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Slithy_Tove · 02-12-2003, 12:19 AM

Okay, seriously, folks.

The escarpment on the left, with the rivulents leading away from it looks like a lot of the features in the 'basin and range' area of Colorado, Nevada and Utah. When I drive from Vegas to the Grand Canyon area, a lot of the geography inbetween looks like this.

The rising up of that escarpment, and its erosion by liquid, presumably water, must have happened fairly recently, or it would have been destroyed by meteor strikes, c.f. the earth's moon. What 'recently' means, I don't know. A million years? A hundred million? Definitely less than a billion, I'd guess, but I don't know enough of exogeology to be sure.

02-12-2003, 12:19 AM	#10
Slithy_Tove Disorderly Orderly Join Date: Jun 2001 Location: Philly 'burbs, PA, USA Posts: 52	Okay, seriously, folks. The escarpment on the left, with the rivulents leading away from it looks like a lot of the features in the 'basin and range' area of Colorado, Nevada and Utah. When I drive from Vegas to the Grand Canyon area, a lot of the geography inbetween looks like this. The rising up of that escarpment, and its erosion by liquid, presumably water, must have happened fairly recently, or it would have been destroyed by meteor strikes, c.f. the earth's moon. What 'recently' means, I don't know. A million years? A hundred million? Definitely less than a billion, I'd guess, but I don't know enough of exogeology to be sure. __________________ == Tove A rainbow rat, a checkered cat...