State | Florida |
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Name | Hawthorn Group, Peace River Formation, Bone Valley Member |
Geologic age | Miocene/Pliocene |
Lithologic constituents |
Major
Unconsolidated > Fine-detrital > ClayThe lithology is highly variable, ranging from sandy, silty, phosphatic clays and relatively pure clays to clayey, phosphatic sands to sandy, clayey phosphorites. In general, consolidation is poor and colors range from white, light brown and yellowish gray to olive gray and blue green.
Unconsolidated > Coarse-detrital > SandThe lithology is highly variable, ranging from sandy, silty, phosphatic clays and relatively pure clays to clayey, phosphatic sands to sandy, clayey phosphorites. In general, consolidation is poor and colors range from white, light brown and yellowish gray to olive gray and blue green.
Sedimentary > Chemical > PhosphoriteClastic unit consisting of sand-sized and larger phosphate grains in a matrix of quartz sand, silt and clay. The lithology is highly variable, ranging from sandy, silty, phosphatic clays and relatively pure clays to clayey, phosphatic sands to sandy, clayey phosphorites (Webb and Crissinger, 1983). In general, consolidation is poor and colors range from white, light brown and yellowish gray to olive gray and blue green. The Bone Valley Member is an extremely important, unique phosphate deposit and has provided much of the phosphate production in the United States during the twentieth century. Mining of phosphate in the outcrop area began in 1888 (Cathcart, 1985) and continues to the present.
Minor
Unconsolidated > Fine-detrital > SiltThe lithology is highly variable, ranging from sandy, silty, phosphatic clays and relatively pure clays to clayey, phosphatic sands to sandy, clayey phosphorites. In general, consolidation is poor and colors range from white, light brown and yellowish gray to olive gray and blue green.
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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.Matson, G.C. and Clapp, F.G., 1909, A preliminary report on the geology of Florida: Florida Geological Survey Second Annual Report, p. 23-173, 1 plate.Webb, S.D., and Crissinger, D.B., 1983, Stratigraphy and vertebrate paleontology of the central and southern Phosphate District of Florida: in Central Florida Phosphate District, Geological Society of America, Southeast Section Field Trip Guidebook, p. 28-72.Cathcart, J.B., 1985, Economic geology of the Land-Pebble Phosphate District of Florida and its southern extension: in Cathcart, J.B., and Scott, T.M., eds., Florida Land-Pebble Phosphate District: Geological Society of America Annual Meeting, Orlando, Florida, field trip guidebook, p. 4-27. |
NGMDB product | |
Counties | Hardee - Hillsborough - Manatee - Polk |