image: Sedimentary rocks at Meishan, China. These rocks contain signatures of a disturbance in the carbon cycle immediately preceding Earth's greatest mass extinction. This material relates to a paper that appeared in the Sept. 20, 2017, issue of Science Advances, published by AAAS. The paper, by D.H. Rothman at Massachusetts Institute of Technology in Cambridge, Mass., and colleagues was titled, "Thresholds of catastrophe in the Earth system." view more
Credit: [Credit: Shuzhong Shen]