If you don't address the actual example, you can't claim to have shown me to be incorrect.
I don't even understand what you are trying to show with that example that is so suprising. All it is is an eroded syncline. So what? They are everywhere.
I am very sorry Faith but you continually make no sense. Mostly I am just responding to the parts of your posts that are just blatantly wrong like how sediments need to be soft when they fold.
You haven't shown the stress marks caused by the buckling in the Appalachians that you say are there when rock is bent or otherwise stretched, only in other places, you are merely asserting that such folding occurred in hard rock. Why not show the stress marks as you did in the other examples?
Well that is why I was telling you that the
rule is bent rocks are bent before lithification. If you need specific references for strain in the Appalachians then here is a few that I was able to dig up.
{ABE} Removed gsa link due to weirdness. {/ABE}
Strain in the Appalachian Plateau
This approached was used to map strain over 45,000 km2 of the Appalachian Plateau. The Devonian Catskill Delta of the Appalaachian Plateau contains many beds in which crinoid columnals parallel the bedding plane. Their elliptical shape on pavement surfaces testifies to the deformation of the Appalachian Plateau.
Evans K.F., Engelder T., Plumb R.A., (1989): Appalachian stress study 1: A detailed description of in-situ stress variations in Devonian shales of the Appalachian Plateau, J. Geophys. Res., 94, 7129-7154..
Evans K.F., Oertel G., Engelder T., (1989): Appalachian stress study 2: Analysis of Devonian shale core samples; Implications for the nature of contemporary stress variations and Alleghanian deformation, J. Geophys. Res.,94, 7155-7170.
Should be enough to convince you I hope. When rocks deform they always do so lithified. Once again, fact. Would you like me to find references that show that the sedimentary rocks of the Rockies were lithified before they deformed too or will you finally understand that we are talking about evidence that is pervasive? It is the rare occurrence that deformation happens to unlithified sediment. So rare that I try as I might I cannot even find an example on the internet of it happening. Maybe rox or someone can help with a good example of what it looks like when unlithified rock is put under tectonic stress. I can tell you one thing, it is not going to look like you neat syncline/anticlines of your Appalachian example.
Also, you apparently didn't look at the entire page at the link I gave, as your link merely repeats the same information there, and again fails to address the actual example of the Appalachians.
I did look at the whole page. What is there to address? What is so weird about it? Those kinds of formations are common. Did you expect me to be suprised by an example of a syncline?
Did YOU look at the whole page? Do you understand what a syncline is and how they form? If you don't then please ask because it seeming more and more like you really have no idea how to interpret geologic information. I will be happy to answer any questions you have about syncline formation. What is nice about that is their method of formation is entirely factual so once again we will be talking about facts rather than theory. No room to argue.
It is also a fact that the Appalachians HAVE BEEN eroded enormously from their original folded configuration, to judge by the link I gave, where it appears you only glanced at the road cut illustration and didn't see the diagrams of how the area was eroded.
I saw it just fine. I just don't know what the big deal is. That still doesn't address why the Appalacians "beat" the Rockies in terms of erosion given that the Rockies today are eroding faster than the Appalacians. if the Appalacians started out with more erosional potential than the Rockies then why did it continue as it has rather than slow down once it was eroded enough to reach the same potential as the Rockies. You have a race condition here that is impossible. Even if it rained 24/7 on teh Appalachians and there was no wind or rain at all on the Rockies you would still be hard pressed to erode millions of tons of granite and other types of rock over a couple thousand years since their formation.
One thing is for sure. You are better off proposing some kind of other outrageous, mid/post flood craziness for why those two ranges look the way they do in comparision because the alternative that the Appalachians simply eroded faster post flood is a no go.
{ABE}Tried to fix the gsa link, failed. {/ABE}
This message has been edited by Jazzns, 09-09-2005 02:27 PM
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