Microbial Mat (IMAGE) Oregon State University Caption The white microbial mats seen here are telltale signs of areas where methane may be released from underground methane deposits. Credit Andrew Thurber Oregon State University. 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.