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Butte

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In the study of geomorphology, a butte is a specific type of isolated hill. These landforms are characterized by very steep, often vertical sides. They also feature a relatively small and flat top. Buttes are smaller than other large landforms like mesas, plateaus, or tablelands. The term comes from the French word "butte," which means a knoll of any size. While the word can describe any small hill, it is very common in the Western United States. In the Southwest, the term is often used for much larger landforms.

Monument Valley, late afternoon
Monument Valley, late afternoon

Geographers use a specific rule of thumb to distinguish a butte from a mesa. A mesa is a large, flat-topped hill where the top is wider than the hill is tall. In contrast, a butte has a top that is narrower than its total height. This difference in proportions gives buttes their distinctive, tower-like appearance. Because of these unique shapes, they often serve as important landmarks. They can be found in both wide plains and mountainous regions.

Buttes form through the combined processes of weathering and erosion. The process begins when a layer of hard caprock sits atop a layer of less resistant rock. Caprock is a hard layer of stone that acts as a protective shield. As wind abrasion occurs, the wind wears away the softer rock underneath. However, the hard caprock resists this wear. This protection allows the softer rock to remain standing in an isolated shape.

B D - Devil's Tower select (3) 1.1 (by)
B D - Devil's Tower select (3) 1.1 (by)

As the erosion process continues, the butte changes over time. The top of the landform is further worn down by weathering and abrasion. Eventually, excess material breaks off from the structure. This fallen rock collects around the base of the hill. These piles of debris are known as scree or talus slopes. On a much smaller scale, this exact same process creates landforms called hoodoos. This shows how the same natural forces shape many different types of terrain.

Many famous buttes are located in the United States. The Mitten Buttes are two very famous examples. They are located in Monument Valley on the Utah and Arizona state line. These buttes are widely recognized because they appeared in many western-themed films. Specifically, they provided the background for seven movies directed by John Ford.

Monument Valley, late afternoon
Monument Valley, late afternoon

Another prominent landmark is Thumb Butte. It is located in northern Arizona and overlooks the city of Prescott.

Most buttes are composed of sedimentary rocks like sandstone or limestone. However, there are notable exceptions to this rule. Devils Tower in northeastern Wyoming is a very famous laccolithic butte. A laccolithic butte is formed from igneous rock rather than sedimentary layers.

B D - Devil's Tower select (3) 1.1 (by)
B D - Devil's Tower select (3) 1.1 (by)

This makes its geologic makeup quite different from the common sandstone buttes found elsewhere. This variety shows how different types of rock react to the forces of nature.

Sometimes the term "butte" is used more broadly or loosely. Some landforms have craggy or pointed tops rather than flat ones. For example, Scotts Bluff in Nebraska is a collection of five bluffs. Crested Butte in Colorado is actually a mountain. Elephant Butte in New Mexico is now an island in a reservoir. There are also large hills that use the name but but are not technically buttes. Examples include Kamiak Butte, Chelan Butte, and Steptoe Butte in Washington state. Many buttes also go by different names, such as Courthouse Rock in Nebraska.

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File:Monument Valley, late afternoon.jpg
Monument Valley, late afternoon.jpg
File:B D - Devil's Tower select (3) 1.1 (by).jpg
B D - Devil's Tower select (3) 1.1 (by).jpg
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