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 .
List of fishes of Yellowstone National Park
The Yellowstone cutthroat trout "(Oncorhynchus clarik bouvieri)" inhabits the Yellowstone River drainage from the headwaters to Yellowstone Lake north to the park boundary at Gardiner, MT to include the Lamar River drainage. It has been widely stocked in park lakes previously barren of fish. Prior to the introduction of non-native trout, the Yellowstone cutthroat was the primary quarry of anglers in the park. Fishing Bridge across the Yellowstone River at the outlet of Yellowstone Lake was a favorite location for catching cutthroats or observing their spawning behavior. Lake trout introduction into Yellowstone Lake has caused serious decline in the Yellowstone cutthroat trout population.