| State | Kentucky |
|---|---|
| Name | Crab Orchard Formation and Brassfield Dolomite, undivided |
| Geologic age | Silurian |
| Lithologic constituents | Major
Sedimentary > Carbonate > Dolostonelithologies and lithology percentages estimated from stratigraphic column on paper source map; collectively these units are about 65% shale and 35% dolomite (some cherty)
Sedimentary > Clastic > Mudstone > Shalelithologies and lithology percentages estimated from stratigraphic column on paper source map; collectively these units are about 65% shale and 35% dolomite (some cherty)
|
| Comments | in northeastern Kentucky, thickness is 0-55 m; in east-central Kentucky, thickness is 33-57 m |
| 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. |
| NGMDB product | |
| Counties | Bath - Clark - Estill - Fleming - Garrard - Lewis - Lincoln - Madison - Mason - Montgomery - Powell - Rockcastle - Rowan |