- Jun 4, 2013
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Ok the rate of denudation for the US as a whole is 2.4 in / 1000 years.
If you have 15,000 feet of paleozoic bedrock, how many thousands of years would it take for your rock to erode away?
Can you do this math?
What if I told you that proterozoic and archean rock has been exposed at the surface and makes up a large portion of north america as well?
If you take 50,000 feet of rock, and you eroded through that rock at 2.4 inches every 1,000 years...
50,000ft * 12 inches per foot is 600,000 inches.
600,000/2.4 inches = 250,000
250,000 inches * 1000 years = 250,000,000 years.
So assuming no uplift ever occurs, we might expect north america to not exist after 250 million years?
Well, uplift has been occurring over the last 250 million years.
Really, this argument you're making sounds like something a preschooler would come up with, because nobody in their right mind would ever be able to simplify something like the water cycle into such a simple argument.
Its just silly.
Only one problem with both of your arguments.
Ruins a mere 1,000 years old have to be excavated from beneath the surface.
So actual layering rates falsify your belief in how long it takes to build up and his in how long it takes to erode....
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