In geomorphology, a butte ( ) is an isolated hill with steep, often vertical sides and a small, relatively flat top; buttes are smaller than , , and tablelands. The word butte comes from the French language word (), meaning 'hillock' (of any size); its use is prevalent in the Western United States, including the Southwest, where is used for the larger landform.
Due to their distinctive shapes, buttes are frequently landmarks in and mountainous areas. To differentiate the two landforms, geographers use the rule of thumb that a mesa has a top that is wider than its height, while a butte has a top that is narrower than its height.
Formation
Buttes form by
weathering and
erosion when hard
caprock overlies a layer of less resistant rock that is eventually worn away. The harder rock on top of the butte resists erosion. The caprock provides protection for the less resistant rock below from wind abrasion which leaves it standing isolated. As the top is further eroded by abrasion and weathering, the excess material that falls off adds to the
scree or talus slope around the base.
On a much smaller scale, the same process forms hoodoos.
Notable buttes
The Mitten Buttes of
Monument Valley in the
Utah–
Arizona state line are two of the most distinctive and widely recognized buttes. Monument Valley and the Mittens provided backgrounds in the scenes of many western-themed
, including seven movies directed by
John Ford. Another very well-known and frequently photographed butte in northern Arizona is
Sierra Prieta, which overlooks the city of Prescott and is the most prominent and distinctive geologic landmark in the vicinity. The
Devils Tower in northeastern
Wyoming is a
butte composed of
igneous rock rather than
sandstone,
limestone or other
.
The term butte is sometimes applied more broadly to isolated, steep-sided hills with pointed or craggy, rather than flat, tops.[ Three notable formations that are either named butte or may be considered buttes even though they do not conform to the formal geographer's rule are Scotts Bluff in Nebraska which is a collection of five bluffs, Crested Butte, which is a mountain in Colorado, and Elephant Butte, which is now an island in Elephant Butte Reservoir in New Mexico.
]
Among the well-known non-flat-topped buttes in the United States are Bear Butte, South Dakota, Black Butte, Oregon, and the Sutter Buttes in California. In many cases, buttes have been given other names that do not use the word butte, for example, Courthouse Rock, Nebraska. Also, some large hills that are technically not buttes have names using the word, examples of which are Kamiak Butte, Chelan Butte and Steptoe Butte in Washington state.
Gallery
File:Butte pdphoto roadtrip 24 bg 021604.jpg|Courthouse Butte near Sedona, Arizona
File:Вид на крепость Качахакаберд4.JPG|Kachaghakaberd or Kachaghakaberd fortress, Khojali District, Azerbaijan
File:Pawnee Buttes2010.jpg|Pawnee Buttes, Pawnee National Grassland, Colorado
File:Algérie 2009.jpg|Tamanrasset Province, Algeria
See also
Footnotes
External links