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Geologic Unit: Drakes
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Map showing publication footprint
  • Usage in publication:
    • Drakes Formation*
  • Modifications:
    • Named
  • Dominant lithology:
    • Limestone
    • Dolomite
  • 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 Drakes Formation. Composed of grayish green dolomite or limy silty mudstone and lesser amounts of argillaceous, fine-grained dolomite or dolomitic limestone. Megafossils absent or sparse in mudstone, some dolomite beds contain abundant poorly preserved bryozoans or brachiopods. Mudstone contains ripplemarks and mudcracks. 135 ft thick at type section. Divided into Rowland and overlying Preachersville Members. Conformably overlies Ashlock Formation; disconformably overlain by Brassfield Dolomite. Assigned to Late Ordovician. Approximately same rocks called the Waynesville limestone and overlying Liberty and Whitewater formations undivided by Palmquist and Hall (1960).

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


Map showing publication footprint
  • Usage in publication:
    • Drakes Formation*
  • 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, scale 1:24,000 [http://ngmdb.usgs.gov/Prodesc/proddesc_977.htm]


Summary:

Drakes Formation geographically extended from southeast-central Kentucky to west-central Kentucky. Saluda Limestone reduced in rank to Saluda Dolomite Member and assigned to Drakes Formation. Drakes consists of Rowland (lowest), unnamed, and Saluda Dolomite Members.

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


Map showing publication footprint
  • Usage in publication:
    • Drakes Formation*
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Cincinnati arch

Map showing publication footprint
  • Usage in publication:
    • Drakes Formation*
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Cincinnati arch

Map showing publication footprint
  • Usage in publication:
    • Drakes Formation*
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Cincinnati arch

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

Weir, G.W., Peterson, W.L., and Swadley, WC, 1984, Lithostratigraphy of Upper Ordovician strata exposed in Kentucky, IN Contributions to the geology of Kentucky: U.S. Geological Survey Professional Paper, 1151-E, p. E1-E121. [Available online from the USGS PubsWarehouse: http://pubs.er.usgs.gov/pubs/pp/pp1151E]


Summary:

Comprehensive description of Drakes Formation in KY. Map shows area of exposure in KY. Discussions of members, stratigraphic relationships, and environments of deposition. Drakes consists of grayish green dolomite, limy mudstone, limy shale, and limestone. Commonly 30 to 100 ft thick. Crops out around Jessamine dome in KY, OH, and IN.

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


Map showing publication footprint
  • Usage in publication:
    • Drakes Formation
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Cincinnati arch
Publication:

Shrake, D.L., Schumacher, G.A., and Swinford, E.M., 1988, Field guidebook to the stratigraphy, sedimentology, and paleontology of the Upper Ordovician Cincinnati Group of southwest Ohio: Ohio Division of Geological Survey, Society of Economic Paleontologists and Mineralogists, 5th Midyear meeting, 81 p.


Summary:

The Geological Survey of Ohio recognizes the Cincinnati Group proposed by Meek and Worthen (1865), but at this time retains it as an informal term. The unit will be formally reinstated as a lithostratigraphic term after revision of its lower boundary and minor lithologic redescription of its units are completed. The ten formations included in the group are the (ascending) Clays Ferry Formation, the Kope Formation, the Fairview Formation, the Miamitown Shale, the Grant Lake Limestone, the Arnheim Formation, the Waynesville Formation, the Liberty Formation, the Whitewater Formation, and the Drakes Formation. Six members have been identified in the course of field mapping: the Point Pleasant Tongue of the Clays Ferry, the informal Bellevue, Corryville, Mount Auburn, and Straight Creek members of the Grant Lake Limestone, and the Preachersville Member of the Drakes Formation. The Backbone Creek and Elk Creek beds are recognized as excellent stratigraphic marker beds.

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


Map showing publication footprint
  • Usage in publication:
    • Drakes Formation*
  • 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 Drakes Formation in south-central KY consists of grayish-green, dolomitic or calcareous, silty mudstone and argillaceous, finely crystalline dolomite or dolomitic limestone. The unit is divided into (ascending) the Rowland and Preachersville Members on the southern and eastern sides of the Lexington Dome, and (ascending) the Rowland, Bardstown, and Saluda Dolomite Members on the western side of the dome. In northwestern KY and southwestern OH, the only part of the Drakes that is exposed is 25 to 30 feet of the Preachersville Member. Thickness of the Drakes is 120 to 150 feet. Overlies (in westward direction) the Ashlock Formation, Grant Lake Limestone, or Bull Fork Formation, and unconformably underlies the Silurian. The Drakes is of Late Ordovician (Richmondian) age.

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


Map showing publication footprint
  • Usage in publication:
    • Drakes
  • Modifications:
    • Not used
  • AAPG geologic province:
    • Cincinnati arch
Publication:

Holland, S.M., 1993, Sequence stratigraphy of a carbonate-clastic ramp; the Cincinnatian Series (Upper Ordovician in its type area): Geological Society of America Bulletin, v. 105, no. 3, p. 306-322.


Summary:

The Cincinnatian Series is divided into five depositional sequences in this report, which correspond to lithostratigraphic units. The following stratigraphic names in KY should be abandoned as they have been applied to bodies of rock already named in downramp areas of OH and IN: Bardstown (=Lower Whitewater), Reba (=Oregonia), Stingy Creek (=Mount Auburn), Calloway Creek (=Bellevue), and Clays Ferry (=Fairview). The following units in KY, OH, and IN lump dissimilar facies and straddle sequence boundaries and therefore should be abandoned: Drakes, Ashlock, Dillsboro, Tanners Creek, and Bull Fork. Grant Lake has been defined in several different ways and consequently should be abandoned. Several units will be redefined at a later date, including the Upper Whitewater and the "Sunset" and "Saluda" of OH and IN. Formal naming of new lithostratigraphic units will follow further study.

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


Map showing publication footprint
  • Usage in publication:
    • Drakes Formation*
  • Modifications:
    • Overview
    • 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:

Rowland, Bardstown, and Preachersville Members of Drakes Formation in KY are used in this report. Age is refined to Cincinnatian (Richmondian).

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


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