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Other methods include: coin dating, seriation, and amino-acid racemization.The methods have varying applications, accuracy, range, and cost.Many new techniques are being developed and tested.

Ordering of artifacts according to their frequencies so that the distribution conforms to a "battleship-shaped" curve.

Drawback: some minerals don't capture sufficient amounts of sunlight, therefore are dated as older... Based on principle that when volcanic obsidian is fractured, it starts absorbing water from its surroundings, forming a hydration layer that can be measured.

No universally valid rate of growth or hydration rate. Does not give info about date of a rock engraving, but about the length of time that the rock surface in Q has been exposed since the geological even leading to dating.

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...

certain volcanic rocks that have been heated to melting point.

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