K-Ar ages of Pleistocene lava dams in the Grand Canyon in Arizona.

  title={K-Ar ages of Pleistocene lava dams in the Grand Canyon in Arizona.},
  author={G. Brent Dalrymple and W K Hamblin},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  volume={95 17},
At least 13 times during the Pleistocene Epoch lava flowed into the inner gorge of the Grand Canyon and formed lava dams, as high as 600 m, that temporarily blocked the flow of the Colorado River. K-Ar ages on these lava dams indicate that the seven youngest formed within a short period of time between about 0.6 and 0.4 mega-annum (Ma). The physiography of the lava dam remnants within the canyon shows that each dam was destroyed by erosion, the Colorado River rapidly reaching its pre-existing… CONTINUE READING

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