On viewing this photograph my wife, Pam, noticed the shapes eroded from the sedimentary rock of Taughannock gorge. These layers of shale, sandstone, siltstone formed at the bottom of a broad, shallow sea over 380 million years ago. Differential wearing of these rock layers, clearly visible in this photograph, resulted in these formations, including the three sisters and overhangs.
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Three Sisters, Taughannock Falls gorge wall.
Three Views from The Bend
Taughannock Gorge, November 
Into the Gorge Three Sisters, Taughannock Falls gorge wall.
