlain by coal-bearing strata, which includes portions of Arizona, Colorado, New Mexico, and Utah around the San Juan River.
   Santo Tomas Field	The name given to the area, underlain by coal-bearing strata, which includes portions of southern Texas around the town of Santo Tomas.
   Sierra Blanca Field	The name given to the area, underlain by coal-bearing strata, which includes portions of south central New Mexico.
   Skagit County Area	The name given to the area, underlain by coal-bearing strata, which includes portions of western Washington in Skagit County.
   South Park Field	The name given to the area, underlain by coal-bearing strata, which includes portions of central Colorado.
   Southwestern Region	The name given to the area, underlain by coal-bearing strata, which includes portions of central Texas.
   Southwestern Utah Region	The name given to the area, underlain by coal-bearing strata, which includes portions of southwestern Utah.
   Stillwater Field	The name given to the area, underlain by coal-bearing strata, which includes portions of southern Montana in Stillwater County.
   Stone Canyon Field	The name given to the area, underlain by coal-bearing strata, which includes portions of central California.
   Summit Creek Field	The name given to the area, underlain by coal-bearing strata, which includes portions of western Washington.
   Susitna Field	The name given to the area, underlain by coal-bearing strata, which includes portions of southern Alaska near the town of Susitna.
   Terlingua Field	The name given to the area, underlain by coal-bearing strata, which includes portions of southwestern Texas near the town of Terlingua.
   Tertiary Lake Beds Region	The name given to the area, underlain by coal-bearing strata, which includes portions of western Montana.
   Texas Region	The name given to the area, underlain by coal-bearing strata, which includes portions of Arkansas, Louisiana, and Texas.
   Tijeras Field	The name given to the area, underlain by coal-bearing strata, which includes portions of central New Mexico near the town of Tijeras.
   Tongue Mesa Field	The name given to the area, underlain by coal-bearing strata, which includes portions of southwestern Colorado.
   Uinta Region	The name given to the area, underlain by coal-bearing strata, which includes portions of Colorado and Utah.
   Una del Gato Field	The name given to the area, underlain by coal-bearing strata, which includes portions of central New Mexico.
   Unga Island Field	The name given to the area, underlain by coal-bearing strata, which includes portions of southwestern Alaska near Unga Island.
   Western Region	The name given to the area, underlain by coal-bearing strata, which includes portions of Arkansas, Iowa, Kansas, Missouri, Nebraska, and Oklahoma.
   Whatcom County Area	The name given to the area, underlain by coal-bearing strata, which includes portions of western Washington in Whatcom County.
   Wind River Region	The name given to the area, underlain by coal-bearing strata, which includes portions of central Wyoming.

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • USGS; Eastern Energy Team; John Tully (comp.)

2. Who also contributed to the data set?

3. To whom should users address questions about the data?
   Susan J. Tewalt
   956 National Center
   Reston, Virginia 20192
   USA
   

   703-648-6437 (voice)
   

Why was the data set created?

These data are intended for geographic display and analysis at the National level, and for large regional areas. The data should be displayed and analyzed at scales appropriate for 1:5,000,000-scale data. No responsibility is assumed by the U.S. Geological Survey or the National Atlas of the United States in the use of these data.

How was the data set created?

1. From what previous works were the data drawn?

   CF1908 (source 1 of 18)

   Campbell, M.R., 1908, Coal Fields of the United States: U.S. Geological Survey, Washington, DC.

   Type_of_Source_Media: Paper

   Source_Scale_Denominator: 7500000

   Source_Contribution: Spatial and attribute information

   CF1942 (source 2 of 18)

   Averitt, P., 1942, Coal Fields of the United States: U.S. Geological Survey, Washington, DC.

   Type_of_Source_Media: Paper

   Source_Scale_Denominator: 2500000

   Source_Contribution: Spatial and attribute information

   CF1960 (source 3 of 18)

   Trumbull, J., 1960, Coal Fields of the United States, sheet 1: U.S. Geological Survey, Washington, DC.

   Type_of_Source_Media: Paper

   Source_Scale_Denominator: 5000000

   Source_Contribution: Spatial and attribute information

   CF1961 (source 4 of 18)

   Barnes, F.F., 1961, Coal Fields of the United States, sheet 2: U.S. Geological Survey, Washington, DC.

   Type_of_Source_Media: Paper

   Source_Scale_Denominator: 5000000

   Source_Contribution: Spatial and attribute information

   Coal88 (source 5 of 18)

   Wood, Jr., G.H., and Bour, III, W.V., 1988, Coal Map of North America, south sheet: U.S. Geological Survey, Reston, VA.

   Type_of_Source_Media: Paper

   Source_Scale_Denominator: 5000000

   Source_Contribution: Spatial and attribute information

   Missouri (source 6 of 18)

   Survey, Missouri Geological , 1979, Geologic Map of Missouri.

   Type_of_Source_Media: Paper

   Source_Scale_Denominator: 500000

   Source_Contribution: Spatial and attribute information

   Mississippi (source 7 of 18)

   Society, Mississippi Geological , and U.S. Geological Survey, 1945, Geologic Map of Mississippi.

   Type_of_Source_Media: Paper

   Source_Scale_Denominator: 500000

   Source_Contribution: Spatial and attribute information

   Louisiana (source 8 of 18)

   Survey, Louisiana Geological , 1984, Geologic Map of Louisiana.

   Type_of_Source_Media: Paper

   Source_Scale_Denominator: 500000

   Source_Contribution: Spatial and attribute information

   Arkansas (source 9 of 18)

   Commission, Arkansas Geological , and U.S. Geological Survey, 1976, Geologic Map of Arkansas.

