Tamiami Formation

The Tamiami Formation is a Late Miocene to Pliocene geologic formation in the southwest Florida peninsula.^[1]

Tamiami Formation
Stratigraphic range: Late Miocene-Late Pliocene ~13.06–2.6 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Fossil (Cerithium dalli) from the Tamiami Formation
Type	Geological formation
Sub-units	Buckingham Limestone Member, Ochopee Limestone Member, Bonita Springs Marl Member, Golden Gate Reef Member, Pinecrest Sand Member
Overlies	Hawthorn Group (see text)
Thickness	50–100 ft (15–30 m)
Lithology
Primary	Sandstone, claystone, limestone
Other	Phosphate
Location
Region	Southwest Florida
Country	United States
Extent	Charlotte-Monroe Counties
Type section
Named for	Tamiami Trail (highway)

Age

Period: Neogene
Epoch: Late Miocene to Pliocene
Faunal stage: Clarendonian through Blancan ~13.06–2.588 mya, calculates to a period of 10.472 million years

Location

Location of Taniami Formation in Florida.

The Tamiami Formation appears in the counties of Charlotte, Lee, Hendry, Collier and Monroe. It is widespread in Florida and part of the intermediate confining aquifer system.^[2] The Tamiami formation overlies the Hawthorn at every locality where the Hawthorn has been penetrated and is overlain unconformably by the Caloosahatchee marl of the Pliocene in Charlotte County.

Composition

The Tamiami Formation contains a wide range of mixed carbonate-siliciclastic lithologies and associated faunas. It occurs at or near the land surface in the southern peninsula with numerous named and unnamed members recognized within the Tamiami Formation. Its unevenness indicates that the upper part has been subjected to erosion.^[3]

Lithologies

The Tamiami Formation includes:

• light gray to tan, unconsolidated, fine to coarse grained sand with fossils
• light gray to green, poorly consolidated, fossil bearing sandy clay to clayey sand
• light gray, poorly consolidated, very fine to medium grained, calcareous, fossil bearing sand
• white to light gray, poorly consolidated, sandy, fossil bearing limestone
• white to light gray, moderately to well hardened, sandy, fossiliferous limestone

Phosphate is present in limited quantities throughout the Tamiami in sand and gravel.

Sub-units

• Bonita Springs Marl Member
• Golden Gate Reef Member
• Ochopee Limestone Member
• Pinecrest Sand Member

Fossils

Fossils appear in casts and molds, as well as original material.

• Barnacles
• Mollusks (Ostrea disparilis, Chione ulocyma, and Turritella pontoni)
• Corals
• Echinoids
• Foraminifers
• Nanoplankton (calcareous)