[NMCAVER] Age Dating of Cave Minerals Demonstrate that Grand Canyon Older Than Previously Thought

[Scott Christenson]

Congratulations to Drs. Polyak, Hill, and their colleagues. The articles
appear in both Science and The New York Times.

http://www.nytimes.com/2008/03/06/science/06cnd-canyon.html?ex=1205470800&en=3ba76f65c95f858f&ei=5070
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