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

Safford, J.M., 1869, Geology of Tennessee: Nashville, TN, 550 p.


Summary:

Named Ridley limestone for Judge Ridley's mill, near Old Jefferson, Rutherford Co., TN. Consists of heavy-bedded light-blue or dove-colored fossiliferous limestone, 95 feet thick. It is included in Trenton or Lebanon (Stones River) group. The Ridley underlies the Glade (Lebanon) limestone and overlies the Pierce limestone. It is considered of Early Ordovician age.

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


Map showing publication footprint
  • Usage in publication:
    • Ridley Limestone*
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Appalachian basin

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

Wahlman, G.P., 1992, Middle and Upper Ordovician symmetrical univalved mollusks (Monoplacophora and Bellerophontina) of the Cincinnati arch region, IN Pojeta, John, Jr., ed., Contributions to the Ordovician paleontology of Kentucky and nearby states: U.S. Geological Survey Professional Paper, 1066-O, p. O1-O203.


Summary:

The Ridley Limestone of the Stones River Group in central Tennessee consists of gray to bluish gray and tan, massive bedded, fine and medium grained limestone with dolomitized burrows and chert. Contains brachiopods and bryozoans. Thickness is 90 to 115 feet. Overlies the Pierce Limestone and underlies the Lebanon Limestone, both of the Stones River Group. The Ridley was deposited in a normal marine, subtidal environment.

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


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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 ([ ]).