Drakes Formation (KYOd;0)

State	Kentucky
Name	Drakes Formation
Geologic age	Ordovician
Original map label	Od
Comments	in west-central Kentucky, thickness is 0-55 m.
Primary rock type	dolostone (dolomite)
Secondary rock type	shale
Other rock types	limestone
Lithologic constituents	Major Sedimentary > Carbonate > Dolostonelithologies and lithology percentages estimated from stratigraphic column on paper source map; collectively these units are about 80% dolostone (dolomite) (some of it silty),10% limestone, and 10% shale Minor Sedimentary > Clastic > Mudstone > Shalelithologies and lithology percentages estimated from stratigraphic column on paper source map; collectively these units are about 80% dolostone (dolomite) (some of it silty),10% limestone, and 10% shale Sedimentary > Carbonate > Limestonelithologies and lithology percentages estimated from stratigraphic column on paper source map; collectively these units are about 80% dolostone (dolomite) (some of it silty),10% limestone, and 10% shale
Map references	Noger, M.C., compiler, 1988, Geologic map of Kentucky: sesquicenntennial edition of the Kentucky Geological Survey: U.S. Geological Survey and the Kentucky Geological Survey, scale 1:500,000.
Unit references	Noger, M.C., compiler, 1988, Geologic map of Kentucky: sesquicenntennial edition of the Kentucky Geological Survey: U.S. Geological Survey and the Kentucky Geological Survey, scale 1:500,000.
Geographic coverage	Bullitt - Carroll - Casey - Clark - Estill - Fleming - Garrard - Henry - Jefferson - Lewis - Lincoln - Madison - Marion - Mason - Montgomery - Nelson - Oldham - Powell - Shelby - Spencer - Trimble - Washington