Erosion of buildings on geological timescales

I'm looking at a science fiction scenario similar to Lovecraft's At the Mountains of Madness where buildings are exposed to the elements for millions of years. I have a feeling they wouldn't be quite as intact as Lovecraft had it, so I want to try to figure out what's realistic.

As in Lovecraft, the location is a geologically stable plateau that is very dry and permanently below freezing point so no earthquakes, volcanoes or water.

What would be left after one, ten, a hundred million years? For the purposes of the story, I don't need them to be usable, just to have enough remains for investigation by archaeologists.

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Erosion of buildings on geological timescales

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