The Avon Park Formation is composed of cream to light-brown or tan, Middle Eocene, fossiliferous marine limestone interbedded with dolostone. In a few areas of west-central Florida, molds of evaporites may be present in the dolostone. The Avon Park Formation occurs throughout the Florida peninsula and the eastern panhandle. It comprises the oldest rock cropping out in Florida. These sediments are locally exposed in sinks and quarries near the crest of the Ocala Platform in Citrus and Levy Counties. Avon Park fossils include mollusks, foraminifera, echinoids, algae, and carbonized plant remains.