. Bulletins of American paleontology. 52 Bulletin 361 SITE 6 Radiometcic ^*- # Dates o'" <i^ 1960 AD â 10 1900 AD â 1475-1665 AD 1455-1665 AD 1305-1460 AD L* .cP 0 20 40 60 PERCENT ABUNDANCE y .sc?. *' J" -cT :^\r.^. r .>r II )Vd2 Wet Prairies lib III IV d2 Wet Prairies with Dwarl Mangroves III Vb2 Sawgrass Marshes Near Tree Islands Cattail Marshes Brackish Marshes 111 Southwest Flonda Mangrove Forests IV d2 Dwart Mangroves â i IV di Wel Prairies 0-1 SQUARED CHORD DISTANCE M Myrica 1^1 Asteraceae EZI] Typha Text-figure 7.âPercent abundance of pollen of major plant groups at sit
. Bulletins of American paleontology. 52 Bulletin 361 SITE 6 Radiometcic ^*- # Dates o'" <i^ 1960 AD â 10 1900 AD â 1475-1665 AD 1455-1665 AD 1305-1460 AD L* .cP 0 20 40 60 PERCENT ABUNDANCE y .sc?. *' J" -cT :^\r.^. r .>r II )Vd2 Wet Prairies lib III IV d2 Wet Prairies with Dwarl Mangroves III Vb2 Sawgrass Marshes Near Tree Islands Cattail Marshes Brackish Marshes 111 Southwest Flonda Mangrove Forests IV d2 Dwart Mangroves â i IV di Wel Prairies 0-1 SQUARED CHORD DISTANCE M Myrica 1^1 Asteraceae EZI] Typha Text-figure 7.âPercent abundance of pollen of major plant groups at site 6. southern Taylor Slough. SCD values show lowest squared chord distance values for modern analogs; SCD < are considered to be close analogs for fossil assemblages. Cluster designations refer to clusters designated in Text-figure 3 and Table 3. cates fresh-water conditions and short to moderate hy- droperiods. These long-term differences in hydrologic regimes between northern and southern sites is reflect- ed in the present vegetational distribution and substrate type and probably reflects underlying geologic con- trols, including differences in the underlying lime- stone. Northern sites are underlain by the Fort Thomp- son Formation, which consists of a series of alternating freshwater and marine limestones. Southern sites are underlain by the Miami Limestone, consisting of an upper, oolitic limestone overlying a bryozoan facies (Gleason and Stone, 1994). The impact of climate variability on Everglades vegetation and hydrology is indicated in sediments de- posited between the 9"" to IB"" centuries. During this time, water was shallower at most Ridge and Slough sites, with the greater abundance of weedy annuals suggesting rapid drying or prolonged droughts. Near Florida Bay, salinity increased at this time. Also during this interval, known as the Medieval Warm Period (MWP) (9'" to \4'^ centuries) (Hughes and Diaz, 1994), prolonged droughts
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