Torreya Formation

Torreya Formation Stratigraphic range: Miocene
Type	Geological formation
Unit of	Hawthorn Group
Sub-units	Dogtown, Sopchoppy
Underlies	St. Marks Formation, Suwanee Limestone
Location
Region	North Florida
Country	United States
Type section
Named for	Torreya tree

The Torreya Formation is a Miocene geologic formation with an outcrop in North Florida. It is within the Hawthorn Group.

Period: Neogene
Epoch: Early Miocene
Faunal stage: Aquitanian through early Messinian ~19—15.3 mya, calculates to a period of 3.7 million years

The Torreya Formation is exposed or near the surface from Gadsden County, Florida on the west. Its eastern extent is western-most Hamilton County, Florida. It includes the counties of Liberty, Leon, Jefferson, Madison, and Wakulla. It is informally subdivided into a lower carbonate unit and an upper siliciclastic unit. The majority of Torreya Formation outcrops expose the siliciclastic part of the unit.

The siliciclastics are quartz and vary in color from white to light olive gray. They are unconsolidated to poorly indurated (hard), slightly clayey sands with minor phosphate to light gray to bluish gray, poorly consolidated, variably silty clay (Dogtown Member). The siliciclastics are sporadically fossiliferous and often contain oyster shells as found in the Seaboard Air Line Railroad site.

...
Wikipedia