Nov. 29, 2012 — An analysis of mineral grains from the bottom of the western Grand Canyon indicates it was largely carved out by about 70 million years ago -- a time when dinosaurs were around and may have even peeked over the rim, says a study led by the University of Colorado Boulder. The new research pushes back the conventionally accepted date for the formation of the Grand Canyon in Arizona by more than 60 million years, said CU-Boulder Assistant Professor Rebecca Flowers. The team used a dating method that exploits the radioactive decay of uranium and thorium atoms to helium atoms in a phosphate mineral known as apatite, said Flowers, a faculty member in CU-Boulder's geological sciences department.
http://www.sciencedaily.com/releases/2012/11/121129143301.htm
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Re: Grand Canyon as Old as the Dinosaurs: Dates for Carving of Western Grand Canyon Pushed Back 60 Million Years
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