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From The Collaborative International Dictionary of English v.0.48:
Oriskany \O*ris"ka*ny\, a. [From Oriskany, in New York.] (Geol.) Designating, or pertaining to, certain beds, chiefly limestone, characteristic of the latest period of the Silurian age. [1913 Webster] Oriskany period, a subdivision of the American Paleozoic system intermediate or transitional in character between the Silurian and Devonian ages. See Chart of Geology. [1913 Webster]