. Bulletins of American paleontology. Pollen Zonation: O'Neal et al. 103 al Ridge to the east (Text-tig. 1). The broad Everglades depression carries fresh water flow southward from Lake Okeechobee to the sea via the Shark River Slough complex (Text-fig. 1). The Everglades depres- sion is underlain by Pleistocene lagoonal deposits termed the bryozoan facies of the Miami Limestone by Hoffmeister et al. (1967). The depression is choked with Holocene freshwater peat and calcitic mud de- posits (Wanless et 1989). A natural coastal dam of mangrove peat and storm-levee marl inhibits saline in- t
. Bulletins of American paleontology. Pollen Zonation: O'Neal et al. 103 al Ridge to the east (Text-tig. 1). The broad Everglades depression carries fresh water flow southward from Lake Okeechobee to the sea via the Shark River Slough complex (Text-fig. 1). The Everglades depres- sion is underlain by Pleistocene lagoonal deposits termed the bryozoan facies of the Miami Limestone by Hoffmeister et al. (1967). The depression is choked with Holocene freshwater peat and calcitic mud de- posits (Wanless et 1989). A natural coastal dam of mangrove peat and storm-levee marl inhibits saline in- trusion into the depression. The oolitic limestone ridge of the Miami Limestone crests 2-6 m above sea level, extends north-south from north Miami to the south, where it then curves westward. The Atlantic Coastal Ridge is cross-cut by numerous fossil tidal channels. These channels form swales that are filled with quartz sand and peat and served as conduits for fresh water flow through the ridge prior to drawdown of Ever- glades water levels in the early 1900"s (Wanless et al., 1989). In addition to the physiographic units defined by Pliocene and Pleistocene ridges, Holocene sediment buildups generate coastlines and marine buildups which define the coastal complex. Along the northern shore of Florida Bay, transgressive to regressive coast- al storm levees of carbonate mud form the shoreline. Broad progradational peat and coastal sand and mud accumulations form a coastal mangrove forest and transitional marsh complex along the western shoreline (Wanless et 1995). The study area is characterized by elevations that are generally less than m above mean sea level (MSL) (Spackman et al., 1966). In the area south of Lake Okeechobee, elevations are as much as 10 m above MSL and gently slope to the south (Spackman et al., 1966). Changes in topography, although subtle, are significant in that natural highs and lows strongly influence the depth of the water ta- ble, thickness
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