Crab Orchard Formation

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

Crab Orchard Formation Stratigraphic range: Telychian-Aeronian 440–435 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Formation
Underlies	Bisher Formation
Overlies	Brassfield Formation
Location
Region	Kentucky
Country	United States

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

Ludfordian	Louisville Limestone
Gorstian	Louisville Limestone

Wenlock

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

Upper

Katian	Kope Formation Lexington Limestone
Sandbian	Lexington Limestone Tyrone Formation

Maquoketa Shale

Middle

Darriwilian	St. Peter Sandstone Wells Creek Formation

Lower

Tremadocian	Gunter Sandstone

Paibian	Eau Claire Formation Mt. Simon Sandstone

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