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Geologic Unit: Alton
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Map showing publication footprint
  • Usage in publication:
    • Alton coal group
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Coal
    • Shale
    • Slate
    • Clay
  • AAPG geologic province:
    • Appalachian basin
Publication:

Ashburner, C.A., 1880, The geology of McKean County, [Pennsylvania], and its connection with that of Cameron, Elk, and Forest: Pennsylvania Geological Survey Report of Progress, 2nd series, v. R, 371 p.


Summary:

Alton coal group in Pottsville formation. Chiefly shale, slate, and fire clay; usually contains 3 well-marked coal beds (Alton upper, Alton middle, and Alton lower). No limestone or calcareous beds. Thickness 20 to 35 feet. In Alton basin, in Lafayette Township, McKean County, central northern Pennsylvania, it is 30 to 35 feet thick. The lower coal is at base and its fire clay rests on Kinzua Creek [Connoquenessing] sandstone. Underlies Johnson Run [Homewood] sandstone. Is = Mercer coal group without question. Age is Pennsylvanian.

Source: US geologic names lexicon (USGS Bull. 896, p. 40-41).


Map showing publication footprint
  • Usage in publication:
    • Alton coal group
  • Modifications:
    • [Not used]
  • AAPG geologic province:
    • Appalachian basin
Publication:

White, I.C., 1891, Stratigraphy of the bituminous coal field of Pennsylvania, Ohio, and West Virginia: U.S. Geological Survey Bulletin, 65, 212 p.


Summary:

Pg. 201. The Alton coal group of Ashburner in McKean County, central northern Pennsylvania, probably represents Mercer coals.

Source: US geologic names lexicon (USGS Bull. 896, p. 40-41).


Map showing publication footprint
  • Usage in publication:
    • Alto [Alton] coal group
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Appalachian basin
Publication:

Wilmarth, M.G., 1925, [Selected Geologic Names Committee remarks (ca. 1925) on Carboniferous and Permian rocks of the Appalachians], IN Wilmarth, M.G., 1938, Lexicon of geologic names of the United States (including Alaska): U.S. Geological Survey Bulletin, 896, pts. 1-2, 2396 p.


Summary:

Alto [Alton] coal group in Pottsville formation. Same as Mercer shale member of Pottsville formation, the approved name. Recognized in McKean County, central northern Pennsylvania. Age is Pennsylvanian.

Source: US geologic names lexicon (USGS Bull. 896, p. 40-41).


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For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

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