Yellowstone National Park
Yellowstone National Park has one of the world's largest petrified forests, trees which were long ago buried by ash and soil and transformed from wood to mineral materials. This ash and other volcanic debris are believed to have come from the park area itself as the central part of Yellowstone is the massive caldera of a supervolcano. The park contains 290 waterfalls of at least , the highest being the Lower Falls of the Yellowstone River at .
Mount Jackson (Wyoming)
Mount Jackson el. is a mountain peak just north of the Madison River, in the Gallatin Range of Yellowstone National Park. Mount Jackson is named in honor of William Henry Jackson, chief photographer of the Hayden Geological Survey of 1871 and a member of several subsequent geological surveys in the park. Jackson's photographs are some of the earliest ever taken in Yellowstone. The name was suggested by a park naturalist in 1935 but not awarded until 1937 when Jackson, who was still living gave his approval. Jackson visited the park regularly until his death in 1942.