Radiometric dating def
Continental shield, any of the large stable areas of low relief in the Earth’s crust that are composed of Precambrian crystalline rocks.
The age of these rocks is in all cases greater than 540 million years, and radiometric age dating has revealed some that are as old as 2 to 3 billion years.
The one on the bottom was millions of years younger than the one on the top.
This proves that radiometric dating is inaccurate and should not be relied upon." Rebuttal: One wonders whether the "slab of stone" from the bottom of the canyon might have simply fallen from the top within the last few centuries?
The The southern two-thirds of peninsular India, most of the western half of Australia, and the eastern segment of Antarctica are also areas of continental shields.
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Results from any measurement contain a degree of error.
Suppose that radiometric analysis of this type of stone is typically accurate within 2%.
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In this particular case, the radiometric measurement was apparently made on whole rocks.