How incredible is Nature! Dr Hermann Pfefferkorn and three Chinese researchers discovered a 300 years old Tropical Forest which in North China which had been covered by volcanic ashes.
They discovered six types of plants, some of them up to 24.3 meters tall, which some of them have disappeared. In an area of one kilometer they found trees with leaves, branches and trunks.
Sources: Econews article “«Ζωντάνεψαν» απολιθωμένο δάσος 300 εκατ. Ετών”, 22-02-2012, http://www.econews.gr/2012/02/22/apolithwmeno-dasos-kina/