Argon argon dating accuracy

Etna basalt, Sicily (May 1964) 0.7±0.01 Ma Medicine Lake Highlands obsidian, Glass Mountains, California ( in the 1800-1801 Hualalai flow, Hawaii, resided in fluid and gaseous inclusions in olivine, plagioclase, and pyroxene in ultramafic xenoliths in the basalt, and was sufficient to yield "ages" of 2.6 Ma to 2960 Ma.

Coral growth patterns are also seasonal and provide a long independent date history. The dates obtained by different radiometric isotope pairs cross-check each other.

Thus all K-Ar and Ar-Ar "dates" of volcanic rocks are questionable, as well as fossil "dates" calibrated by them.

Ar Analyses of Historic Lava Flows.” Nevertheless, this is no way changes the argument in question.

While the apparent ages might be slightly different, they are still excessive because of excess argon and are in the same ballpark as those listed above.

So the argument that excess argon produces erroneous apparent ages is still correct.

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For example, the C14 concentration in the atmosphere depends upon cosmic ray intensity.

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