[snopercod]

The Grand Canyon would have been in violation of EPA non-point-source regulations had the EPA existed eons ago.

My suggestion is that we should find which ancient deep-pockets republican corporation is responsible for all that sediment and force them to remediate: FILL IT IN! </sarcasm>

[Rebelbase]

Interesting. I would like to see the estimates of area the reservoir encompassed. Must have been one huge lake if indeed it happened that way.

I think the Pleistocene flash flooding of Oregon and Washington State is a cool read, those ice dams at Lake Missoula must have been huge.

[RightWhale]

This is easy to imagine. The cut looks like fresh erosion. After all the change of heart on what caused similar features on Mars, it is not surprising to find some of the martian theories being reflected right back to earth.

[aimhigh]

"We don't have enough hard-core evidence to prove it one way or the other,"

They don't really know squat, except they are SURE it wasn't Noah's flood. Another example of our tax dollars at waste.

[JediGirl]

bump

[jlogajan]

I'm missing something here. The source amount of water is the same -- it is just that in one case it comes by massively, but for a short period. In the other case it comes by less massively, but over a far longer period of time. Shouldn't the erosion be the same. Or rather, shouldn't massive waters cut wide and shallow, while reduced waters over longer times cut narrow and deep?

[Publius6961]

new data indicating the canyon's Inner Gorge may be no more than 700,000 years old, much younger than earlier estimates of 3 million to 5 million years, said Robert Webb, a research geologist with USGS.

Damn!
I wonder how humans 700,00 years ago managed to mobilize and abuse the environment to that extent...
People are no damn good; a cancer on the planet.

They probly managed that while they were extinctioning the dinosaurs and producing massive clouds of greenhouse gases.
They all were homophobe and sexist and oh my gawd... probably smokers, the bunch of them.
Bah humbug.

I just might go extinction myself soon if this persists.
Shocking..

[Consort]

Uncivil engineers build damns.

[TomB]

bump

[Lancey Howard]

Catastrophic floods built Grand Canyon

Catastrophic? The result of some ancient sequester?