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Soils- The soils of Indian River County are separated into five general landscape groups. These are the soils of the sand ridges, coastal island and tidal marshes, flatwoods, sloughs, and freshwater swamps and marshes. The soils of the sand ridges consist of nearly level to gently sloping, excessively drained and moderately well drained soils in high dunelike areas on the Atlantic Coastal Ridge along U.S. Highway 1 and extends in a north -south direction from Brevard County to Saint Lucie County. These soils are sandy throughout to a depth of eighty inches or more. Soils of the largest extent in this area are Astatula, Archbold, and Saint Lucie. The soils of coastal islands consist of nearly level to gently sloping, poorly drained to excessively drained soils on low, gently undulating dunelike ridges, on elongated sloughs, on the higher dunelike ridges of the barrier island, and on islands and mangrove tidal swamps. These soils are sandy throughout and contain shell.fragments. The tidal marshes consist of level, very poorly drained soils that formed in loamy or clayey tidal deposits that have very low soil strength. The soil of the coastal island and tidal marshes are in the eastern part of the county. Soils of the largest extent in this area are Canaveral, Captiva, Palm Beach, McKee, and St. Augustine. The soils of the flatwoods consist of nearly level, poorly drained and somewhat poorly drained soils in broad areas of the flatwoods mostly in.the eastern and extreme western parts of the CODING: Words in W1609ft4tA type are deletions from existing law. Words underlined are additions.