And plant created wood
Wood is starting to show its age. Philippe Gerrienne, a researcher in palaeobotany at the University of Liège, discovered two plant fossils that are 407 and 397 million years old respectively and contain traces of wood. The earliest ever brought to light! This discovery has pushed back the emergence of wood on earth by some 10 million years. It also confirms a hypothesis: it would seem that wood was not made by plants in order to increase their resistance and become trees, but initially to allow improved circulation of water. The results of this research have been published in the journal Science (1).
(1) Philippe Gerrienne, Patricia G. Gensel, Christine Strullu-Derrien, Hubert Lardeux, Philippe Steemans, Cyrille Prestianni, A Simple Type of Wood in Two Early Devonian Plants, Science 333, 837 (2011)