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Geologic Unit: Derby
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Map showing publication footprint
  • Usage in publication:
    • Derby formation
  • Modifications:
    • Principal reference
  • Dominant lithology:
    • Dolomite
  • AAPG geologic province:
    • Ozark uplift
Publication:

Buckley, E.R., 1909, Geology of the disseminated lead deposits of St. Francois and Washington Counties [Missouri]: Missouri Bureau of Geology and Mines Report, 2nd series, v. 9, pt. 1, 259 p.


Summary:

Pg. 15, 44+. Derby formation. Dolomite, fine-grained, crystalline, slightly calcareous, light-gray to yellowish-gray or reddish-brown; some alternating soft porous beds. Thickness 38 to 40 feet. Conformably underlies Doerun formation and conformably overlies Davis formation. [Age is Late Cambrian.]
Type locality: on Harris Branch near Derby Mine (Federal Mine No. 2), about 1 mi south of railroad stations at Elvins, [Flat River 7.5-min quadrangle], St. Francois Co., eastern MO. Named from Derby Mine.

Source: Publication; US geologic names lexicon, USGS Bull. 896, p. 600.


Map showing publication footprint
  • Usage in publication:
    • Derby-Doe Run 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:

Used as [/]Derby-Doe Run Member of Franconia Formation in IL. Name is hyphenated because the two units were named separately, in MO, but have similar lithology and conformable relationship. In north-central IL, Derby-Doe Run is silty, argillaceous dolomite. Farther south it becomes quite pure, except for a thin zone at the top that is slightly sandy, argillaceous, and glauconitic. Member is about 20 ft thick in the north and thickness to probably more than 500 ft to the southeast. Age is Late Cambrian (Franconian).
[The use of a hyphen between undifferentiated [members] is not considered proper notation (CSN, 1933).]

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


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

Map showing publication footprint
  • Usage in publication:
    • Derby Formation*
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Ozark uplift
Publication:

Nelson, W.J., 1998, Bedrock geology of the Paducah 1 degree x 2 degrees CUSMAP quadrangle, Illinois, Kentucky, and Missouri, IN The Paducah CUSMAP quadrangle, resource and topographical investigations: U.S. Geological Survey Bulletin, 2150-B, p. B1-B36, (incl. geologic map, scale 1:250,000), A joint study conducted with Illinois, Indiana, Kentucky, and Missouri geol. surveys [http://ngmdb.usgs.gov/Prodesc/proddesc_19757.htm]


Summary:

Cambrian (Croixan) Derby Formation occurs on Ozark dome in MO. Correlates with Franconia Formation of Knox Group in IL. Difficult to differentiate Derby from overlying Doe Run Formation, Potosi Dolomite, or Eminence Formation in subsurface.

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


  • Usage in publication:
    • Derby-Doerun Dolomite (usage of Missouri Geological Survey, 1979)
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Ozark uplift
Publication:

GNC Staff, 1999, [U.S. Geologic Names Committee remarks on usage of Derby-Doerun Dolomite]: U.S. Geological Survey, unpublished Geologic Names Committee note


Summary:


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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 ([ ]).