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Map showing publication footprint
  • Usage in publication:
    • Dunlieth formation
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Dolomite
  • AAPG geologic province:
    • Wisconsin arch
Publication:

Templeton, J.S., and Willman, H.B., 1952, Guidebook for the 16th annual field conference, central northern Illinois: Tri-State Annual Field Conference Guidebook, October 11-12, 1952, no. 16, 47 p., Also issued as Illinois State Geol. Survey Gdbk., 2nd ser., 1952. http://archive.org/details/guidebookforsixt02tris


Summary:

Pg. 6, 23-24, figs. 3, 9. Dunlieth formation of Galena group. Dolomite, pure and argillaceous in alternating units, cherty, medium crystalline, medium- to thick-bedded; green shale partings. Thickness up to 125 feet. Differentiated into 10 members (ascending) Buckhorn, St. James, Beecher, Eagle Point, Fairplay, Mortimer, Rivoli, Sherwood, Wall, and Wyota. Age is Middle Ordovician.
Type area: in extreme northwestern IL.
[GNC remark (ca. 1966, US geologic names lexicon, USGS Bull. 1200, p. 1182): In copy of guidebook used by compiler [G.C. Keroher], in figures 3 and 9, name Buckhorn had been crossed out and name Red Oak written in.]

Source: US geologic names lexicon (USGS Bull. 1200, p. 1182).


Map showing publication footprint
  • Usage in publication:
    • Dunleith Formation
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Wisconsin arch
Publication:

Willman, H.B., and Kolata, D.R., 1978, The Platteville and Galena Groups in northern Illinois: Illinois Geological Survey Circular, no. 502, __ p.


Summary:

Pg. 50-51. Dunleith Formation. Revised in Illinois to include Loves Park Member (new), above Fairplay Member and below Wyota Member. Loves Park includes Calmar, Conover, Nasset, and Haldane Bentonite Beds (all new), and is equivalent of Mortimer, Rivoli, Sherwood, and Wall Members of Dunleith Formation in area east and south of Freeport, Illinois, where those members cannot be divided.
[See entries under Loves Park, Calmar, Conover, Nasset, and Haldane.]

Source: Inferred from US geologic names lexicon (USGS Bull. 1564, p. 26, 36-37, 70, 100, 117).


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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