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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…

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  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.
  2. 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.
  3. A subdivision or the American Upper Silurian system, embracingthe Medina, Clinton, and Niagara epoch. The rocks of the Niagaraepoch, mostly limestones, are extensively distributed, and at NiagaraFalls consist of about eighty feet of shale supporting a greaterthickness of limestone, which is gradually undermined by the removalof the shale. See Chart of Geology.