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Chert and clay, undifferentiated

Chert and clay, undifferentiated in Jackson Purchase
State Kentucky
Name Chert and clay, undifferentiated
Geologic age Lower and Middle Devonian
Comments western Kentucky; thickness is at least 30 m
Primary rock type chert
Secondary rock type clay or mud
Other rock types
Lithologic constituents
Major
Sedimentary > Chemical > Chertlithologies and lithology percentages estimated from stratigraphic column on paper source map: about 50 % chert and 50% clay or mud
Unconsolidated > Fine-detrital > Claylithologies and lithology percentages estimated from stratigraphic column on paper source map; about 50 % chert and 50% clay or mud
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.
Counties Marshall