[blam]

"Humans probably had civilizations for many years, easily more than 10,000 years, only to wiped out by catacylsmic events, so evidence of them are scant."

Yup. The end of the Ice Age flooded them out. They were probably in Sundaland, a real good/warm place to spend the Ice Age. It went underwater...some say it was Atlantis.

[Ptarmigan]

I tend to agree that Atlantis was in present day Indonesia. The way Plato described, it occurred 9,000 years before he existed and the description of Atlantis. Indonesia fits the bill for sure. Some people think there was a another Atlantis is what is now the Yucatan Peninsula in Mexico.