·- 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.
·noun The date at which a planet or comet has a longitude or position. II. Epoch ·noun A division o...
Webster's Dictionary of the English Language
The time to which certain given numbers or quantities apply. ...
The Sailor's Word-Book
·- An epoch at the close of the Canadian period of the American Lower Silurian system; — so named f...
·- The closing subdivision of the Hamilton period in the American Devonian system; — so called beca...
·- A subdivision of the Niagara period in the American upper Silurian, characterized by the formatio...