The Twiss runs here through a rocky gorge in which there are several waterfalls, of which Thornton Force is the most famous and most spectacular, the waters plunging in a single drop of 46 feet as if from within the heart of the rock into a pool beneath.
The fall is created by the limestone geology of the hills through which the river has carved this gorge over countless millennia. The limestone was laid down 330 million years ago in what was the bed of an ancient, tropical sea.
The falls are on the Ingleton Waterfalls Trail.
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