STUDY GUIDE ANTHROPOLOGY 100 #2
Ground Penetrating Radar (GEOPHYSICS)
Form of finds
Process of Change
Washington State Department of Archaeology and Historic Preservation
Relative Dating Techniques
Law of Superposition
Absolute Dating Techniques
(but they don’t guarantee a good date)
Dendrochronolgy Tree ring dating
Requires timbers with relatively clear rings
Limited records (few thousand years 10,000 at most)
Dated Materials Rare but wonderful
Documentary Evidence Rare but wonderful
Carbon 14 HL 5730 yr Limit 60-70,000 yrs ratio of Carbon 14 to 12 in burned sample
Ratio of Potassium 40 to (Argon 40 and Calcium 40)
(Must have Potassium 40 (igneous to start with)
Fission Track Dating HL (NA) Limit 20 to 5 Billion yrs ago
Counting number of Uranium 238 tracks through material
Obsidian Hydration NA !!!!No longer Considered Accurate!!!
Works on measuring crust formation on outside of obsidian, caused by dehydration
Measure direction of Earth’s magnetic field and compare to a chart.
Not very specific (+ or – 50-100,000 years)
When Ceramics are fired, Thermal energy is released. As pottery ages, it recollects new energy as it ages.
Object is fired and Thermoluminescence is measured.
Also useful for soil dating