oriskany

Century Dictionary and Cyclopedia

1. n. In the geology of New York, an arenaceous or calcareo-arenaceous member of the rock series, in the eastern part of the State lying above the Helderberg limestones and below the Esopus and Schoharie grits, in the western part lying above the Waterlime series, with which it is unconformable, and beneath the Onondaga limestone. It extends southward along the Appalachians in New Jersey. Pennsylvania, and Maryland, and westward into the Ohio valley. It is profuse in fossils and those of the more arenaceous littoral deposits are usually of large size. The formation belongs to the early Devonian.

GNU Webster's 1913

1. adj. (Geol.) Designating, or pertaining to, certain beds, chiefly limestone, characteristic of the latest period of the Silurian age.