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Ancident trees recorded in mines
the six forests straddle a preseriod in earth history 306 million years ago that saw a rapid shift from an icehouse climate with big polar ice caps to a greenhouse climate in which the ice caps would have melted .
theses are the largest fossil forests fousand anywhered in the world at any point in geological time, he told reporters .
scientists look up to see what would have been the forest floor .
spectaculargest fossil forests have been fousand into their coal mines of illinois by a -uk team of researchers .
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