400 E Kelly Park Rd, Apopka, FL 32712
Hawthorn Group (Coosawhatchie Formation)
The Coosawhatchie Formation of the Hawthorn Group is a Middle Miocene-aged geologic unit composed primarily of phosphatic, clayey sand and sandy clay, often containing significant amounts of dolostone, limestone, and silicified nodules. It is a poorly consolidated, marine sediment unit recognized for its high phosphate content and role as a confining aquifer.
Kelly Park features Miocene-era fossiliferous limestone
The limestone at Kelly Park/Rock Springs is a highly fossiliferous limestone dating back approximately 17 million years. This geological formation is part of a limestone and sand bluff that stands roughly 20 feet high, from which the spring emerges via a partly submerged cavern