Geology of the County

In Boone County, water is obtained from consolidated sedimentary rocks of Ordovician age, and from unconsolidated sediments of Quaternary age. The oldest rocks found on the surface in Boone County are from the Kope Formation, deposited in shallow seas 490 million years ago during the Late Ordovician Period. In the Late Ordovician, the seas became relatively shallow, as indicated by the amounts of mud (shale) in the sediments. When the waters were clear and warm, a profusion of animal life developed, particularly brachiopods and bryozoa. Over the last million years, unconsolidated Quaternary sediments have been deposited along the larger streams and rivers.

Geologic Formations in the County
Unconsolidated deposits
Alluvium (Qa), glacial sediments (Qg)

Interbedded limestones and shales
Bull Fork Formation (Ob)
Grant Lake Limestone/Fairview Formation (Oaf)

Interbedded shales and limestones
Kope Formation (Okc)

For more information, see the definitions of geologic terms and rock descriptions, a geologic map of the county, a summary of the geology of Kentucky, and a discussion of fossils and prehistoric life in Kentucky.

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