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The Lexington Limestone is a prominent geologic formation that constitutes a large part of the late Ordovician bedrock of the inner Bluegrass region in Kentucky. Named after the city of Lexington , the geologic formation has heavily influenced both the surface topography and economy of the region.
The Lexington Limestone, which covers most of this area, is composed of interbedded shales and thin limestones. Erosion of these lithologies usually form gentle to moderate slopes. However, the Kentucky River Fault system, part of which runs along the Palisades, provides another controlling factor. Movement along the fault has been largely ...
The Camp Nelson Limestone along the Kentucky River gorge between Frankfort and Boonesboro dates to the Middle Ordovician and is the oldest rock exposed at the surface in the state. Additional mudstone and shale formation from the Late Ordovician indicates a shift to a shallower sea, which supported extensive marine life.
Geological map of Mammoth Cave National Park, incl. St. Louis Limestone Outcrops of the St. Louis Limestone near Frenchburg, Kentucky. The St. Louis Limestone is a large geologic formation covering a wide area of the midwest of the United States. It is named after an exposure at St. Louis, Missouri.
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The Menard Limestone is a geologic formation in the Illinois Basin of southern Illinois, southwestern Indiana, and western Kentucky. The type section of both the Walche Limestone Member and the Scottsburg Limestone Member are exposures in Walche's Cut, a railway cutting on the Illinois Central Railroad .
The Kope Formation is one of the three component bedrock formations of the Maquoketa Group that primarily consists of shale (75%) with some limestone (25%) interbedded. In general, it has a bluish-gray color that weathers light gray to yellowish-gray and it occurs in northern Kentucky, southwest Ohio, and southeast Indiana, United States.
The Jeffersonville is a coarse grained, dark gray, thick bedded, fossiliferous limestone. [2]R. D. Perkins (1963) divided the Jeffersonville into five zones based on petrology and fossil content, [4] and these are summarized below (in stratigraphic order):