At 4,097 feet Marys Peak towers over other mountains in the Oregon Coast Range. Dr. Robert J. Lillie draws on his experience as a geology professor, graphic illustrator and park ranger to tell the geological story of Marys Peak and its connections to Oregons natural and cultural history. The books vivid photographs and easy-to-follow illustrations allow the reader to imagine geological forces in action during a drive up the peak and short walk to its summit. From volcanic eruptions on an ancient seafloor, to powerful forces between tectonic plates, to the durability of hard intrusive rock, a journey up Marys Peak is truly like visiting an Island in the Sky.