Erratics

Erratics are large rocks or boulders that have been transported and deposited by glaciers far from their original location. During Ice Age periods, glaciers moved across the landscape, picking up rocks and carrying them over long distances. When the glacier melts, it leaves these rocks behind, often in areas where such rocks are not native. These unusual rocks are called erratics because they stand out from the surrounding terrain, giving clues about the direction and extent of past glacial movement. They are important geological evidence of historical glacial activity.