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Law of Superposition
Sediments are deposited on top of preexisting sediments.
Stratgraphy is a relative dating method.
Levels and by extension, the artifacts, ecofacts and features contained in them can
be order through time based on stratigraphic position.
There are other methods known as absolute dating methods.
Potassium Argo Dating
Three ring dating of preserved wood.
Chronologies based on overlapping ring sequences.
Limitations – Cannot be used in tropical regions and confined to certain tree species.
Radioactive isotope or ‘variety’ of carbon, which forms in the atmosphere.
Absorbed by plants during photosynthesis.
Absorbed by animals when they eat plants.
After death, Celsius decays at a rate known- it’s ‘half life’ 5730+/-40years.
Libby’s calculations were based on a ‘curve of knowns’
Compared Egyptian tree-ring and historical data to radiocarbon samples.
Analysis and Interpretation.
“careful analysis of the environment in which materials are found in order to say
something about the circumstances by which that material came to be here” – Paul
Circumstances: natural and human agencies.
Conservation (May or may not be necessary, depends on the artifact class)