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19 Cards in this Set
- Front
- Back
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direct dating
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date object
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indirect dating
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analysis of material associated with object
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relative dating
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age of object relative to one another
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fluorine dating
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relative age of bones (Piltdown man)
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contextual seriation
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based on style used with stratigraphy (change over time)
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frequency seriation
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based on changes in proportional abundance of artifact style
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linguistic dating
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based on changes in language after groups separate
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glottochronology
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measures similarity of languages to determine time apart
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ice cores
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take from polar ice, can measure 10,000's of years, idea of climatic events
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dendrochronology
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1930, annual tree growth/master sequences
9,000 yrs in SW >10,000 in W Europe REGIONAL |
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radiocarbon dating
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decay of c-14 in organic substances
-half-life is 5370 yrs -can date up to 50,000 yrs ago -not exact dates |
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K-Ar / Ar-Ar
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decay of K to Ar
-volcanic rocks from 100,000 to millions of years old -early hominid sites (Olduvai Gorge) |
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Uranium
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-dates CaCo3 rocks from 50,000-500,000 yrs ago
-early human sites (Qatzeh) |
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Fission-track
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dates variety of minerals from 300,000-million years ago
-hominid sites |
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thermoluminescence
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-dates pottery/heated stone
-measures radiation from trapped e- -dates from modern to 100,000 yrs ago |
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obsidian hydration
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hydration layer can be measured
-dates to MILLIONS of years ago |
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e- spin resonance
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dates teeth
-100,000 to 1 million yrs ago |
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amino acid racemization
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bones/egg shells
< 100,000 yrs ago |
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cation ratio
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dates rock art, < 20,000 yrs ago
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