120 FLORIDA GEOLOGICAL SURVEY-I3TH ANNUAL REPORT

the flatwoods regions described elsewhere in this report; but most of the region is rather hilly, with topography something like that of the lime-sink region but on a larger scale. The highest known elevation in the State is Iron Mountain in Polk County, about 325 feet, and there are probably several other points above 300, though we












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 Fig. 18. Rock Spring, Orange County. The water rushes out audibly from the base of a limestone cliff.about 15 feet high. Feb. 11, 1915.