Underlying the dolomite is the less resistant Rochester Shale.

Waters pounding from above, wash the shale away, undercutting the brittle dolomite, eventually leaving huge blocks hanging out over the water.

Thankfully that Flood will never be repeated, and lies beyond even our imagination.

Thankfully also, Niagara Falls helps us grapple with these thoughts, expanding our feeble imaginations.

Let's apply this simple technique to Niagara Falls.

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A precipitous cliff can be seen at Queenston, on either side of the river, marking the end of the ravine.

One gets the distinct impression that the falls were once here, and have eroded the ravine upstream for seven miles to reach their present location.