E-Mail Boulder, Colo., USA: The Geological Society of America regularly publishes articles online ahead of print. For April, GSA Bulletin topics include multiple articles about the dynamics of China and Tibet; the Bell River hypothesis that proposes that an ancestral, transcontinental river occupied much of northern North America during the Cenozoic Era; new findings in the climatic history during one of the Earth's coldest periods: The Late Paleozoic Ice Age; and the age an nature of the Chicxulub impact crater. You can find these articles at https://bulletin.geoscienceworld.org/content/early/recent . Evidence of Carboniferous arc magmatism preserved in the Chicxulub