Outcrop (IMAGE) University of Wisconsin-Madison Caption This transition, from solid bedrock to pulverized rock in subsoil, probably occurs on land around the globe. A new study from UW-Madison scientists shows bacteria's critical role at the beginning of soil formation. Credit Stephanie Napieralski 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.