Image 2 (IMAGE) Geological Society of America Caption Recessed meteoritic ejecta layer site 1.1-m-thick deposit beneath thick sequence of basaltic lava flows. Credit Simon Drake Usage Restrictions Credit: Simon Drake and <i>Geology</i>. 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.