OPEN FILE REPORT NO. 80


Wabasso beds of the Peace River Formation were not recognized at or near land surface and do
not appear on the geologic map.

 Tht Torreya Formation The Torreya Formation is exposed or near the surface from
western Gadsden County eastward to western-most Hamilton County. It is informally
subdivided into a lower carbonate unit and an upper siliciclastic unit (Scott, 1988). The majority
of Torreya Formation outcrops expose the siliciclastic part of the unit. The carbonate sediments
are white to light olive gray, generally poorly indurated, variably sandy and clayey, fossiliferous
(molds and casts) limestone (mudstone and wackestone). The limestones often grade into
calcareous-cemented sands. Phosphate is present in the carbonate sediments, particularly in the
Sopchoppy Member. The siliciclastics vary from white to light olive gray, unconsolidated to
poorly indurated, slightly clayey sands with minor phosphate to light gray to bluish gray, poorly
consolidated, variably silty clay (Dogtown Member). The siliciclastics are sporadically
fossiliferous. The Torreya Formation overlies the FAS and forms part of the intermediate
confining unit/aquifer system.

 The Coosawhatchie Formation The Coosawhatchie Formation is exposed or lies
beneath a thin overburden on the eastern flank of the Ocala Platform from southern Columbia
County to southern Marion County. Within the outcrop region, the Coosawhatchie Formation
varies from a light gray to olive gray, poorly consolidated, variably clayey and phosphatic sand
with few fossils, to an olive gray, poorly to moderately consolidated, slightly sandy, silty clay
with few to no fossils. Occasionally the sands will contain a dolomitic component and, rarely,
the dominant lithology will be dolostone or limestone. Silicified nodules are often present in the
Coosawhatchie Formation sediments in the outcrop region. The sediment may contain 20
percent or more phosphate (Scott, 1988). Permeability of the Coosawhatchie sediments is
generally low, forming part of the intermediate confining unit/aquifer system.

 Thcc Coosawhatchie Formation, Charlton Member The Charlton Member (originally
the Charlton formation, Veatch and Stevenson, 1911), crops out only in northern Nassau County
near and along the St. Marys River. The Charlton Member in this area consists primarily of light
gray to greenish gray, poorly to moderately consolidated, dolomitic to calcareous, silty, sandy,
locally fossiliferous clays. Few carbonate beds occur.

 Ths Statenville Formation The Statenville Formation occurs at or near the surface in a
limited area of Hamilton, Columbia and Baker Counties on the northeastern flank of the Ocala
Platform. The formation consists of interbedded sands, clays and dolostones with common to
very abundant phosphate grains. The sands predominate and are light gray to light olive gray,
poorly indurated, phosphatic, fine to coarse grained with scattered gravel and with minor
occurrences of fossils. Clays are yellowish gray to olive gray, poorly consolidated, variably
sandy and phosphatic, and variably dolomitic. The dolostones, which occur as thin beds, are
yellowish gray to light orange, poorly to well indurated, sandy, clayey and phosphatic with
scattered mollusk molds and casts. Phosphate occurs in the Statenville Formation in
economically important amounts. Silicified fossils and opalized claystones are found in the
Statenville Formation. Permeability of these sediments is generally low, forming part of the
intermediate confining unit/aquifer system.