SPE 453 (IMAGE) Geological Society of America Caption GSA Special Paper 453: Preservation of Random Megascale Events on Mars and Earth: Influence on Geologic History, edited by Mary G. Chapman and Laszlo P. Keszthelyi. Credit Geological Society of America Usage Restrictions credit Geological Society of America 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.