Zumaia cliffs (IMAGE) University of Barcelona Caption The Zumaia cliffs are characterized by an exceptional section of strata that reveals the geological history of the Earth in the period of 115-50 million years ago (Ma). Credit UNIVERSITY OF BARCELONA / IUCA-UNIVERSITY OF ZARAGOZA Usage Restrictions Credit must be given to the creator. License CC BY 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.