The Collaborative International Dictionary of English v.0.48:

Schoharie grit \Scho*har"ie grit`\ (Geol.)
   The formation belonging to the middle of the three
   subdivisions of the Corniferous period in the American
   Devonian system; -- so called from Schoharie, in New York,
   where it occurs. See the Chart of Geology.
   [1913 Webster]