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Badlands

earth science Maturity 11-13 Next article →

Badlands are a unique type of dry terrain defined by intense erosion.

Chinle Badlands
Chinle Badlands

They consist of soft sedimentary rocks and clay-rich soils that wear away easily. These landscapes are marked by steep slopes and very little vegetation. Because the ground is so uneven, they are often difficult to navigate on foot. They are also unsuitable for agriculture. You can find badlands on every continent except Antarctica. They are most common in areas with unconsolidated sediments, which are materials not yet turned into hard rock.

The way badlands look is due to a specific process of water erosion.

Linze, Zhangye, Gansu, China - panoramio (4)
Linze, Zhangye, Gansu, China - panoramio (4)

Even in dry areas, rainfall can be infrequent but very heavy. Because the surface is often made of impermeable mudrock, the water cannot soak into the ground. Instead, the rain is channeled into a dense system of small streamlets. These streamlets erode the surface, creating ever-enlarging gullies and deep ravines. This creates a high drainage density, which is the total length of water channels per unit of land. The landscape becomes a complex web of deep channels separated by short, steep ridges called interfluves.

Specific geological features often rise out of this eroded landscape.

A030, Theodore Roosevelt National Park, North Dakota, USA, 2001
A030, Theodore Roosevelt National Park, North Dakota, USA, 2001

You might see buttes or hoodoos, which are tall, isolated hills. These forms exist because of resistant beds of sandstone. This hard layer acts as a caprock, or a protective lid, on top of the softer material. While the sandstone stays in place, the softer rock underneath is eaten away by rain. In some badlands, water also moves through the subsurface. This creates a system of connected void spaces called piping, though this is not found in every badland area.

In many arid badlands, the layer of loose material on the surface is very thin. Scientists call this the regolith.

Toadstool Geologic Park
Toadstool Geologic Park

In dry climates, the regolith profile often follows a specific pattern. The top layer, about 1 centimeter thick, usually consists of silt, shale, and sand. This layer might look like a hard crust or a loose collection of "popcorn" fragments. Beneath this is a sublayer about 5 centimeters deep. Below that, a transitional shard layer of loose shale chips eventually meets the unweathered shale bedrock. These profiles are common in places like the Mancos Shale or the Brule Formation.

While most badlands are natural, humans can also create them.

Cheltenham Badlands panorama1
Cheltenham Badlands panorama1

These are known as anthropogenic badlands. They occur when the protective layer of vegetation is destroyed. This can happen through overgrazing by livestock, land clearing, or pollution like acid rain. For example, the Cheltenham Badlands in Ontario, Canada, were created by cattle grazing. In Spain, the Las Médulas area was shaped by gold mining. Once the plants are gone, the soft shale can erode very rapidly.

Many famous badlands serve as important sites for scientific research.

Tyrrell Museum Badlands from the interpretive trail 8
Tyrrell Museum Badlands from the interpretive trail 8

In the United States, Badlands National Park in South Dakota is a major site. It is estimated that this park erodes at a rate of about 1 inch per year. The White River in this park is named for the heavy load of bentonite clay it carries from erosion. Other famous sites include the colorful Zhangye National Geopark in China and the Valle de la Luna in Argentina.

Ischigualasto provincial park
Ischigualasto provincial park

These areas are often rich in fossils and geological samples.

Badlands are more than just strange landscapes; they are active geological systems. They show us how water, climate, and rock types interact to reshape the Earth. Whether they are natural formations or caused by human activity, they remain powerful examples of erosion in action. They connect to broader studies in geomorphology, which is the study of how landforms change over time. By studying these steep ridges and deep gullies, scientists can better understand the history of our planet's surface.

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🖼️ Images & Media (9)
File:Chinle Badlands.jpg
Chinle Badlands.jpg
File:A030, Theodore Roosevelt National Park, North Dakota, USA, 2001.jpg
A030, Theodore Roosevelt National Park,...
File:Cheltenham Badlands panorama1.jpg
Cheltenham Badlands panorama1.jpg
File:Ischigualasto provincial park.jpg
Ischigualasto provincial park.jpg
File:Tyrrell Museum Badlands from the interpretive trail 8.jpg
Tyrrell Museum Badlands from the...
File:Linze, Zhangye, Gansu, China - panoramio (4).jpg
Linze, Zhangye, Gansu, China - panoramio (4).jpg
File:Calanchi1.jpg
Calanchi1.jpg
File:Bardenas Reales 10.jpg
Bardenas Reales 10.jpg
File:Toadstool Geologic Park.jpg
Toadstool Geologic Park.jpg
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