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If it dates too young, one can invoke a later heating event.

Dr Giem see references below has been able to find only two published papers.

Then we can average them to get an average age for this rock.

This shows that excess argon is entering these rocks by some means, and calls K-Ar dating into question.

Dating mechanisms such as Carbon-14, work within the creationary paradigm without the need of having a change in half-lives.

If the rock was heated in the presence of Argon from the earth's mantle, or perhaps in some primordial Argon which might have had a higher concentration of Ar 36; we might have problems making this assumption.

Of course, it could be that older measurement techniques were less accurate.

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The a- alpha particles emitted at high velocity by the disintegrating nuclides interact, because of their charge, with electrons of surrounding atoms which slow them down until they finally come to rest in the host material at a distance from their source that depends on their initial kinetic energy and the density and composition of the host.

Two field examples: the first in the Columbia River Basalts, the second in the Yellowstone Fossil Forest will be given as well.