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Moreover, many of Dorn's arguments remain erroneous: his own carbon dates must be false, he said, because the cosmogenic radiation nuclide results from the same panels demonstrate that they ''should be infinite'' (Dorn, 1997: 106).
While the gaseous emissions of volcanic eruptions may age a sample, major forest or grass fires may make it appear younger, and past variations in cosmogenic radiation may have either effect.
Cosmogenic radiation nuclides
The production rates of the radionuclides in a rock surface layer that result from cosmogenic radiation are variable according to topographic exposure, altitude, latitude, oscillations in radiation, overburden and time.
Cosmogenic radiation analysis has been applied at a rock art site, Penascosa in the Coˆ a valley, northern Portugal (Phillips et al.
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