How a huge forest of extinct trees sparked transformation of life on Earth
(PHYSorg.com Archaeology & Fossils)

If you were to step back in time some 365 million years, you might see a landscape more akin to the wilder shores of science fiction than earthly reality. Imagine a forest made up only of one kind of tree. A thin, straight, leaf-covered trunk just a few metres tall, dividing at the very top into four short hanging branches. A little like a green, living version of an art deco streetlamp.