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Adirondack region altitude Appalachian Atlantic basin beds Cambric Catskills Champlain channel Clarke Cretacic Cretacic peneplain deep deposits Devonic drainage eastern Economic Geology elevation Entomology Erie escarpment faulting feet figure Finger lakes flowed folded formations formed fossils Geologic Map GEOLOGICAL HISTORY glacial lakes gorge Grenville Helderberg Highlands Hudson river Hudson valley Ice age ice erosion ice sheet igneous rock Island Lake Ontario land layers limestone Little Falls lower masses Mesozoic miles Mohawk river Mohawk valley moraine mountains N. Y. State Geol N. Y. State Mus Niagara northern New York Ordovicic Paleontology Paleozoic peneplain period plain Plate portion postglacial Potsdam Precambric rock preglacial present province quadrangle Rep't Report retreat ridges sandstone sea level sediments shales Shawangunk Siluric southeastern New York southern southward Southwestern plateau St Lawrence streams surface Susquehanna Taconic Tertiary tilt topographic Trenton Triassic Tug Hill uplift Upper upraised western New York westward