Rock dating

These included seven samples from a 150 meter long and 2 meter wide amphibolite body outcropping just upstream from the mouth of Clear Creek at river mile 84 (measured from Lees Ferry).

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The best isochron plots, where all the variation from the line of best fit to the data incorporates all the analytical errors, yielded an Rb-Sr isochron age of 1240±84 Ma, an Sm-Nd isochron age of 1655±40 Ma, and a Pb-Pb isochron age of 1883±53 Ma.

These are former sedimentary and volcanic strata that have been transformed by heat and pressure, possibly during the intense upheavals when the dry land was formed on Day 3 of Creation Week.

Among these metamorphosed volcanic strata are amphibolites, belonging to the Brahma Schist.

Both laboratories use standard, best-practice procedures on state-of-the-art equipment.

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The model K-Ar ages for each of the samples ranged from 405.1±10 Ma to 2574.2±73 Ma.These were originally basalt lava flows several meters to tens of meters thick.

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