Working on a Core (IMAGE) University of Oregon Caption Postdoctoral researcher Daniele Colombaroli, left, works on a soil core sample taken at Upper Squaw Lake in southern Oregon. Credit University of Oregon Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.