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During the Last Glacial Maximum about 18,000 years ago, the glacial front in the eastern United States extended south to the approximate location of the Missouri and Ohio River. These glaciers destroyed any vegetation in their path, and cooled the climate near their front.
Although the major modern community types were flourishing in the Southeast by 10,000 years BP, and the climate was similar to that today, the understory flora had not yet come to resemble modern herbaceous floras. Mixed hardwood forests dominated the majority of the upper Coastal Plains, Piedmont, and lower mountain regions. Southern pine ...
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Was the oldest living non-clonal organism. The age was estimated at 5,000 years. The tree was cut down on 6 August 1964, by a graduate student and US Forest Service personnel for research purposes, though at the time they did not know of its world-record age. Senator: Pond cypress (Taxodium ascendens) Big Tree Park, Longwood, Florida, US ~3,500
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Most of these plants have true roots and leaves, and many were quite tall. The tree-like Archaeopteris, ancestral to the gymnosperms, and the giant cladoxylopsid trees had true wood. These are the oldest known trees of the world's first forests. Prototaxites was the fruiting body of an enormous fungus that stood more than 8 meters tall. By the ...