Rugged Hills in North Dakota: The Badlands

The dramatic, eroded hills in southwestern North Dakota are called the Badlands (part of the larger Little Missouri Badlands).

Formation

Millions of years of erosion by the Little Missouri River and tributaries carved soft sedimentary layers (sandstone, shale, clay) into:

• Steep cliffs and buttes
• Deep canyons and ravines
• Colorful banded strata (oxidized iron = reds; reduced = grays/greens)

Ecology & Significance

• Unique prairie-woodland mosaic
• Rare plants: cacti, sagebrush, yucca
• Wildlife: bison, bighorn sheep, prairie dogs, golden eagles
• Theodore Roosevelt National Park protects three units here—Roosevelt ranched nearby 1880s.
• Rich fossil beds (dinosaurs, mammals)

The name "Badlands" derives from Lakota mako sica and French mauvaises terres—"bad lands" for travel, but spectacular for scenery.