>"Grim Reaper" <[email protected]> wrote:
>HOW OLD IS THE GRAND CANYON? PARK SERVICE WON'T SAY - Orders to
>Cater to Creationists Makes National Park Agnostic on Geology
Hm... And yet, from the National Park Service web site...
How old is the Canyon?
That's a tricky question. Although rocks exposed in the walls of the
canyon are geologically quite old, the Canyon itself is a fairly young
feature. The oldest rocks at the canyon bottom are close to 2000
million years old. The Canyon itself - an erosional feature - has
formed only in the past five or six million years. Geologically
speaking, Grand Canyon is very young.
Are the oldest rocks in the world exposed at Grand Canyon?
No. Although the oldest rocks at Grand Canyon (2000 million years old)
are fairly old by any standard, the oldest rocks in the world are
closer to 4000 million years old. The oldest exposed rocks in North
America, which are among the oldest rocks in the world, are in
- Dale Gombert (SkySea at aol.com)
122.38W, 47.58N, W. Seattle, WA