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Earth's magnetic field is constantly changing, iron particles take up permanently the earth's magnetic direction at time of firing clay structures.
Artifacts, features, or structures dated at a particular site have somehow to be related to the historical chronology, perhaps by association with inscription referring to ruler of time.
Application of a correction equation to convert radiocarbon years into calendar years-Most reliable calibration based on: -Dating of annual tree rings (but only goes back to ca.
Seriation, also called artifact sequencing, is an early scientific method of relative dating, invented (most likely) by the Egyptologist Sir William Flinders Petrie in the late 19th century.
Independent method of absolute dating in its own right.
Rings become narrower with age, amount of growth affected by fluctuations in climate Sequence of tree-ring widths is perfectly unique to a sequence of growing seasons.-Limitations -Right species -Seasonal variation -Rings well preserved -Sample 1.
Also records from ANY organic material Total amt of C does not change until organism dies, C decays Max range of radiocarbon dating is appx. Critical assumption: amount of radiocarbon produced in upper atmos. Appropriate for dating early human sites Only viable radiometric technique for dating very old archaeological materials Technique based on measuring the ratio 40Ar/40K in a sample -Assuming that there is no 40Ar present at the beginning -Ratio increases as age increases; 40Ar increases and 40K decreases as 40K decays-Have to assume NO 40Ar in rocks...