DL-9 Fissure (IMAGE) Seismological Society of America Caption These are clay-filled fissure in sediments at Douglas Lake, Tennessee. Credit Randel Cox Usage Restrictions Please use full credit information 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.