The Marianna Limestone is a Lower Oligocene, white to cream, fossiliferous, variably argillaceous marine limestone occurring in the central panhandle. It is laterally equivalent to the lower portion of the Suwannee Limestone. The Marianna Limestone was once quarried near Marianna, Jackson County, for use as a building stone. Fossils include foraminifera, mollusks, and rare vertebrates.