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National Geologic Map Database
Geologic Unit: Davis
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Map showing publication footprint
  • Usage in publication:
    • Davis formation
  • Modifications:
    • Areal extent
  • Dominant lithology:
    • Shale
    • Limestone
    • Dolomite
  • AAPG geologic province:
    • Ozark uplift
Publication:

Buehler, H.A., 1907, The lime and cement resources of Missouri: Missouri Bureau of Geology and Mines Report, 2nd series, v. 6, 255 p.


Summary:

Pg. 231. Davis formation. Bluish, impure, calcareous shale intercalated with thin beds of magnesium limestone and dolomite. Thickness 100 feet. Underlies Derby and overlies Bonne Terre [Bonneterre] formations. [Age is Late Cambrian.]

Source: US geologic names lexicon (USGS Bull. 896, p. 575).


Map showing publication footprint
  • Usage in publication:
    • Davis Member
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Illinois basin
Publication:

Willman, H.B., Atherton, Elwood, Buschbach, T.C., Collinson, Charles, Frye, J.C., Hopkins, M.E., Lineback, J.A., and Simon, J.A., 1975, Handbook of Illinois stratigraphy: Illinois Geological Survey Bulletin, no. 95, 261 p.


Summary:

Davis Member is recognized as base of Franconia Formation throughout IL except the extreme north where entire Franconia is represented by shaly and glauconitic sandstone, and in the southeast (Lawrence and Hamilton Cos.) where the unit appears to grade into dolomite and is included in Knox Megagroup. Grades from shaly sandstone in the north to silty, argillaceous dolomite in the south. Characterized by green, gray, or red shale partings and by flat-pebble conglomerate. Ranges from a few feet thick in the north to about 100 ft in the south.

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


Map showing publication footprint
  • Usage in publication:
    • Davis Formation*
    • Davis Member*
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Illinois basin
    • Ozark uplift

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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 ([ ]).