Hamilton period /(hăm"ĭl*tŭn pē"rĭ*ŭd)/

Ham·il·ton pe·ri·od

Hamilton period
  1. A subdivision of the Devonian system of America; -- so named from Hamilton, Madison Co., New York. It includes the Marcellus, Hamilton, and Genesee epochs or groups. See the Chart of Geology. (Geol.)