Keywords: FossilTreesSpecimenRidgeYNP1890.jpg en Yellowstone National Park Wyoming Fossil tree trunks pilyoxylon aldersoni in Fossil Forest on Specimen Ridge Two fine specimens of fossil trees exposed on a steep hillside by the erosion of the basic breccia in which roots are firmly embedded Nearby is a bold cliff showing the character of the breccia and the manner in which it has been deposited Circa 1890 Figure 2 U S Geological Survey Folio 30 Downloaded from USGS Photo Library http //libraryphoto cr usgs gov/htmllib/batch82/batch82j/batch82z/batch82/ijp00325 jpg J P Iddings 1890 PD-USGov Mountains of Yellowstone Mountains of Wyoming Rock formations in Wyoming Specimen Ridge Petrified wood Petrified trees in Yellowstone National Park |