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Entry 1 sense Webster, 1913

Cincinnati epoch

/sĭnˌ-sən-ăt'-ē ĕp'-ək/ · Cin·cin·na·ti ep·och · IPA
01 An epoch at the close of the American lower Silurian system. The rocks are well developed near Cincinnati, Ohio. The group includes the Hud…
  1. 1.
    An epoch at the close of the American lower Silurian system. The rocks are well developed near Cincinnati, Ohio. The group includes the Hudson River and Lorraine shales of New York.(Geol.)