An international team of paleontologists has discovered a tropical forest preserved in ash when a volcano erupted 300 million years ago in what is today northern China. Reconstruction of a 300-million-year-old peat forest in northern China (Ren Yugao / J. Wang et al / PNAS) A new study, published today in the Early Edition of the Proceedings of the National Academy of Sciences, presents a reconstruction of this fossilized forest, lending insight into...