image: Dr. Tyler Lyson, Curator of Vertebrate Paleontology for the Denver Museum of Nature & Science, holds open a split concretion and reveals the cross section of a vertebrate skull inside. This material relates to a paper that appeared in the Oct. 25, 2019 issue of Science, published by AAAS. The paper, by T. Lyson at Denver Museum of Nature & Science in Denver, CO, and colleagues was titled, "Exceptional continental record of biotic recovery after the Cretaceous-Paleogene mass extinction." view more
Credit: HHMI Tangled Bank Studios