Mystery Solved: Ocean Acidity in the Last Mass Extinction (image) Yale University Share Print E-Mail Caption A new study led by Yale University confirms a long-held theory about the last great mass extinction event in history and how it affected Earth's oceans. The findings may also answer questions about how marine life eventually recovered. Credit Michael Henehan & Pincelli Hull Usage Restrictions None Share Print E-Mail 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.