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Adiron Adirondack area Adirondack mountains Adirondack region altitudes anorthosite Ausable Black River valley border Cambrian Champlain cleavage Clinton county color crystals dacks drainage early Paleozoic earth eastern Essex county fault feet above sea feldspar flow fracture gabbro garnet glacial debris glacial deposits glacial lake gneisses gorge grained granite graphite Grenville gneisses Grenville rocks Grenville strata Hamilton county Ice Age ice sheet igneous rocks Indian iron irregular known Lake George Lake Placid Lake Pleasant land layers limestone Little Falls Long lake masses mica miles long minerals Mohawk valley molten moraine N. Y. State Geol nearly northern New York Ordovician Paleozoic Paleozoic strata peneplain portion Potsdam preglacial pyroxene quadrangle quartz Raquette lake Raquette river Rep't ridge Sacandaga sand sandstone Schroon Lake sea level sediments shales side southeastern Adirondacks St Lawrence valley stratified streams surface syenite syenite-granite throughout the Adirondacks topographic vicinity Warren county