lakeview rud, on 15 February 2010 - 09:49 PM, said:
Sorry Swede, but I cannot buy your argument that these are "naturally" created. First why would some tops be sheared off and others supposedly of the same vintage be unaffected? Secondly, why would they end up being pretty much perfectly horizontal when you would expect that in a mountainous region there would definitely be tilting of the rock strata? Thirdly, the fact that the Nazcans chose to do their lines on top of one of these things (the airport looking one) hints very strongly that they had something to do with its creation.
lakeview - While I can appreciate your position, I believe it would be of assistance to your understanding of the situation to study geologic/hydrological processes and the area under consideration in more detail. I realize that the following will be redundant, be it may help.
1) The formations pictured are not mountains. A bit of simple scaling on the plateaus themselves will verify this. As can be observed in Riaan photo #6, the true mountains can be observed in the background. At a notably higher altitude. The Nazca Plains (Peruvian Plains) are named so for a reason. In addition, the erosional processes are readily apparent to anyone that has observed spring run-off on the the shoulders of a dirt road. Similar "high plains" are rather common in the western U.S., a region in which I have personally observed similar processes. The photos of the Badlands of South Dakota which I supplied a link to are areas that I have, again, personally walked and researched. The same would apply to areas in the Four Corners. Have you actually studied the formational processes involved in the plateau structures utilized by the Ancestral Puebloans (Anassazi)?
2) The erosional processes, as has been pointed out, are readily apparent. The long term effects of the subduction of the Nazca Plate under the South American Plate results in an upward shifting/tilting of some areas that allows the down-cutting to continue.
3) Rest assured that this is not solely "my argument". I am merely providing well documented geologic information that I would hope would put the fallacious proposals of some "authors" into a scientifically balanced perspective.
My best suggestion would be to pull up all the references which have been previously provided, including all those available via Science Digest (This may require access to a good library). And, as also suggested, utilize Google Earth to get a larger field of view. To isolate features from their broader matrix can result in an inaccurate assessment of their over-all formational ancestry.
Hope the above is of assistance.
.