A PRELIMINARY REPORT ON CLAYS OF FLORIDA 107


 CHAPTER VII
 GEOLOGY OF THE CLAYS OF FLORIDA

 STRATIGRAPHY
 The formations exposed at the surface in Florida are all of the younger periods, ranging from Eocene to Recent, as may be seen from the accompanying table. Each period of the territory is represented and each contains clay to a greater or less extent.

 TABLE OF GEOLOGIC FORMATIONS IN FLORIDA

 ERA PERIOD FORMATION THICK- LITHOLOGIC RENESS DESCRIPTION MARKS
 Recent Recent ? Sands and Clays
 Palm Beach Limestone ? Marine Limestone
 Miami Oolitic Limestone ? Marine Limestone .
 lo Key Largo Limestone ? Marine Limestone
 Key West Limestone ? Marine Limestone
 Lostmans River Limestone ? Marine Limestone
 r
 Fort Thompson Beds ? Freshwater and I
 Marine Beds
 Lafayette Formation ? Sands, Gravels
 and Clavs 3
 Citronelle Formation ? Sands, Gravels 1 0
 and Clays
 Pliocene Bone Valley Formation ?-100' Pebble Phosphate,
 Gravel, Clay,
 Sand
 Alachua Clay Formation 100+ Non-Marine Clays U
 Caloosahatchee Formation 0-100' Marine Marls Nashua Marl Formation 0-100' Marine Marls
 Charlton Marl Formation ? Marine Marls
 Choctawhatchee Formation 20'-50' Chiefly Marls ConH ___________ }ternJacksonville Formation ? Limestone, Clay DoraMiocene Alum Bluff Formation 100'-200' Sand, Gravel, neouB
 Clay, Limestone,
 Fuller's Earth
 Tampa Formation ? Limestone, Clay ConOligocene Chattahoochee Formation 100'-200' Impure Limestone, temClay J44Marianna Formation 30+ Limestone
 Eocene Ocala-Formation 20'-50' Limestone

 EoCENE
 The Eocene is represented by the Ocala formation which is exposed chiefly on the western side of peninsular Florida from Pasco to Lafayette counties and also in the northwestern portion of the State in Jackson