Window Rock (Navajo: Tségháhoodzání) is a pothole-type natural arch eroded through Entrada sandstone. Chemical exfoliation deepened a pothole in the rock until it breached the back of a shallow recess in the cliff several feet above its base. Subsequent weathering, freezing and thawing created the smooth oval front entrance of the arch.  It is located in the city of the same name.   The city of Window Rock serves as the seat of government and capital of the Navajo Nation.