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Grand Canyon Lava Flows: A Survey of Isotope Dating Methods The Rb-Sr ratios in various rock samples from the same lava flow might differ, but all 5 One K-Ar "model age" determination gave 1.2 ± 0.2 million years6 for the lava dam, Six Pleistocene lavas from Uinkaret Plateau (Stages III and IV of Hamblin's later 

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