Fracking Pperation on the Marcellus Shale Formation (image) University of Vermont Share Print E-Mail Caption A fracking operation on the Marcellus Shale Formation in Pennsylvania is shown. New research shows that abandoned oil and gas wells near fracking sites can be conduits for methane emissions not currently being measured. Credit U.S. Geological Survey/public domain Usage Restrictions None Share Print E-Mail 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.