Hamilton period : 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.

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Taxonomy
Hamilton period, Everything2, Devonian system, Nodes, od, subdivision, America, Madison Co, New York, Marcellus, Genesee, epochs, Y'know, something here, Epicenter, sibling, Writeups, Webster 1913.

Defination from the web:
Hamilton period (definition) by Webster 1913. Wed Dec 22 1999 at 0:03:26. Ham"il*ton pe"ri*od (?). Geol. ... It includes the Marcellus, Hamilton, and Genesee epochs or groups. See the Chart of Geology. © Webster 1913. (unvotable) (I ...