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Geologic Unit: Bigby
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Map showing publication footprint
  • Usage in publication:
    • Bigby limestone*
  • Modifications:
    • Named
  • Dominant lithology:
    • Limestone
  • AAPG geologic province:
    • Cincinnati arch
Publication:

Hayes, C.W., and Ulrich, E.O., 1903, Columbia folio, Tennessee: U.S. Geological Survey Geologic Atlas of the United States Folio, GF-95, 6 p., scale 1:125,000


Summary:

Bigby limestone named in this report for exposures on Big Bigby Creek, Maury Co., central TN. Unit is generally nearly uniform, semi-oolitic or granular crystalline, laminated, phosphatic limestone of gray or bluish color. Upper part often shaly or arenaceous. Lower part frequently having beds of shale but never sandy. Thickness 30 to 100 ft. Of Trenton age. Unconformably underlies Catheys formation and overlies Hermitage formation, both of Trenton age.

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


Map showing publication footprint
  • Usage in publication:
    • Bigby limestone*
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Cincinnati arch
Publication:

Ulrich, E.O., 1924, Classified and correlated lower Paleozoic formations in east and central Tennessee, IN Gordon, C.H., Marble deposits of east Tennessee; Part 1, History, occurrence and distribution: Tennessee Division of Geology Bulletin, no. 28, p. 34.


Summary:

Pg. 34, and C. Butts, 1926 (Alabama Geol. Survey Spec. Rpt., no. 14, chart opp. p. 80). Bigby limestone. Shows Cannon limestone of Tennessee as underlying Catheys limestone and overlying Bigby limestone. This is present [ca. 1938] accepted definition of Bigby limestone, which lies unconformably on Hermitage formation.

Source: US geologic names lexicon (USGS Bull. 896, p. 182).


Map showing publication footprint
  • Usage in publication:
    • Bigby-Cannon limestone
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Cincinnati arch
Publication:

Wilson, C.W., Jr., 1949, Pre-Chattanooga stratigraphy of central Tennessee: Tennessee Division of Geology Bulletin, no. 56, 407 p., 2nd ed. (1990) incl. editorial revisions


Summary:

Pg. 2 (fig. 1), 80, 107-121. Bigby limestone grades laterally into Cannon limestone. The two are contemporary facies of unit here termed Bigby-Cannon limestone which overlies Hermitage formation and underlies Catheys formation. All included in Nashville group. [Age is Middle Ordovician.]

Source: US geologic names lexicon (USGS Bull. 1200, p. 329).


Map showing publication footprint
  • Usage in publication:
    • Bigby Limestone*
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Cincinnati arch
Publication:

Clark, S.H.B., Spanski, G.T., Hadley, D.G., and Hofstra, A.H., 1993, Geology and mineral resource potential of the Chattanooga 1 degree x 2 degrees quadrangle, Tennessee and North Carolina; a preliminary assessment: U.S. Geological Survey Bulletin, 2005, 35 p.


Summary:

Nashville Group, consisting of Catheys Formation, Bigby and Cannon Limestones, and Hermitage Formation, is mapped undivided. Age of Bigby is Middle Ordovician. Bigby correlates with Cannon.

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


Map showing publication footprint
  • Usage in publication:
    • Bigby Limestone*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Cincinnati arch

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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 ([ ]).