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Geologic Unit: Tumbez
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Map showing publication footprint
  • Usage in publication:
    • Tumbez limestone
  • Modifications:
    • Named
  • Dominant lithology:
    • Limestone
  • AAPG geologic province:
    • Appalachian basin
Publication:

Cooper, B.N., 1945, Industrial limestones and dolomites in Virginia; Clinch Valley district: Virginia Geological Survey Bulletin, no. 66, 259 p.


Summary:

Named the Tumbez limestone for Tumbez, Russell Co., southwestern VA. Name was proposed for limestone equivalent to the typical Blackford formation in Russell Co.; shaly dolomitic beds of the Blackford are replaced by predominantly coarse-grained limestone of the Tumbez. Interbedded lithologies are exposed at the type locality. Thickness of the Tumbez is 120 feet. Unit overlies the "Knox" dolomite and underlies the Elway limestone. The Tumbez is of Middle Ordovician age.

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


Map showing publication footprint
  • Usage in publication:
    • Tumbez Formation
  • Modifications:
    • Areal extent
    • Revised
  • AAPG geologic province:
    • Appalachian basin
Publication:

Cooper, G.A., 1976, Early Middle Ordovician of the United States, IN Bassett, M.G., ed., The Ordovician System; proceedings of the Paleontological Association symposium: Cardiff, UK, University of Wales Press, Paleontological Association Symposium, Birmingham, England, UK, September 18-20, 1974, p. 171-194., Prepared in cooperation with Natl. Mus. Wales


Summary:

Geographically extended the Tumbez to eastern TN and revised it to the Tumbez Formation. Lithology is mentioned to be a lime-sand.

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


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

Asterisk (*) indicates published by U.S. Geological Survey authors.

"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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).

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