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Jeffersonville Limestone
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Jeffersonville Limestone : ウィキペディア英語版
Jeffersonville Limestone

The Devonian Jeffersonville Limestone is a mapped bedrock unit in Indiana and Kentucky. It is highly fossiliferous.
==Description==
The Jeffersonville is a coarse grained, dark gray, thick bedded, fossiliferous limestone.〔Butts, Charles, 1915, Geology and mineral resources of Jefferson County, Kentucky: Kentucky Geological Survey (), 4th series, v. 3, pt. 2, 270 p.〕
R. D. Perkins (1963) divided the Jeffersonville into five zones based on petrology and fossil content,〔Ronald D. Perkins, 1963, Petrology of the Jeffersonville Limestone (Middle Devonian) of Southeastern Indiana: Geological Society of America Bulletin (1963), 74(11):1335-1354 (abstract )〕 and these are summarized below (in stratigraphic order):
* ''Paraspirifer acuminatus'' zone (top)
* fenestrate bryozoan-brachiopod zone
* ''Brevispirifer gregarius'' zone
* ''Amphipora''-zone
* Coral zone (base, overlies Geneva Dolomite or Louisville Limestone)

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