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Human settlements already existed in the Amazon Basin 4000 years ago
http://www.eurekalert.org/pub_releases/2003-07/idrp-hsa070703.phpAn important discovery by IRD archaeologists reveals that, more than 4000 years ago, early Andean civilizations had become established in a tropical environment where they were not hitherto known to have existed.
Submitted in section: Archaeology: Regional: South America: Ecuador: Human settlements already existed in the Amazon Basin 4000 years ago