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Anthony kill bank basal Beekmantown boulders Bucks Bridge Bulletin calcareous Cambrian Canton Canton quadrangle channel clay and sand coarse Cohoes quadrangle color course crystalline depressions Doctor Ulrich dolomite drumlins east erosion erosion terraces evidence exposures falls feet formation Geol Geological glacial lake gneiss gorge Grass river Grenville Heuvelton Hewittville Hoosic delta Hoosic river Hudson valley ice lobe ice sheet Iroquois-Mohawk lacustrine Lake Albany waters lake waters later layers ledge limestone lower terrace margin mass materials Mechanicville miles mixed beds Mohawk river moraine Museum N. Y. State Mus Ogdensburg outcrops outliers Paleozoic peneplain plain plate Pleistocene portion postglacial Potsdam village Precambrian preglacial present quarry quartzite Raquette river region Rep't rock surface sand and gravel sandstone Saratoga Schaghticoke sediments shale slope soils southward St Lawrence strata stream subsidence summit thickness tion Tomhannock topographic uplands upper terrace Waterman hill weathering York