niagara period definition

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    • A subdivision or the US Upper Silurian system, adopting the Medina, Clinton, and Niagara epoch. The stones regarding the Niagara epoch, mainly limestones, are thoroughly distributed, and also at Niagara Falls consist of about eighty feet of shale promoting a greater depth of limestone, that will be slowly undermined by the elimination of the shale. See Chart of geology.
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