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Geologic Unit: Farmington
Map showing publication footprint
  • Usage in publication:
    • Farmington shale
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Shale
  • AAPG geologic province:
    • Illinois basin
Publication:

Savage, T.E., 1927, Significant breaks and overlaps in the Pennsylvanian rocks of Illinois: American Journal of Science, 5th series, v. 14, no. 38, p. 307-316.


Summary:

Pg. 309. Farmington shale in McLeansboro formation. Applied Farmington shale to that part of McLeansboro formation of Fulton County, central western Illinois, underlying Lonsdale limestone and overlying coal No. 7. Thickness and origin of name not stated, but probably named from the town in Fulton County. Age is Pennsylvanian.

Source: US geologic names lexicon (USGS Bull. 896, p. 722).


Map showing publication footprint
  • Usage in publication:
    • Farmington shale
  • Modifications:
    • Principal reference
    • Revised
  • AAPG geologic province:
    • Illinois basin
Publication:

Wanless, H.R., 1957, Geology and mineral resources of the Beardstown, Glasford, Havana, and Vermont quadrangles: Illinois Geological Survey Bulletin, no. 82, 233 p.


Summary:

Pg. 50 (fig. 22), 116, 189, 190, 191, 193, 194, 195. Farmington shale of McLeansboro group. Shale is gray to olive green; commonly contains gray ironstone concretions as much as 2 inches thick by 1 foot in maximum diameter. Maximum thickness 50 feet. Locally, in Glasford quadrangle, entirely cut out by Gimlet sandstone. Included in Sparland cyclothem. Overlies Sparland (No. 7) coal, which in turn overlies Copperas Creek sandstone. Age is Pennsylvanian. Derivation of name given.
Type locality: outcrops in Farmington Twp., in T. 8 N., R. 4 E., Fulton Co., IL.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1326).


Map showing publication footprint
  • Usage in publication:
    • Farmington shale member
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Illinois basin
Publication:

Kosanke, R.M., Simon, J.A., Wanless, H.R., and Willman, H.B., 1960, Classification of the Pennsylvanian strata of Illinois: Illinois Geological Survey Report of Investigations, no. 214, 84 p.


Summary:

Pg. 38, 49 (table 1), pl. 1. Farmington shale member of Modesto formation (new) of McLeansboro group. Reallocated to member status in Modesto formation. Underlies Gimlet sandstone member. Age is Pennsylvanian. Presentation of new rock-stratigraphic classification of Pennsylvanian strata of Illinois.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1326).


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

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).

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