Karl - Liberal Backslider
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- Jul 16, 2003
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Smidlee said:Not when there is still geologic columns on the surface of even mountains. I remember reading a few months ago where scientist are starting to admit all our mountains are very young compare to their time table. So it true some mountains has upthrust that equals or surplus the erosion rate (which is higher on mountains) yet still have geologic layers on the top of these mountains. Of course they are still using milions but I've notice the mountains and the Grand Canyon are getting younger and younger.
In order for these geologic columns to still exist you got to have a lot of dirt be replaced on top of these layers not just uptrust.
Some mountains are made up of folded strata, rather than having strata "on top" of them. Rather than the model you seem to be suggesting, whereby you have mountains and valleys with strata over them like several blankets, rather you have a pile of blankets that have been squashed together to make irregularities. There are not great layers of strata "on top" of mountains as if the mountains were seperate from the strata. In other words, the strata came first, and were folded into mountains, rather than the mountains forming first and being overlaid with strata. Mountains tend to be where sediment comes from, rather than where it ends up.
I think we've always known that many mountain ranges are relatively young - the pointier ones tend to be, for obvious reasons. So the Alps and the Himalaya, formed from plate collisions, are young, as are the volcanic Icelandic mountains and the Hawaiian islands. On the other hand, the relatively eroded and gentler Cumbrian (England) and Grampian (Scotland) mountains are far older.
I'd be interested if you could actually provide some examples of actual dates for given mountain ranges being revised in recent years.
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