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$\begingroup$ I'm not sure about that given the state of the south American ruins above - many of these have been abandoned for more than that yet are still above ground. $\endgroup$– Miller86Commented May 20, 2016 at 14:16
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1$\begingroup$ Many weren't though. And South American rainforest is not deciduous forest anyway. They weren't dealing with a yearly 3-foot thick fall of leaves compacting to a 1-inch layer of compost, and they had substantially more rainfall clearing away what leaves did fall. If you've only got relatively low buildings then even modest accumulation of compost/soil will bury them. Skara Brae would be a classic example of this, although that had more than 1500 years to be hidden, but then that was in a location without any trees to add to the compost layer and with substantial wind erosion of soil. $\endgroup$– GrahamCommented May 20, 2016 at 15:58
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