• Source: Ocala Limestone

The Ocala Limestone is a late Eocene geologic formation of exposed limestones near Ocala, Marion County, Florida.




Age


Period: Paleogene
Epoch: Late Eocene
Faunal stage: Late Clarkforkian through early Orellan
Absolute Age: ~55.8 to ~33.9 mya, calculates to a period of approximately 21.9 million years




Location


The Ocala Limestone is at or near the surface within the Ocala Karst District located in west-central to the northwestern part of the peninsula. It is also within the Dougherty Plain District in the north-central panhandle where it easily forms karsts. These karsts often have several feet (meters) of relief which dramatically influence the topography of the Ocala Karst District and the Dougherty Plain District. The area is abundant with disappearing streams and springs.




Composition


Formerly a geologic group, Ocala Limestone was downgraded to formation status by T.M. Scott in 1991. The Ocala Limestone consists of almost pure limestones with occasional dolomites. It can be subdivided into both lower and upper facies with the lower facies composed of a whitish to cream-colored, fine to medium grained, poorly to moderately hard, fossil rich grainstone and packstone. The upper Ocala is white and somewhat weak and poorly sorted. Its extremely fossil rich grainstone, packstone and wackestone and some chert is common in the upper facies. Its permeable and transmissive properties allow it to form a vital portion of the Floridan Aquifer.




Overlay


The Ocala Limestone overlies the Avon Park Formation and forms part of the Floridan Aquifer System. (USGS)




Fossils


Foraminifers, Lepidocyclina
Echinoids
Bryozoans
Mollusks
Rare vertebrates




References






External links


SOFIA, United States Geological Survey: Florida geology maps

Kata Kunci Pencarian:

• Daftar county dan daerah setingkat county di Amerika Serikat
• Daftar julukan kota di Amerika Serikat
• Ocala Limestone
• Ponce de Leon Springs State Park
• Marion County, Florida
• Silver Springs, Ocala and Gulf Railroad
• Suwannee Limestone
• Henderson Beach State Park
• Orange Island (Florida)
• Hawthorn Group
• Avon Park Formation
• Arcadia Formation