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We found 7 dictionaries with English definitions that include the word niagara period: Click on the first link on a line below to go directly to a page where "niagara period" is defined. General (6 matching dictionaries) niagara period: Wordnik [home, info] Niagara period: Dictionary.com [home, info] Niagara period: Online Plain Text English Dictionary [home, info] Niagara period: AllWords.com Multi-Lingual Dictionary [home, info] niagara period: Free Dictionary [home, info] Niagara period: Dictionary/thesaurus [home, info] Medicine (1 matching dictionary) niagara period: online medical dictionary [home, info]

Quick definitions (niagara period) () 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. (This definition is from the 1913 Webster's Dictionary and may be outdated.)