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Mere assertion.
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The lake would have dried up by now if it were millions of years old.
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Do the docks face the lake? How do you know the lake predates the city?
Didn't you take a look when you were there? Or are you just asking rhetorically? Because hardly anyone seems to doubt that the docks were used for ships on Titicaca in the last millenium or two. It's such an obvious conclusion that a reasonable doubt is very difficult to raise.
As far as the recession of the lake, I'd think it would be fairly easy to compare the 100-foot drop and the current rate of recession to estimates of the city's age. However, even if it's dropping only an inch per year right now, I'd bet that one good drought year could knock it down a couple of feet. (does that make me a catastrophist?
) Sadly, my googling led me only to crappy sensationalist sites like the one you quoted... they may be right but they don't quote any good data, only authorities and vague references to alternative dating methods. I've been interested in Tihuanaco for a long time for my own reasons and know a bit about it, but I'll be d@mned if I can find good facts online.