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15 feet 20 feet Aiken County Bayley bond clays Bull Clay Deposits clay under coal clays are found clays fuse Clays Occurrence Properties clays Ref Clearfield County coal is found Columbiana cone 27 cone 30 cone 30 Ref County Ref Creek Eastern United Fayette County feet in thickness feet thick fire brick fire clay fire clay bed flint clay flinty and plastic formation Freeport coal fuse between cones fused at cone fuses around cone fusion point fusion temperature fusion test Geol Henry County High Grade Clays Hocking horizon Jackson County Jour kaolin Latah County Lawrence County localities Lower Kittanning Marion County miles west mined Ohio pegmatite Perry Personal Communication plastic clay Questionaire Circular Refractories Fellowship refractory clays residual clays Ries rocks Scioto counties semi-flint clay Somerset County Somerset County fused test of cone thickness varies Third Edition Tuscarawas underclay Utah County varies in thickness Vinton