The waterfall and gorge comprise an example of a hanging valley, formed where Taughannock Creek’s stream-carved valley meets the deeper glacially carved valley that contains Cayuga Lake.
The gorge has continued to retreat westward from Cayuga Lake as easily eroded shale near the fall’s base is worn away by the stream, which supports erosion-resistant siltstone and sandstone found in the upper portions of the gorge.
Annual freeze and thaw cycles also act upon small faults in the rock, causing large sections to occasionally break away, further expanding the gorge.
Taughannock Falls’ main cataract is a 215-foot drop (66 m), making it 33 feet (10 m) taller than Niagara Falls. It is the tallest single-drop waterfall east of the Rocky Mountains. The waterfall is located along Taughannock Creek, which flows through a long gorge with cliffs up to 400 feet (120 m) high.
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Michael Stephen Wills Photography 