There have been civilizations that have nearly disappeared – the Mississippian civilization is an example. A native civilization of cities along the Mississippi river. It had earth and wood cities, not stone. So after hundreds of years the only thing left was giant mounds of earth.
The Mayan civilization was an advanced civilization in terms of culture and sophistication, but stone age. The civilization disappeared but the stone pyramids and other buildings remained buried under jungle. So we were able to find them.
There could easily be stone age civilizations to rival the Mayans and Aztecs that have disappeared under water or if they lacked pyramids or other large stone buildings.
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