Western Blue Mountains Field Trip: Clarno, John Day, Picture Gorge, and Mascall Formations (cwmh2o.com)Members of the CwM team recently traveled out to east-central Oregon for field work, stopping along the way to view some of the major geologic formations of the western Blue Mountains. Their trip took them through the towns of Fossil, Spray, Kimberly, Dayville, and Mitchell. In the process, they drove across 45 million years of geologic history from the Clarno Formation to the Rattlesnake Formation.