State | Florida |
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Name | Hawthorn Group, Coosawhatchie Formation |
Geologic age | Miocene |
Lithologic constituents |
Major
Unconsolidated > Fine-detrital > ClayWithin the outcrop region, the Coosawhatchie Formation varies from a light gray to olive gray, poorly consolidated, variably clayey and phosphatic sand with few fossils, to an olive gray, poorly to moderately consolidated, slightly sandy, silty clay with few to no fossils.
Unconsolidated > Coarse-detrital > SandWithin the outcrop region, the Coosawhatchie Formation varies from a light gray to olive gray, poorly consolidated, variably clayey and phosphatic sand with few fossils, to an olive gray, poorly to moderately consolidated, slightly sandy, silty clay with few to no fossils.
Minor
Unconsolidated > Fine-detrital > SiltWithin the outcrop region, the Coosawhatchie Formation varies from a light gray to olive gray, poorly consolidated, variably clayey and phosphatic sand with few fossils, to an olive gray, poorly to moderately consolidated, slightly sandy, silty clay with few to no fossils.
Incidental
Sedimentary > Carbonate > LimestoneOccasionally the sands will contain a dolomitic component and, rarely, the dominant lithology will be dolostone or limestone.
Sedimentary > Carbonate > DolostoneOccasionally the sands will contain a dolomitic component and, rarely, the dominant lithology will be dolostone or limestone.
Sedimentary > Clastic > Mudstone > Shale > Phosphatic-shaleVariably clayey and phosphatic sand with few fossils, to an olive gray, poorly to moderately consolidated, slightly sandy, silty clay with few to no fossils.
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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, scale 1:750,000.Scott, Thomas M.P.G. #99, Text to Accompany the Geologic Map of Florida, Open-file Report 80, Florida Geological Survey, 2001.Scott, T.M., 1988, The lithostratigraphy of the Hawthorn Group (Miocene) of Florida: Florida Geological Survey Bulletin 59, 148 p. |
NGMDB product | |
Counties | Alachua - Baker - Bradford - Columbia - Lake - Levy - Marion - Orange - Seminole - Union |