   Type_of_Source_Media: Paper

   Source_Scale_Denominator: 500000

   Source_Contribution: Spatial and attribute information

   Texas (source 10 of 18)

   Texas Bureau of Economic Geology, 1992, Geologic Map of Texas.

   Type_of_Source_Media: Paper

   Source_Scale_Denominator: 500000

   Source_Contribution: Spatial and attribute information

   Georgia (source 11 of 18)

   Georgia Department of Natural Resources, and Survey, Georgia Geological , 1975, Geologic Map of Georgia.

   Type_of_Source_Media: Paper

   Source_Scale_Denominator: 500000

   Source_Contribution: Spatial and attribute information

   Kentucky (source 12 of 18)

   Survey, Kentucky Geological , and U.S. Geological Survey, 1981, Geologic Map of Kentucky.

   Type_of_Source_Media: Paper

   Source_Scale_Denominator: 250000

   Source_Contribution: Spatial and attribute information

   Tennessee (source 13 of 18)

   Tennessee Department of Conserv, Division of Geology, 1966, Geologic Map of Tennessee.

   Type_of_Source_Media: Paper

   Source_Scale_Denominator: 250000

   Source_Contribution: Spatial and attribute information

   Alabama (source 14 of 18)

   Geological Survey of Alabama, 1989, Geologic Map of Alabama.

   Type_of_Source_Media: Paper

   Source_Scale_Denominator: 500000

   Source_Contribution: Spatial and attribute information

   CFALL (source 15 of 18)

   U.S. Geological Survey, 1995, Coal Fields Data Set: U.S. Geological Survey, Reston, VA.

   Type_of_Source_Media: Online

   Source_Scale_Denominator: 5000000

   Source_Contribution: Spatial and attribute information

   CFNEW (source 16 of 18)

   U.S. Geological Survey, 2001, Coal Fields Data Set: U.S. Geological Survey, Reston, VA.

   Type_of_Source_Media: Online

   Source_Scale_Denominator: 5000000

   Source_Contribution: Spatial and attribute information

   KEYSTONE (source 17 of 18)

   Corporation, Intertec Publishing , 2000, Keystone Coal Industry Manual: Intertec Publishing Corporation, Chicago, Illinois.

   Type_of_Source_Media: Book

   Source_Contribution: Attribute information

   ATLASHY (source 18 of 18)

   National Atlas of the United States, 1999, Hydrography Features of the United States: National Atlas of the United States, Reston, VA.

   Type_of_Source_Media: Online

   Source_Scale_Denominator: 2000000

   Source_Contribution: Spatial and attribute information

2. How were the data generated, processed, and modified?

   Date: 1995 (process 1 of 4)

   All the paper maps were manually digitized on a tablet using Arc/INFO. All data were then appended into one data set. This data set was edited to resolve inconsistencies between maps and to form a polygon coverage. The final data set was then attributed using the coaltype codes described within this document.

   Data sources used in this process:

   • CF1908
   • CF1942
   • CF1960
   • CF1961
   • Coal88
   • Missouri
   • Mississippi
   • Louisiana
   • Arkansas
   • Texas
   • Georgia
   • Kentucky
   • Tennessee
   • Alabama

   Data sources produced in this process:

   • CFALL

   Date: 2001 (process 2 of 4)

   Some arcs in Alaska, Florida, Michigan, Oregon, Rhode Island, Texas, and Washington were adjusted to align with the National Atlas shoreline.

   Data sources used in this process:

   • CFALL
   • ATLASHY

   Data sources produced in this process:

   • CFNEW

   Date: 2001 (process 3 of 4)

   Coal province and coal field/region name attributes were added to polygons based on the CF1960 and CF1961 maps. One additional name was obtained from State coal field summaries in KEYSTONE.

   Data sources used in this process:

   • CF1960
   • CF1961
   • KEYSTONE
   • CFNEW

   Date: 2001 (process 4 of 4)

   The polygon coverage was converted to a shapefile.

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?

   This map layer is a representation of the coal fields in the conterminous United States and Alaska. There are no coal fields in Hawaii.

5. How consistent are the relationships among the observations, including topology?

   Topology for this map layer was built using the CLEAN command within Arc/INFO. This command eliminates dangling nodes, calculates intersections of arcs, eliminates redundant arcs, and creates a polygon attribute table.

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:

None. Acknowledgement of the National Atlas of the United States of America would be appreciated in products derived from these data.

1. Who distributes the data set? (Distributor 1 of 1)
   Susan J. Tewalt
   MS 956 National Center
   Reston, Virginia 20192
   USA
   

   703-648-6437 (voice)
   

2. What's the catalog number I need to order this data set?

3. What legal disclaimers am I supposed to read?

   Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made by the U.S. Geological Survey regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. No responsibility is assumed by the U.S. Geological Survey in the use of these data.

   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?
   • Availability in digital form:

     Data format:	ESRI shapefile
     Network links:	<http://nationalatlas.gov/atlasftp.html?openChapters=chpgeol#chpgeol>

     Data format:	SDTS
     Network links:	<http://nationalatlas.gov/atlasftp.html?openChapters=chpgeol#chpgeol>

   • Cost to order the data: There is no charge for the map layer.

Who wrote the metadata?

Dates:

Last modified: 20-Jun-2006

Metadata author:

Peg Rawson
National Atlas of the United States
12201 Sunrise Valley Dr
Reston, VA 20192

703-648-4183 (voice)
atlasmail@usgs.gov

Metadata standard:

FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)