Sediments reveal ancient ocean during a mass extinction
A quarry illustrating bands of layered limestone from the ancient seabed in what is now Mercato San Severino in Italy. Credit: F. Tissot About 183 million years ago, volcanic activity in modern South Africa unleashed an estimated 20,500 gigatons of carbon dioxide (CO2) in the ocean-atmosphere system over a period of 300 to 500 thousand … Read more