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The conventional K-Ar dating method was applied to the 1986 dacite flow from the new lava dome at Mount St. The whole-rock age was 0.35 /- 0.05 million years (Mya). Excess argon within mineral concentrates from the New Dacite Lava Dome at Mount St. Creation Ex Nihilo Technical Journal 10(3): 335-343. module=research&action=index&page=researchp_sa_r01 Henke, Kevin R.

Ages for component minerals varied from 0.34 /- 0.06 Mya to 2.8 /- 0.6 Mya.

The results came back dating the rock to 350,000 years old, with certain compounds within it as old as 2.8 million years. Austin's conclusion is that radiometric dating is uselessly unreliable. Austin chose a dating technique that is inappropriate for the sample tested, and charged that he deliberately used the wrong experiment in order to promote the idea that science fails to show that the Earth is older than the Bible claims.This sparks the question: what other layered sedimentary rocks in earth's crust were formed rapidly?The mountain also provided a clear reason to distrust the reliability of radiometric dating.This is despite the fact that it causes more problems for interpreting rock strata than it solves.And today we know through lab experiments and natural disasters (such as the eruption of Mt. Helens) that major layering of rock strata can happen catastrophically in a short period of time.Why does the lava dome provide an opportunity to test the accuracy of radioisotope dating? First, radioisotope-dating methods are used on igneous rocks—those formed from molten rock material. Fossil-bearing sedimentary rock cannot be directly dated radioisotopically.