Cap Carbonate Rocks (IMAGE) University of Washington Caption A person looks at cap carbonate rocks in South China in 2019. The new study provides a new explanation for dramatic global environmental changes that led to their formation. Credit Yarong Liu Usage Restrictions With credit License Original 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.