Glaciers carved out distinctive U-shaped valleys in the Rocky Mountains during past ice ages.

During past ice ages, glaciers played a significant role in shaping the Rocky Mountain landscape. As these massive ice sheets moved through the mountains, they carved out characteristic U-shaped valleys. These valleys are distinct from V-shaped river valleys, having a wider, flatter bottom and steep sides. This glacial feature is a prominent reminder of the powerful forces that have shaped the Rockies over time.