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National Geologic Map Database
Geologic Unit: Dubuque
Map showing publication footprint
  • Usage in publication:
    • Dubuque formation
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Limestone
    • Shale
  • AAPG geologic province:
    • Iowa shelf
Publication:

Sardeson, F.W., 1907, Galena series: Geological Society of America Bulletin, v. 18, p. 179-194.


Summary:

Pg. 193. Dubuque formation. Irregular limestone and interlaminated carbonaceous shales, 10 feet thick at Dubuque, eastern Iowa, extending from "cap rock" below up to blue shales of Maquoketa member of Maquoketa series. Coincides with TRIPLICIA bed or zone, and forms basal part of Maquoketa series or stage. Overlain by Maquoketa formation proper and underlain by Galena formation. Age is Late Ordovician.
Named from Dubuque, Dubuque Co., eastern IA.

Source: US geologic names lexicon (USGS Bull. 896, p. 636-637).


Map showing publication footprint
  • Usage in publication:
    • Dubuque limestone
  • Modifications:
    • Revised
    • Age modified
  • AAPG geologic province:
    • Wisconsin arch
    • Iowa shelf
Publication:

Ulrich, E.O., 1924, Notes on new names in table of formations and on physical evidence of breaks between Paleozoic systems in Wisconsin: Wisconsin Academy of Sciences, Arts and Letters, v. 21, p. 71-107.


Summary:

Pg. 71-93. Dubuque limestone. Is basal Richmond, and older than Fernvale limestone [which to south underlies Maquoketa shale], and older than Maquoketa shale. In western Wisconsin and Iowa the Maquoketa overlies Dubuque formation where Dubuque is present. Age is Late Ordovician.
[See also under Volga shales.]

Source: US geologic names lexicon (USGS Bull. 896, p. 636-637).


Map showing publication footprint
  • Usage in publication:
    • Dubuque formation
  • Modifications:
    • Revised
    • Age modified
  • AAPG geologic province:
    • Wisconsin arch
Publication:

Trowbridge, A.C., 1935, [Road logs and stratigraphic sections], IN Kay, G.F., and Trowbridge, A.C., Conference leaders, Upper Mississippi Valley, Iowa City, Iowa, to Duluth, Minnesota: Kansas Geological Society Guidebook for the Annual Field Conference, August 25-September 1, 1935, no. 9, p. 1-236, 423-471., Prepared in cooperation with Iowa, Illinois, Wisconsin, and Minnesota geol. surveys


Summary:

Pg. 61, etc. Dubuque formation. Classify Dubuque as of Trenton age and include it in Galena group, as they call the Galena dolomite. On p. 27 Trowbridge stated Prosser, Stewartville, and Dubuque can be seen in Jo Daviess County, Illinois. Age is Late Ordovician.

Source: US geologic names lexicon (USGS Bull. 896, p. 636-637).


Map showing publication footprint
  • Usage in publication:
    • Dubuque formation*
  • Modifications:
    • Adopted
  • AAPG geologic province:
    • Iowa shelf
    • Wisconsin arch
Publication:

Wilmarth, M.G., 1936, [Selected Geologic Names Committee remarks (ca. 1936) on Cambrian and Ordovician rocks of the U.S.], 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:

Dubuque formation of Richmond group. Adopted by the USGS. Present in eastern Iowa, southeastern Minnesota, southwestern Wisconsin, and northwestern Illinois. Age is Late Ordovician.
Named from Dubuque, Dubuque Co., IA.

Source: US geologic names lexicon (USGS Bull. 896, p. 636-637).


Map showing publication footprint
  • Usage in publication:
    • Dubuque member
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Iowa shelf
Publication:

Stauffer, C.R., and Thiel, G.A., 1941, The Paleozoic and related rocks of southeastern Minnesota: Minnesota Geological Survey Bulletin, no. 29, 261 p., (incl. geologic map)


Summary:

Pg. 90-92. Dubuque member of Maquoketa formation. Considered member of Maquoketa formation in Minnesota. Thickness about 30 feet. Underlies Wykoff member; overlies Stewartville member of Galena limestone.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1168-1169).


Map showing publication footprint
  • Usage in publication:
    • Dubuque formation
  • Modifications:
    • Revised
  • 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, fig. 3. Dubuque formation of Galena group. In Dixon-Oregon area, northern Illinois, considered uppermost formation in Galena group. Thickness about 30 feet. Overlies Wise Lake formation (new).

Source: US geologic names lexicon (USGS Bull. 1200, p. 1168-1169).


Map showing publication footprint
  • Usage in publication:
    • Dubuque shaly member
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Wisconsin arch
    • Iowa shelf
Publication:

Agnew, A.F., Behre, C.H., Jr., Heyl, A.V., Jr., and Lyons, E.J., 1956, Stratigraphy of Middle Ordovician rocks in the zinc-lead district of Wisconsin, Illinois, and Iowa [Mississippi Valley], IN Shorter contributions to general geology, 1955-57: U.S. Geological Survey Professional Paper, 274-K, p. K251-K312. [Available online from the USGS PubsWarehouse: http://pubs.er.usgs.gov/pubs/pp/pp274K]


Summary:

Pg. 26, 297-299; A.V. Heyl, Jr., and others, 1959, USGS Prof. Paper 309, p. 17-18. Dubuque shaly member of Galena dolomite. Referred to as shaly member of Galena dolomite; overlies Stewartville massive member. In mining district member is light-gray to buff fine-grained sugary and silty dolomitic limestone that weathers to yellowish buff; medium- to thin-bedded and contains interbeds of platy dolomitic shale. Thickness 35 to 45 feet. Age of Galena is Middle Ordovician.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1168-1169).


Map showing publication footprint
  • Usage in publication:
    • Dubuque formation
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Iowa shelf
Publication:

Weiss, M.P., 1957, Upper Middle Ordovician stratigraphy of Fillmore County, Minnesota: Geological Society of America Bulletin, v. 68, no. 8, p. 1027-1062.


Summary:

Pg. 1029 (fig. 1), 1040-1042, pl. 1. Dubuque formation. This report [Fillmore County, Minnesota] follows Kay's (1935, Jour. Geol., v. 43, no. 5) concept of type section. At type section, interval of transition from Stewartville rock to Dubuque rock is thicker than it commonly is in Minnesota. The Dubuque is unit of interbedded limestone and shale and contains two feldspathized shale beds. Control on thickness of Dubuque in southeastern Minnesota and adjacent Iowa is meager, but it is about 34 feet thick at two outcrops; in Fillmore County, outcrops are close to eroded edge of formation. Overlies Stewartville member of Galena formation; underlies Maquoketa formation. Age is upper Middle Ordovician.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1168-1169).


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

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).