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The Crab Orchard Formation is a geologic formation in Kentucky, United States. It dates back to the Telychian to Aeronian stages of the Silurian period.^[1]

References

^ The Silurian of central Kentucky, U.S.A.: Stratigraphy, palaeoenvironments and palaeoecology

Further reading

Contributions to the Geology of Kentucky: Silurian System

Chronostratigraphy of Kentucky

Viséan	Paoli Formation

Upper	New Albany Shale Ohio Shale Chattanooga Shale
Middle	Sellersburg Limestone Jeffersonville Limestone Boyle Formation
Lower	Clear Creek Formation Back Bone Formation Grassy Knob Formation Flat Gap Formation Onondaga Limestone Oriskany Formation Helderburg Group

Ludfordian	Louisville Limestone
Gorstian	Louisville Limestone

Homerian	Laurel Formation Louisville Limestone Waldron Shale
Sheinwoodian	Bisher Formation Laurel Formation Osgood Formation

Telychian	Alger Shale Brassfield Formation Crab Orchard Formation Drowning Creek Formation Noland Formation Osgood Formation
Aeronian	Brassfield Formation Crab Orchard Formation Drowning Creek Formation Noland Formation
Rhuddanian	Brassfield Formation Drowning Creek Formation

Katian	Kope Formation Lexington Limestone
Sandbian	Lexington Limestone Tyrone Formation

Maquoketa Shale

Darriwilian	St. Peter Sandstone Wells Creek Formation

Tremadocian	Gunter Sandstone

Paibian	Eau Claire Formation Mt. Simon Sandstone