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U.S. geologist, one of the founders of modern geomorphology, the study of landforms. He first recognized the applicability of the concept of dynamic equilibrium in landform configuration and evolution-namely, that landforms reflect a state of balance between the processes that act upon them and the structure and composition of the rocks that compose them. Gilbert clearly expounded this concept in his geological report on the Henry Mountains, Utah, and in his other pioneering works in the western United States.