Washington Formation
Stratigraphic range: Permian
Bituminous coal (Washington Coal, Upper Pennsylvanian; Ohio)
TypeFormation
Unit ofDunkard Group[1]
Sub-unitsUpper Washington

Jollytown coal
Hundred sandstone
Upper Marietta
Washington “A” coal
Middle Washington
Lower Washington
Lower Marietta
Washington (No. 12) coal
Little Washington coal
Mannington sandstone
Waynesburg “A” coal
Waynesburg Sandstone
Elm Grove limestone

Cassville
UnderliesGreene Formation
OverliesWaynesburg Formation
Lithology
Primarylimestone, sandstone, coal
Othershale
Location
Region Ohio and  West Virginia
CountryUnited States

The Washington Formation is a coal, sandstone, and limestone geologic formation located in Ohio, Pennsylvania and West Virginia.[1] It dates back to the Lower Permian period, with its base at or near the Permian/Carboniferous boundary.[2] [3] The Washington formation and the Dunkard Group as a whole was deposited at a time when the continents were in the process of forming the "Super Continent" Pangaea as well as a gradual drop in sea levels.[4] The result during this period was coals being thinner and impure with high ash content. The limestones found with in the formation are exclusively freshwater deposits.

References

  1. 1 2 Berryhill, Henry L. Jr.; Swanson, Vernon E. (1962). "Geological Survey research 1962; Short papers in geology and hydrology" (PDF). U.S. Geological Survey Professional Paper. 450-C: 43–46. Retrieved 30 June 2018.
  2. ↑ Wayne Martin, Bernard Henniger (1965). "The Hockingport and Waynesburg Sandstones (Pennsylvanian and Permian) of the Dunkard Group: ABSTRACT". AAPG Bulletin. 49. doi:10.1306/a66335b4-16c0-11d7-8645000102c1865d. ISSN 0149-1423.
  3. ↑ M. A. Rendina, Wayne D. Martin (1985). "Provenance of Selected Sandstones and Mud Rocks of Dunkard Group (Upper Pennsylvanian-Permian) in Ohio, West Virginia, and Pennsylvania: ABSTRACT". AAPG Bulletin. 69. doi:10.1306/94885417-1704-11d7-8645000102c1865d. ISSN 0149-1423.
  4. ↑ Haq, Bilal U.; Schutter, Stephen R. (2008-10-03). "A Chronology of Paleozoic Sea-Level Changes". Science. 322 (5898): 64–68. doi:10.1126/science.1161648. ISSN 0036-8075.


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