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Geologic Unit: Rowland
Map showing publication footprint
  • Usage in publication:
    • Rowland Member*
  • Modifications:
    • Named
  • Dominant lithology:
    • Mudstone
  • AAPG geologic province:
    • Cincinnati arch
Publication:

Weir, G.W., Greene, R.C., and Simmons, G.C., 1965, Calloway Creek Limestone and Ashlock and Drakes Formations (Upper Ordovician) in south-central Kentucky, IN Contributions to stratigraphy, 1965: U.S. Geological Survey Bulletin, 1224-D, p. D1-D36.


Summary:

Named lower member of two of Drakes Formation, overlain by Preachersville Member; underlain by Reba Member of Ashlock Formation. Chiefly composed of greenish-gray dolomitic or limy, sparsely glauconitic, silty mudstone. Megafossils absent or very sparse. Ripple marks and mudcracks common. Approximately replaces the Waynesville Formation as used on southeast, south, and west sides of Jessamine dome.

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


Map showing publication footprint
  • Usage in publication:
    • Rowland Member*
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Cincinnati arch
Publication:

Peterson, W.L., 1966, Geologic map of the New Haven quadrangle, Nelson and LaRue Counties, Kentucky: U.S. Geological Survey Geologic Quadrangle Map, GQ-506, 1 sheet, scale 1:24,000 [http://ngmdb.usgs.gov/Prodesc/proddesc_977.htm]


Summary:

Rowland Member of Drakes Formation extended onto west side of Jessamine dome where it is basal member (of three) of Drakes Formation: Rowland Member, Bardstown Member, and Saluda Dolomite Member.

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


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

Swadley, WC, and Gibbons, A.B., 1976, Geologic map of the Campbellsburg quadrangle, north-central Kentucky: U.S. Geological Survey Geologic Quadrangle Map, GQ-1364, 1 sheet, scale 1:24,000 [http://ngmdb.usgs.gov/Prodesc/proddesc_10899.htm]


Summary:

Marble Hill Bed extended into north-central KY from southern IN and assigned to Rowland Member of Drakes Formation.

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


Map showing publication footprint
  • Usage in publication:
    • Rowland Member*
  • 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 Rowland Member of the Drakes Formation in south-central KY consists of grayish-green, sparsely glauconitic, dolomitic or calcareous, silty mudstone with ripple marks and mud cracks. Fossils are very rare to absent. Thickness is 40 to 60 feet. Overlies the Ashlock Formation and underlies the Preachersville Member of the Drakes Formation in the southern and eastern sides of the Lexington dome, and underlies the Bardstown Member of the Drakes on the western side. The environment of deposition is interpreted to be tidal flat. The Rowland is of Late Ordovician (Richmondian) age.

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


Map showing publication footprint
  • Usage in publication:
    • Rowland Member*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Cincinnati arch
Publication:

Frey, R.C., 1995, Middle and Upper Ordovician nautiloid cephalopods of the Cincinnati arch region of Kentucky, Indiana, and Ohio, IN Pojeta, John, Jr., ed., Contributions to the Ordovician paleontology of Kentucky and nearby states: U.S. Geological Survey Professional Paper, 1066-P, p. P1-P126.


Summary:

Age of Rowland Member of Drakes Formation refined to Cincinnatian (Richmondian).

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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