. Bulletins of American paleontology. Pollen Zonation: O'Neal et al. 119. Cluster Group Membership ® Cluster 1 O Cluster 2 O Clusters Mangrove Swamp ⦠Cluster 4 O Cluster 5 Freshwater Marsh â Cluster h a Cluster? Headwater Marsh A Clusters A Cluster 9 Brackish and Transitional Marsh D Cluster 10 Ipland Physiographic Provinces ^^1 Mangrove Swamp 1 I Brackish & Transitional Marsh fy â /'â w Freshwater Marsh (Slough) I J Freshwater Marsh with Hammocks P I I I Limestone Upland Complex Text-figure 7.âOverlay of sample site cluster groupings on phys- iographic map of southwest Florida showing
. Bulletins of American paleontology. Pollen Zonation: O'Neal et al. 119. Cluster Group Membership ® Cluster 1 O Cluster 2 O Clusters Mangrove Swamp ⦠Cluster 4 O Cluster 5 Freshwater Marsh â Cluster h a Cluster? Headwater Marsh A Clusters A Cluster 9 Brackish and Transitional Marsh D Cluster 10 Ipland Physiographic Provinces ^^1 Mangrove Swamp 1 I Brackish & Transitional Marsh fy â /'â w Freshwater Marsh (Slough) I J Freshwater Marsh with Hammocks P I I I Limestone Upland Complex Text-figure 7.âOverlay of sample site cluster groupings on phys- iographic map of southwest Florida showing strong correlation be- tween environmental pollen clusters and physiographic provinces. Clusters 1. 2. and 3 are the mangrove swamp; clusters 4 and 5 are the freshwater marsh; clusters 6 and 7 are the headwater marsh; clusters S and 9 are the brackish marsh; and cluster 10 is the upland complex. clusters. The abundance of a variety of freshwater-de- pendent taxa such as Nynipluiea. cf. Ovoidites. and Utriciilaria assist in delineating this pollen zone, but compositional differences between the slough and ad- jacent marshes with hammocks result primarily from a large increase in the frequency of chenopods in the slough. Riegel (1965) attributed the dominance of che- nopods and Nynipluiea in the slough to their need for a higher water table in this low-lying area. Differences in the headwater marsh clusters are based on changes in the frequency of Rhizopliora and chenopods. Chenopods comprise more than 60% of samples from the headwater marsh (cluster 6) and are less dominant in cluster 7. Rliizopliora. which com- prises less than 2% of any of the samples in cluster 6. increases to an average of 16% in cluster 7. The in- crease in Rhizoplioni occurs in samples nearer to shore where the slough shifts to channels and Rhizophoro is localized along the margins. Samples from the brackish marsh, cluster 8. contain a wide variety of taxa. Tidal variability as well as fluc- tuatio
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