The Clarno Formation is a geological formation located in the state of Oregon, primarily known for its rich fossil deposits. It dates back to the Eocene epoch, approximately 56 to 34 million years ago. The formation consists mainly of volcanic rocks, sedimentary layers, and ancient plant remains, providing valuable insights into the region's prehistoric environment. This formation is particularly significant for its diverse fossilized flora and fauna, including early mammals and various plant species. The fossils found in the Clarno Formation help scientists understand the climate and ecological conditions of the time, contributing to the broader study of paleontology and geology.