Wellhead (IMAGE) Penn State Caption Lead researcher Kathryn Barlow, a doctoral student in ecology, conducts a plant survey on the edge of a Marcellus shale natural gas well pad. Credit Mortensen Lab, Penn State Usage Restrictions non commercial use only 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.