# Ocala Limestone

Canonical page: https://lithomap.app/resources/geologic-formations/united-states/ocala-limestone
Last reviewed: September 17, 2026
Page purpose: Comprehensive United States geologic formation reference for human readers, search systems, and language models.
Major region: Gulf / Atlantic
Regional setting: Florida Platform and southeastern Coastal Plain
Age: Late Eocene
Age detail: Primarily late Eocene; mapped usage and subdivisions vary across the Southeast
Depositional setting: Warm, shallow carbonate shelf
Rock types: Fossiliferous limestone, Chalky limestone, Coquina, Dolostone
States in recognized usage: Alabama, Florida, Georgia, Mississippi, South Carolina

## Summary

The Ocala Limestone is a porous, fossil-rich Eocene carbonate spread across the Florida Platform and adjoining Coastal Plain, central to the region’s karst landscapes and groundwater system.

## Distribution

Ocala rock is exposed in parts of northern and central Florida and occurs beneath younger cover across much of the peninsula and neighboring states. State usage may divide or group the interval differently outside Florida.

Quarries, springs, riverbanks, and sinkholes reveal sections, but surficial sand and clay hide most of its extent. Dissolution produces irregular contacts and cavities rather than consistently flat surfaces.

## Geological history

Foraminifera, mollusks, bryozoans, echinoids, and other organisms supplied carbonate sediment on a warm marine platform. Lime mud and shell debris accumulated far from major river-borne sand sources.

Freshwater later dissolved calcite, enlarging fractures and creating caves, conduits, springs, and sinkholes. Local recrystallization and dolomitization changed the original limestone fabric.

## Fossil record

Large foraminifera, echinoids, mollusks, bryozoans, corals, and other marine fossils are common in many beds. Fossil assemblages have long been used to subdivide and correlate the unit.

Some rock is a mass of visible skeletal grains while fine or recrystallized intervals show fewer recognizable fossils. Preservation differs greatly among quarries and members.

## Minerals and geological resources

Calcite dominates, with dolomite, clay, quartz sand, and phosphate locally present. Weathering may leave residual clay and insoluble sand above solutioned limestone.

The carbonate is part of the Floridan aquifer system and has been quarried for aggregate and lime. High permeability also makes groundwater vulnerable where protective cover is thin.

## Field context

- Sinkholes, submerged cavities, and steep quarry faces are serious hazards.
- Spring and cave access may be restricted for safety, habitat, or water-resource protection.
- Do not infer a stable ground surface from generalized limestone mapping.

## Connected field guides

- Limestone (rock; Named rock type and mineral context) — https://lithomap.app/resources/rock-identification/limestone
- Dolostone (rock; Named rock type) — https://lithomap.app/resources/rock-identification/dolostone
- Calcite (mineral; Mineral discussed in this formation) — https://lithomap.app/resources/mineral-identification/calcite
- Dolomite (mineral; Mineral discussed in this formation) — https://lithomap.app/resources/mineral-identification/dolomite
- Quartz (mineral; Mineral discussed in this formation) — https://lithomap.app/resources/mineral-identification/quartz

Mapped location and formation context support an identification but cannot establish one. Compare several physical properties and use laboratory analysis when the material remains ambiguous.

## Connected state geology guides

- Florida geology — https://lithomap.app/resources/geology/united-states/florida

## Authoritative sources

- Geolex Ocala unit record — U.S. Geological Survey: https://ngmdb.usgs.gov/Geolex/Units/Ocala_3071.html
- Geolex Ocala references — U.S. Geological Survey: https://ngmdb.usgs.gov/Geolex/UnitRefs/OcalaRefs_3071.html

## Formation photograph

- Image: https://lithomap.app/_delivery/formations/ocala-limestone.webp
- Description: Pale fossiliferous Ocala Limestone exposed in Florida
- Creator: Charlie A. Smith
- License: CC BY-SA 3.0 — https://creativecommons.org/licenses/by-sa/3.0/
- Source record: https://commons.wikimedia.org/wiki/File:Ocala_Limestone.jpg

Formation-level information does not prove that a fossil or mineral occurs at a specific coordinate. It also does not establish ownership, access, collecting permission, present conditions, or specimen identity.