A huge tract of fossil rain forest has been discovered in underneath the US Midwest. They have discovered not only one forest, but 6 tracts of rain forest that are about two millions years old. They are the earliest forests ever to appear on earth.
Most of the forests are stacked up and date back to eras before and just after intense global warming. It was a time where the earth climate changed alot, from being covered with icecaps (it was even possible to walk from the US to Europe, because the North Pole was connected to the two continents) to a greenhouse state which had a tropical like climate.
The fossilized plants suggest sudden dramatic change occurred, with dense vegetation and trees up to 40 meters (130 feet) high being largely replaced by tree fern species says Falcon-Lang leader of the University of Bristol in the U.K.
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