Sturgis Formation (KYPAs;0)

State	Kentucky
Name	Sturgis Formation
Geologic age	Middle to Upper Pennsylvanian
Original map label	PAs
Comments	in western Kentucky, thickness is 678 m
Primary rock type	siltstone
Secondary rock type	sandstone
Other rock types	shale; limestone; coal
Lithologic constituents	Major Sedimentary > Clastic > Siltstonelithologies and lithology percentages estimated from stratigraphic column on paper source map; collectively these units are about 60% siltstone, 20 % sandstone, 20% shale, and incidental limestone and coal. Minor Sedimentary > Clastic > Mudstone > Shalelithologies and lithology percentages estimated from stratigraphic column on paper source map; collectively these units are about 60% siltstone, 20 % sandstone, 20% shale, and incidental limestone and coal. Sedimentary > Clastic > Sandstonelithologies and lithology percentages estimated from stratigraphic column on paper source map; collectively these units are about 60% siltstone, 20 % sandstone, 20% shale, and incidental limestone and coal. Incidental Sedimentary > Carbonate > Limestonelithologies and lithology percentages estimated from stratigraphic column on paper source map; collectively these units are about 60% siltstone, 20 % sandstone, 20% shale, and incidental limestone and coal. Sedimentary > Coallithologies and lithology percentages estimated from stratigraphic column on paper source map; collectively these units are about 60% siltstone, 20 % sandstone, 20% shale, and incidental limestone and coal.
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	Daviess - Henderson - Hopkins - McLean - Muhlenberg - Ohio - Union - Webster