Gilbert and Lateral Planation Theory

The Lateral Planation Theory explains the formation of pediments, which are broad, gently sloping surfaces found at the base of mountains or hills in arid and semi-arid regions.

This theory posits that erosion occurs primarily along the base of the retreating mountain slopes. Rivers and streams flowing from the mountains erode their banks laterally, widening the valley floor and beveling the base of the mountain, thus forming the pediment.

G. K. Gilbert is credited with proposing the Lateral Planation Theory.

While other geomorphologists like William Morris Davis proposed different models for landscape evolution, such as the theory of slopes and the cycle of erosion, Gilbert's contribution specifically focused on lateral erosion as the dominant process in pediment development.

• Key Proponent: G. K. Gilbert
• Theory Focus: Lateral erosion at the base of slopes
• Resulting Landform: Pediment

Therefore, the Lateral Planation Theory of pediment formation was proposed by Gilbert.