Paleosol on the Island of Gran Canaria (IMAGE) Geological Society of America Caption A paleosol on the island of Gran Canaria, sandwiched between basalt flows dated to 3.0-2.9 million years ago -- to the Pliocene. Credit Credit: Daniel Muhs Usage Restrictions Credit: Daniel Muhs. 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.