Mount Hare Formation (IMAGE) Stanford University Caption A geologist looks down at exposed Ordovician (approximately 475 million years ago) chert and shale of the Mount Hare Formation, Road River Group, on the Peel River, Yukon. Credit Erik Sperling Usage Restrictions Credit required 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.