Show shells on mounta mountains ans I 1 clue to earths story there was a time when people knew very little about rocks and mountains they wandered across hills and valleys but could not explain the history of the land shells found on mountain tops made men wonder about changes in the past how could shells of sea animals have reached layers of rock thousands of feet above seg sea level they asked leonardo da vinci who lived in the time of columbus put that question before the world he said the shells must mean that the earths surface had changed greatly through the ages As time went on study proved that the shells were real that they surely must have covered ani animals which had lived long before such proofs led to statements like this yes the shells are real but they must have been left on mountain tops at the time of noahs flood there were many who held that view and more than two centuries passed before it was given up the only thing which brought men to agree with the words of leonardo was the slow careful work of scientists ts the scientists found facts which at last made it clear that the earths surface has been changing through the ages |