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Lake Tulane
Lake Tulane in Florida is one of numerous natural lakes that occupy sinkholes, which were formed by the dissolution of Eocene limestone at depth. Lake Wales Ridge, within which Tulane Lake lies, is a linear highland that consists of unconsolidated quartz sands of the Pliocene Cypresshead Formation. These sands rest upon impermeable Miocene sediments that overlie limestone, which was dissolved by groundwater and collapsed to form Tulane Lake. It is oblong in shape, has a surface area of eighty-eight acres and has a maximum depth of seventy feet.〔Beck, B. (1986) ''Sinkholes in Florida: an Introduction.'' Report No. 85-86-4. The Florida Sinkhole Research Institute, University of Central Florida, Orlando, Florida.〕〔Grimm, E.C., G.L. Jacobson, W.A, Watts, B.C.S. Hansen ,and K.A. Maasch (1993) ''A 50,000-Year Record of Climate Oscillations from Florida and Its Temporal Correlation with the Heinrich Events.'' Science. v. 261, no. 5118, pp. 198-200.〕〔White, W.A. (1958) ''Some geomorphic features of central peninsular Florida.'' Geological Bulletin no. 41, Florida Geological Survey, Tallahassee.〕 It is surrounded by residential housing in Avon Park, Florida.
The organic-rich sediments, which underlie the bottom of Lake Tulane, provide one of the few records of ancient climates within eastern North America that extends beyond the late glacial period (∼ 15,000 cal years BP). Cores from the bottom of Lake Tulane have yielded a record of paleoclimates and paleovegetation, which date back to before 60,000 BP. The Pre-Holocene pollen record shows alternating periods of Pinus (pine)-dominated and Quercus-Ambrosia (oak-ragweed)-dominated vegetation. The periods of Pinus-dominated vegetation correlate with Heinrich events H1 to H5. This correlation demonstrates a linkage between continental and oceanic climate events. The periods of Pinus-dominated vegetation are interpreted to represent periods of relatively high precipitation associated with relatively warm waters in the Gulf of Mexico. The periods of Quercus-Ambrosia-dominated vegetation are interpreted to represent period of arid climate associated with periods when the Gulf of Mexico and the North Atlantic Ocean were cooled by glacial meltwaters.〔〔Grimm, E.C., W.A. Watts, G.L. Jacobson Jr., B.C.S. Hansen, H.R. Almquist, and A.C. Dieffenbacher-Krall (2006) ''Evidence for warm wet Heinrich events in Florida.'' Quaternary Science Reviews. vol. 25, pp. 2197–2211.〕
Lake Tulane is used for swimming, boating and fishing. There is a public boat ramp on its west side and a public swimming beach on its south side. A person leaving a comment in the Fishing Works website rated the fishing at the lake as excellent.〔Anonymous (nd) (Fishing Works Website; "Lakes of Highlands County" ) PDF file.〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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