U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Geologic Unit: Oneota
Search archives
Map showing publication footprint
  • Usage in publication:
    • Oneota dolomite
  • Modifications:
    • Revised
    • Overview
  • AAPG geologic province:
    • Sioux uplift
Publication:

Powell, L.H., 1935, A study of the Ozarkian faunas of southeastern Minnesota: The Science Museum of The Saint Paul Institute, Science Bulletin, no. 1, 80 p.


Summary:

Revised in that Oneota overlies newly named Blue Earth siltstone bed; Blue Earth is exposed from Ottawa, Le Sueur Co to Mankato, Blue Earth Co, MN and for some distance up Blue Earth River, Sioux uplift. Underlies Shakopee dolomite. Oneota correlates (chart) with (ascending) Gunter, Van Buren, and Gasconade [formations]. Fossil list and descriptions. Ordovician age.

Source: GNU records (USGS DDS-6; Denver GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Oneota Formation
  • Modifications:
    • Revised
    • Overview
  • Dominant lithology:
    • Dolomite
    • Chert
  • AAPG geologic province:
    • Wisconsin arch
Publication:

Clayton, Lee, and Attig, J.W., 1990, Geology of Sauk County, Wisconsin; With a section about the Precambrian geology by B.A. Brown and an appendix naming the Rountree Formation by J.C. Knox, D.S. Leigh, and T.A. Frolking: Wisconsin Geological and Natural History Survey Information Circular, IC 67, 68 p., (incl. geologic map, scale 1:100,000)


Summary:

Coon Valley, originally defined as upper member of Jordan Sandstone, here included at base of Oneota Formation. In Sauk Co., WI, Oneota generally consists of approximately 25 m of hard dolomite. Grain sizes vary from very fine sand to medium sand. Dolomite generally ranges from very pale brown to light brownish gray when fresh. White chert nodules and beds occur throughout. Quartz sand, oolitic dolomite, algal structures, and chert near base constitute Coon Valley Member. Elsewhere these sandy beds have been designated Hickory Ridge and Stockton Hill Members. Oneota underlies Rountree Formation (new name) or St. Peter Formation.

Source: GNU records (USGS DDS-6; Reston GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Oneota Dolomite
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Upper Mississippi embayment
Publication:

Runkel, A.C., 1994, Deposition of the uppermost Cambrian (Croixan) Jordan Sandstone, and the nature of the Cambrian-Ordovician boundary in the Upper Mississippi Valley: Geological Society of America Bulletin, v. 106, no. 4, p. 492-506.


Summary:

Rather than being in conformable contact (as is commonly assumed), Early Ordovician Oneota Dolomite is here interpreted as unconformably overlying the Late Cambrian (Croixan) Jordan Sandstone. The Oneota remains transgressive, in contrast to new evidence that the Jordan is here determined to be entirely marine and regressive. The fact that the unconformity is regional has important implications for boundary placement in the entire Upper Mississippi Valley. Report includes measured sections and cross section.

Source: GNU records (USGS DDS-6; Reston GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Oneota Dolomite*
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Illinois basin

Search archives

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 ([ ]).