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Anastasia Formation

Anastasia Formation - The Atlantic Coastal Ridge is underlain by the Anastasia Formation from St. Johns County southward to Palm Beach County. Excellent exposures occur in Flagler County in Washington Oaks State Park, in Martin County at the House of Refuge on Hutchinson Island and at Blowing Rocks in Palm Beach County. An impressive exposure of Anastasia Formation sediments occurs along Country Club Road in Palm Beach County (Lovejoy, 1992). The Anastasia Formation generally is recognized near the coast but extends inland as much as 20 miles (32 kilometers) in St. Lucie and Martin Counties. The Anastasia Formation, named by Sellards (1912),is composed of interbedded sands and coquinoid limestones. The most recognized facies of the Anastasia sediments is an orangish brown, unindurated to moderately indurated, coquina of whole and fragmented mollusk shells in a matrix of sand often cemented by sparry calcite. Sands occur as light gray to tan and orangish brown, unconsolidated to moderately indurated, unfossiliferous to very fossiliferous beds. The Anastasia Formation forms part of the surficial aquifer system.
State Florida
Name Anastasia Formation
Geologic age Pleistocene
Primary rock type calcarenite
Secondary rock type sand
Other rock types limestone
Lithologic constituents
Major
Unconsolidated > Coarse-detrital > SandSands occur as light gray to tan and orangish brown, unconsolidated to moderately indurated, unfossiliferous to very fossiliferous beds.
Sedimentary > Carbonate > LimestoneThe Anastasia Formation, named by Sellards (1912), is composed of interbedded sands and coquinoid limestones. The most recognized facies of the Anastasia sediments is an orangish brown, unindurated to moderately indurated, coquina of whole and fragmented mollusk shells in a matrix of sand often cemented by sparry calcite.
Map references
Scott, T. M., Campbell, K. M., Rupert, F. R., Arthur, J. D., Missimer, T. M., Lloyd, J. M., Yon, J. W., and Duncan, J. G., 2001, Geologic Map of the State of Florida, Florida Geological Survey & Florida Department of Environmental Protection, Map Series 146.
Unit references
Scott, T. M., Campbell, K. M., Rupert, F. R., Arthur, J. D., Missimer, T. M., Lloyd, J. M., Yon, J. W., and Duncan, J. G., 2001, Geologic Map of the State of Florida, Florida Geological Survey & Florida Department of Environmental Protection, Map Series 146.
Scott, Thomas M. P.G. #99, Text to Accompany the Geologic Map of Florida, Open-file Report 80, Florida Geological Survey, 2001.
Lovejoy, D. W., 1992, Classic exposures of the Anastasia Formation in Martin and Palm Beach Counties, Florida: Guidebook for combined Southeastern Geological Society and Miami Geological Society field trip, 31p.
Sellards, E. H., 1912, The soils and other surface residual materials of Florida: Florida Geological Survey Fourth Annual Report, p. 1-79.
Counties Brevard - Broward - Flagler - Indian River - Martin - Palm Beach - Saint Johns - Saint Lucie - Volusia