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Unformatted text preview: amount of uranium in surrounding area and explosion to determine date 3. indirect dating method D) Seasonal markers 1. Dendrochronology (8,200 y.a. to current; here in SW 6,000 y.a.) location, species sensitive 2. Obsidian Hydration- when obsidian is broke open it starts absorbing hydration band (only accurate if local temp. does not vary more or less than 10 degrees (only good at equator) 3. Magnetic Changes- composition of Earth has created a magnet (archaemangnetism 4,000 y.a.)- Magnetic north varies and this change is registered in various different iron rich features ie. Hearths, kilms, clay tiles EXAM WILL BE ON TUESDAY (questions taken from student tests online) GLOBE QUESTION FROM CHP. 5 about dates...
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- Fall '06