Cover, GSA Special Paper 505 (IMAGE) Geological Society of America Caption This is the cover of GSA Special Paper 505: Volcanism, Impacts, and Mass Extinctions. Credit GSA Special Paper 505 Usage Restrictions Credit GSA Special Paper 505 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.