The Great-Grand Canyon?

Recent reports peg the Grand Canyon at about 10 million years older than previously thought. The mistake, attributed to a faked Arizona driver's license, was discovered when the vast, expansive geologic formation, which purported to be "6 million if an eon," was noticed eroding on federal land. After routine carbon dating, the awe-inspiring chasm was found to be closer to 17 million years of age.
The gorge, which was released on its own recognizance, promptly exposed a calcite deposit to a family of passing tourists.