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The potassium-argon dating method has been used to measure a wide variety of ages.The potassium-argon age of some meteorites is as old as 4,500,000,000 years, and volcanic rocks as young as 20,000 years old have been measured by this method.

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The calcium-potassium age method is seldom used, however, because of the great abundance of nonradiogenic calcium in minerals or rocks, which masks the presence of radiogenic calcium.

On the other hand, the abundance of argon in the is relatively small because of its escape to the atmosphere during processes associated with volcanism.

The amount of Argon sublimation that occurs is a function of the purity of the sample, the composition of the mother material, and a number of other factors.

These factors introduce error limits on the upper and lower bounds of dating, so that final determination of age is reliant on the environmental factors during formation, melting, and exposure to decreased pressure and/or open-air.

It's a major operation." 3,000 YEAR-OLD FEMALE STATUE UNCOVERED IN TURKEY Frieman said she found a sandstone grinding stone at Rach Nui that is believed to have come from a quarry more than 50 miles away.

"The Rach Nui region had no stone resources,” she said, “so the people must have been importing the stone and working it to produce the artifacts.

method is based upon the decay of radioactive potassium-40 to radioactive argon-40 in minerals and rocks; potassium-40 also decays to calcium-40.

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