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Ashlock Formation, Grant Lake and Calloway Creek Limestones, and Fairview Formation, undivided

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Ashlock Formation, Grant Lake and Calloway Creek Limestones, and Fairview Formation, undivided
State Kentucky
Name Ashlock Formation, Grant Lake and Calloway Creek Limestones, and Fairview Formation, undivided
Geologic age Ordovician
Lithologic constituents
Major
Sedimentary > Carbonate > Limestonelithologies and lithology percentages estimated from stratigraphic column on paper source map; collectively these units are about 85% limestone (much of it nodular), 10% shale, and <5% siltstone
Minor
Sedimentary > Clastic > Mudstone > Shalelithologies and lithology percentages estimated from stratigraphic column on paper source map; collectively these units are about 85% limestone (much of it nodular), 10% shale, and <5% siltstone
Incidental
Sedimentary > Clastic > Siltstonelithologies and lithology percentages estimated from stratigraphic column on paper source map; collectively these units are about 85% limestone (much of it nodular), 10% shale, and <5% siltstone
Comments in west-central Kentucky, collectively the thickness ranges from 65-225 m; in north-central Kentucky, collectively the thickness ranges from 21-45 m; in northeastern Kentucky, collectively the thickness ranges from 45-75 m; and in east-central Kentucky, collectively the thickness ranges from 30-90 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 - Boone - Bourbon - Boyle - Bracken - Bullitt - Campbell - Carroll - Casey - Clark - Fleming - Franklin - Gallatin - Garrard - Grant - Henry - Jefferson - Jessamine - Kenton - Lewis - Lincoln - Madison - Marion - Mason - Montgomery - Nelson - Nicholas - Owen - Pendleton - Robertson - Shelby - Spencer - Trimble - Washington