Medical Definition of Niagara period
1.
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.
Source: Websters Dictionary
(01 Mar 1998)
Lexicographical Neighbors of Niagara Period
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