Avon Park Formation Stratigraphic range: Eocene | |
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![]() Packstone from a dredge pile by the Cross Florida Barge Canal | |
Type | Geological formation |
Sub-units | None |
Underlies | Ocala Limestone (in part) |
Lithology | |
Primary | Grainstone, packstone, wackestone |
Other | Mudstone |
Location | |
Region | Central Florida |
Country | ![]() |
Extent | Citrus and Levy County |
Type section | |
Named for | Avon Park, Florida |
Named by | Applin & Applin 1944 |
The Avon Park Formation is a Middle Eocene geologic formation and is the oldest exposed sediments in Florida, United States.
Period : Paleogene
Epoch : Middle Eocene~55.8 to 33.9 mya, calculates to a period of 21.9 million years
Faunal stage : Clarkforkian through early Chadronian
The Avon Park formation is located on the crest of the Ocala Platform in Citrus County with three distinct outcroppings. Levy County has one outcropping near the county line with Citrus County.
The Avon Park Formation consists of cream to light-brown or tan, poorly hardened to very hard, grainstone, packstone and wackestone, with rare mudstone. Fossils found throughout but not densely. These limestones are interbedded with vuggy dolomites which are soft to very hard and tan to brown, very fine to medium crystalline structure.
The Avon Park Formation, as with many formations, is part of the Floridan Aquifer system. Parts of the Avon Park Formation comprise important, subregional confining units within that system.
The fossils are in molds and casts and include:
The Green River Formation is an Eocene geologic formation that records the sedimentation in a group of intermountain lakes in three basins along the present-day Green River in Colorado, Wyoming, and Utah. The sediments are deposited in very fine layers, a dark layer during the growing season and a light-hue inorganic layer in the dry season. Each pair of layers is called a varve and represents one year. The sediments of the Green River Formation present a continuous record of six million years. The mean thickness of a varve here is 0.18 mm, with a minimum thickness of 0.014 mm and maximum of 9.8 mm.
The Torreya Formation is a Miocene geologic formation with an outcrop in North Florida. It is within the Hawthorn Group.
The Ocala Limestone is a late Eocene geologic formation of exposed limestones near Ocala, Marion County, Florida.
The Suwannee Limestone is an Early Oligocene geologic formation of exposed limestones in North Florida, United States.
The Chipola Formation is a Late Oligocene to Early Miocene geologic formation in the Florida Panhandle and member of the Alum Bluff Group.
The Peace River Formation is a Late Oligocene to Early Miocene geologic formation in the west-central Florida peninsula.
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The Anastasia Formation is a geologic formation deposited in Florida during the Late Pleistocene epoch.
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The Hoko River Formation is a Late Eocene marine sedimentary geologic formation. The formation is exposed in outcrops along the Strait of Juan de Fuca on the Olympic Peninsula in Washington State, USA. It is known for containing numerous fossils of crabs. It overlies the older Lyre Formation and underlies the younger Makah Formation.
Hydriomena? protrita is an extinct species of moth in the family Geometridae, and possibly in the modern genus Hydriomena. The species is known from late Eocene, Priabonian stage, lake deposits of the Florissant Formation in Teller County, Colorado, United States. It was first described by Theodore Dru Alison Cockerell in 1922.
Neoephemera antiqua is an extinct species of mayfly in the family Neoephemeridae that is known from early Eocene, Ypresian stage, lake deposits near the small community of Republic in Ferry County, Washington, USA.
The Klondike Mountain Formation is an early Eocene geological formation located in the northeast central area of Washington State. The formation, named for the type location designated in 1962, Klondike Mountain north of Republic, Washington, is composed of volcanic rocks in the upper unit and volcanics plus lacustrine (lakebed) sedimentation in which a lagerstätte with exceptionally well-preserved plant and insect fossils has been found, along with fossil epithermal hot springs.
Uintascorpio is an extinct genus of scorpion in the family Buthidae and containing the single species Uintascorpio halandrasorum. The species is known only from the Middle Eocene Parachute Member, part of the Green River Formation, in the Piceance Creek Basin, Garfield County, northwestern Colorado, USA.
Eucommia montana is an extinct species of flowering plant in the family Eucommiaceae. E. montana is known from fossil fruits found in Eocene deposits of the northwestern United States southeastern British Columbia south to Oregon and east to Montana and Colorado. E. montana is one of five described fossil species from North America assigned to the modern genus Eucommia. The other species are E. constans, E. eocenica, E. jeffersonensis, and E. rowlandii.
Paleontology in Florida refers to paleontological research occurring within or conducted by people from the U.S. state of Florida. Florida has a very rich fossil record spanning from the Eocene to recent times. Florida fossils are often very well preserved.
The Kishenehn Formation is a Paleogene stratigraphic unit in Montana. Fossil amiiforme and teleost fish have been found in outcrops of the formation's Coal Creek Member in Glacier National Park. Mosquitos have also been found in the Coal Creek Member, and have been found to be hematophagous. It is considered a Middle Eocene Lagerstätte.
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