Arcadia Formation

Arcadia Formation Stratigraphic range: Miocene
Type	Geological formation
Unit of	Hawthorn Group
Sub-units	Tampa Member
Overlies	Ocala Limestone and Avon Park Formation
Thickness	600 feet
Lithology
Primary	limestones, dolostone, sand, clay
Location
Region	Central Florida
Country	United States
Extent	Pasco-Sarasota counties
Type section
Named for	Arcadia, Florida
Named by	T. M. Scott, 1988

The Arcadia Formation and its sub-unit, the Tampa Member, are Late Oligocene geologic formations in North Florida, United States. It is part of the Hawthorn Group.

Period: Paleogene to Neogene
Epoch: Early Late Oligocene through Pliocene
Faunal stage: Chattian through early Blancan ~28.4 to ~2.588 mya, calculates to a period of 25.512 million years

The Arcadia Formation and Tampa Member is located southwestern flank of the Ocala Platform from Pasco County and southward in to Hillsborough and Sarasota County, Florida. The Tampa Member and the lower part of the Arcadia Formation form the upper part of the Floridan Aquifer system in parts of southern Florida.

The Arcadia Formation is composed of limestones and dolostones which are yellowish gray to light olive gray to light brown in color. The texture is micro to finely crystalline with varying sandy, clayey limestones and dolostones containing phosphate. The clays are yellowish gray to light olive gray in color. They are moderately hard as well as sandy, silty, phosphatic and dolomitic. Silicified carbonates and opalized claystone have also been found.

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