The Ice Age in North America: And Its Bearings Upon the Antiquity of Man

accumulation Allegheny amount basin border bowlders channel clay coast continuous covered Creek depth distance drainage drift east eastern elevation erosion evidence extended facts farther feet above tide feet high fiords formed Fort Snelling front Geological Survey glacial boundary glacial débris glacial deposits Glacial epoch Glacial period glaciated area glaciated region gorge gravel Greenland height hills hundred feet Ice age ice-front ice-sheet icebergs inlet Island Journal of Science kames kettle-holes Kittatinny Mountain Lake Agassiz Lake Erie Lake Superior land latitude loess lower Malaspina Glacier margin marked mass material melting miles Minnesota Mississippi mountains movement Muir Glacier Muir Inlet nearly northern northward numerous Ohio Ohio River pebbles portion preglacial present Professor Report ridges River rock rocky sand shore side slope southern square miles subglacial stream summit surface terminal moraine terraces theory thickness thousand feet tion upper valley vicinity