Re: Mountains

 George wrote:

"Jo Schaper" <joschapern4ospam@xxxxxxxxxxxxxxxxx> wrote in message news:11hndq9hjmhc172@xxxxxxxxxxxxxxxxxxxxx

Hank Oredson wrote:


"don findlay" <don@xxxxxxxxxxxx> wrote in message news:1125555935.622526.72550@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx


...So if mountains are formed by the erosion of plateaus, leaving an 



They are not.
Thus the rest of your post is incorrect.


Sorry, I have to agree with this snippet by Don Findlay taken out of context. Some "mountains" (or hills at least) are formed by the dissection of karst plateaus. Geomorphology has advanced beyond classic William Morris Davis 4 stage erosion cycle, but when you've got a cave in one hill, an intervening valley, and another cave at the same level in the next hill, and it is all flat-lying carbonate strata , there isn't any other reasonable explanation but the erosion of a plateau forming the hills containing the caves.


Yes, but the erosion of a karst plateau resulting in the formation of hills in regions of essentially flat-lying limestone beds (such as in Missouri and Kentucky) is not the same as uplift in a orogenic mountain belt. As you know, the vast majority of karst regions are unlain by marine limestone, so there has to be some form of regional uplift to form the plateau in which the karst later forms. And with Karst seen in the Blue Ridge of Virginia and the easternmost Appalachians in West Virginia and Maryland, karst landscapes form after the marine limestone formed in a shallow carbonate ramp environment undergoes orogenic uplift and the resulting faulting, folding, and deformation. Thus, when you walk through many of the caves in that region, the passages are often cut across beds that have dips of up to 50 degrees, evidence that the karst formed after the mountains were uplifted, faulted and folded.



I know all that, which is why I constrained my argument to 'some mountains or hills' in flat lying carbonate strata. Don's argument does not explain all mountains and hills by any means.
.

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