As the name implies, this structure is formed by nature; but it is considered an arch or window, rather than a bridge. It was formed through several methods of weathering Frost wedging creates expansion within the cracks of the rock, through many freeze-thaw cycles. In addition, the rock is slowly dissolved by chemicals in rainwater, affecting the exposed portions of the wall. Finally, gravity caused the center portion of rock to fall, as it weakened over time. Like hoodoos, these structures are still being eroded away; time will inevitably take them all down. There are several arches like this at Bryce Canyon; all were formed over thousands of years. A small stand of Quaking Aspen is located near the parking area, standing out among the Ponderosa Pines nearby. Ýview    270 220 2 84