The scientists are now sampling other wells, but they're also hunting Frackibacter in rock cores from pristine, unfracked sites. (discovermagazine.com)
They hope to retrieve rock cores bearing clues to how life returned in the wake of the cataclysm. (science.sciencemag.org)
Evidence blaming mass extinctions during the Permian period on a large asteroid or a comet was found in rock cores there. (sciencemag.org)