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Geologic Unit: LaSalle
Map showing publication footprint
  • Usage in publication:
    • LaSalle formation
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Shale
    • Sandstone
    • Coal
  • AAPG geologic province:
    • Wisconsin arch
Publication:

DeWolf, F.W., 1910, Studies of Illinois coal, IN Yearbook for 1909: Illinois Geological Survey Bulletin, no. 16, p. 177-301.


Summary:

Pg. 180. LaSalle formation. Shales, sandstones, and thin coals lying between base of coal No. 2 (below) and base of coal No. 5 (above). Thickness 160 to 190 feet in northern Illinois and 250 to 320 feet in southern Illinois. Overlies Pottsville formation and underlies Petersburg formation. [Age is Pennsylvanian.]

Source: US geologic names lexicon (USGS Bull. 896, p. 1153).


Map showing publication footprint
  • Usage in publication:
    • LaSalle formation†
  • Modifications:
    • Abandoned
  • AAPG geologic province:
    • Wisconsin arch
Publication:

Wilmarth, M.G., 1925, [Selected Geologic Names Committee remarks (ca. 1900-1925) on Carboniferous rocks of the Illinois basin], 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:

†LaSalle formation abandoned. Preoccupied by LaSalle limestone member. Strata constitute lower part of Carbondale formation.
Named from LaSalle Co., northeastern IL.

Source: US geologic names lexicon (USGS Bull. 896, p. 1153).


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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