This corrie was formed, like Glen Coe, by the movement of glaciers. The principal glacier in the glen below was larger and heavier, and carved out a deeper trough than that of Coire Gabhail. When the glaciers melted a hanging valley was left, high above the glen. Debris from the glaciers left moraines in the mouths of the glens and corries, often resulting in a lake forming behind them. In time these waters found their way through the debris and the lake drained leaving a relatively flat-bottomed alluvial plain which now forms the floor of the corrie.