. MacArthur Causeway Downtown and South Beach 1920 1970 2,236,645 49.4% Wet prairies are slightly elevated like sawgrass marshes but with greater plant diversity the surface is covered in water only three to seven months of the year and the water is on average shallow at only 4 inches (10 cm) deep When flooded the marl can support a variety of water plants Solution holes or deep pits where the limestone has worn away may remain flooded even when the prairies are dry and they support aquatic invertebrates such as crayfish and snails and larval amphibians which feed young wading birds These regions tend to border between sloughs and sawgrass marshes! .
. Fluctuating sea levels compressed numerous layers of calcium carbonate sand and shells the resulting permeable limestone formations that developed between 25 million and 70 million years ago created the Floridan Aquifer which serves as the main source of fresh water for the northern portion of Florida However this aquifer lies beneath thousands of feet of impermeable sedimentary rock from Lake Okeechobee to the southern tip of the peninsula. .
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