Late Eocene-Early Oligocene paleofloristic patterns in southern Mississippi and Alabama, US Gulf Coast

摘要: Abstract Climate, vegetation and sediment supply are fundamental controls on the palynofloras of depositional sequences. In ancient environments, diversity abundance palynomorphs being transported into, preserved in basin deposition dependent these factors as well burial conditions. Preserved palynomorph assemblages can be used to recognize past floral patterns climates, such a model is here interpret Late Eocene Shubuta Member Yazoo Formation Early Oligocene Vicksburg Group southern Mississippi southwestern Alabama. Two hundred sixty spore pollen taxa have been identified strata. Eleven groups representing about 50% recognized basis abundance, occurrence most samples ecological significance. The spores, bisaccate pollen, Sequoiapollenites-Cupressacites, Momipites, Carya, Quercoidites, Fraxinoipollenites, Cupuliferoidaepollenites, Cupuliferoipollenites, Cyrillaceaepollenites , Siltaria . Statistical analysis presence-absence data produced five significant cluster which were dominated by species eleven groups, Ulmipollenites thompsonianus Salixipollenites parvus These show some significance because they appear represent upland, swamp marsh taxa. prominence Sequoiapollenites, Cupressacites Cyrillaceiopollenites rich assemblage, contains tropical subtropical elements, suggests warm temperate paleoclimate during Paleogene eastern Gulf Coast. Although Momipites was generally more abundant Quercoidites increased Oligocene, there no paleofloristic change across Eocene-Oligocene boundary.