Colville Site (IMAGE) University of Alaska Fairbanks Caption The Colville River flows across Alaska's North Slope. The bluffs on the left bank are made of the 70-million-year-old Prince Creek Formation and contain bones and teeth of dinosaurs and tiny mammals. Credit Patrick Druckenmiller photo Usage Restrictions None 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.