·- A subdivision of the Niagara period in the American upper Silurian, characterized by the formations known as the Oneida conglomerate, and the Medina sandstone. ·see the Chart of Geology.
·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...
·- An epoch at the close of the American lower Silurian system. The rocks are well developed near Ci...
·- The closing subdivision of the Hamilton period in the American Devonian system; — so called beca...