prop. n. A large waterfall on the Niagara River near Buffalo remarkable for the volume and constancy of the water flowing over it. That part of the waterfall in Canada is the Horseshoe Falls; the U. S. portion is called the American Falls. [ WordNet 1.5 ]
(Geol.) A subdivision or the American Upper Silurian system, embracing the Medina, Clinton, and Niagara epoch. The rocks of the Niagara epoch, mostly limestones, are extensively distributed, and at Niagara Falls consist of about eighty feet of shale supporting a greater thickness of limestone, which is gradually undermined by the removal of the shale. See Chart of Geology. [ 1913 Webster ]
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