Flat-topped landforms, such as buttes and mesas, are the remains of giant ancient trees. Tree features can be seen in Devils Tower, for example – the large hexagonal columns are fibers of a tree that would have been 19,000 feet tall. Other tree features can be seen in buttes and mesas, such as sloped sides and flat tops that look like tree stumps after trees are cut down.
Mesas are broad flat topped mountains with at least one steep side. Buttes are smaller flat topped mountains or hills with steep slopes on all sides. [...] Depositional Features and Landforms [...] Park Landforms and Features