The Statenville Formation is a geological formation of northern Florida

Florida

Florida is a state in the southeastern United States, located on the nation's Atlantic and Gulf coasts. It is bordered to the west by the Gulf of Mexico, to the north by Alabama and Georgia and to the east by the Atlantic Ocean. With a population of 18,801,310 as measured by the 2010 census, it...

, USA.

Age

Period: Neogene

Neogene

The Neogene is a geologic period and system in the International Commission on Stratigraphy Geologic Timescale starting 23.03 ± 0.05 million years ago and ending 2.588 million years ago...

Epoch

Epoch (geology)

An epoch is a subdivision of the geologic timescale based on rock layering. In order, the higher subdivisions are periods, eras and eons. We are currently living in the Holocene epoch...

: Miocene

Miocene

The Miocene is a geological epoch of the Neogene Period and extends from about . The Miocene was named by Sir Charles Lyell. Its name comes from the Greek words and and means "less recent" because it has 18% fewer modern sea invertebrates than the Pliocene. The Miocene follows the Oligocene...

Faunal stage

Faunal stage

In chronostratigraphy, a stage is a succession of rock strata laid down in a single age on the geologic timescale, which usually represents millions of years of deposition. A given stage of rock and the corresponding age of time will by convention have the same name, and the same boundaries.Rock...

: Chattian

Chattian

The Chattian is, in the geologic timescale, the youngest of two ages or upper of two stages of the Oligocene epoch/series. It spans the time between and . The Chattian is preceded by the Rupelian and is followed by the Aquitanian .-Stratigraphic definition:The Chattian was introduced by Austrian...

 through early Blancan

Blancan

The Blancan North American Stage on the geologic timescale is the North American faunal stage according to the North American Land Mammal Ages chronology , typically set from 4,750,000 to 1,808,000 years BP, a period of .. It is usually considered to start in the early-mid Pliocene epoch and end...

 ~28.4 to ~2.588 mya, calculates to a period of

Location

The Statenville Formation is found in Hamilton

Hamilton County, Florida

Hamilton County is a county located in the U.S. state of Florida. As of 2000, the population was 13,327. The U.S. Census Bureau 2005 estimate for the county is 13,983 . Its county seat is Jasper, Florida.- History :...

, Columbia

Columbia County, Florida

Columbia County is a county located in the U.S. state of Florida. As of 2000, the population was 56,513. The U.S. Census Bureau 2005 estimate for the county is 64,040 . Its county seat is Lake City, Florida....

, and Baker County

Baker County, Florida

Baker County is a county located in the U.S. state of Florida. As of 2000, the population was 22,259. The U.S. Census Bureau 2008 estimate for the county is 26,164 . Its county seat is Macclenny, Florida. While primarily rural, the county is included in the Jacksonville Metropolitan Area.-...

, northeastern flank of the Ocala Platform

Ocala Platform

The Ocala Platform or Ocala Uplift is a geologic formation, a structural high, and a northwest-trending uplift paralleling the Peninsular Arch along the west coast.-Age:Period: NeogeneEpoch: Early Late Oligocene through Pliocene...

.

Composition

It is composed of sand

Sand

Sand is a naturally occurring granular material composed of finely divided rock and mineral particles.The composition of sand is highly variable, depending on the local rock sources and conditions, but the most common constituent of sand in inland continental settings and non-tropical coastal...

s of light gray to light olive gray color which not of great hardness and contains phosphate

Phosphate

A phosphate, an inorganic chemical, is a salt of phosphoric acid. In organic chemistry, a phosphate, or organophosphate, is an ester of phosphoric acid. Organic phosphates are important in biochemistry and biogeochemistry or ecology. Inorganic phosphates are mined to obtain phosphorus for use in...

. The sand is fine to coarse grained with scattered gravel and with minor occurrences of fossils. Clay is yellowish gray to olive gray in color, poorly consolidated and variably sandy containing phosphate. Dolostone

Dolostone

Dolostone or dolomite rock is a sedimentary carbonate rock that contains a high percentage of the mineral dolomite. In old U.S.G.S. publications it was referred to as magnesian limestone. Most dolostone formed as a magnesium replacement of limestone or lime mud prior to lithification. It is...

 is in thin beds of yellowish gray to light orange, poorly to well indurated, sandy, clayey and containing phosphate grains.

The Statenville Formation partly overlies the Coosawhatchie Formation

Coosawhatchie Formation

The Coosawhatchie Formation is a Miocene geologic formation with an outcrop in North Florida. It is within the Hawthorn Group.-Age:Period: NeogeneEpoch: Miocene ~23.03 to 5.33 mya, calculates to a period of...

. It's permeability is generally low, forming part of the intermediate aquifer

Aquifer

An aquifer is a wet underground layer of water-bearing permeable rock or unconsolidated materials from which groundwater can be usefully extracted using a water well. The study of water flow in aquifers and the characterization of aquifers is called hydrogeology...

system. The phosphate content is of enough quantity to warrant mining.