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Unformatted text preview: Moraines in US-Wisconsin same time Wurn-Illinoian same time Riss-Kansan same time Mindel-Nebraskan same time Gutz in order from youngest to oldest Oxygen isotopes-Normal oxygen has 8 neutrons and 8 protons, molecular weight of 16-Small fraction of O2 has 2 extra neutrons thus is oxygen 18-So in water we can hve this normal H20 or heavy water H218O-Harder to evaporate heavy isotopes, so left behind-Easier to precipitate heavy isotopes, vapor is lighter again...
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- Spring '07