From Phys.org:
ShareNew research conducted using airborne laser scanning reveals that a multicultural civilization that flourished in southwestern Amazonia between 600 BCE and 850 CE was home to millions of people. Spanning roughly 183,000 square kilometers (71,000 square miles), the Aquiry civilization built large centers for political and ritual purposes. By surveying a representative section of the area, researchers identified the remains of more than 400 well-preserved sites of monumental ceremonial architecture, along with some later settlement sites.
Extrapolating their findings to the civilization's full territory, the researchers arrived at a cautious estimate of more than 20,000 ancient earthwork ceremonial centers. The largest known site covers 50 hectares (124 acres).
Comprehensive surveys and radiocarbon dating showed that the Aquiry territory—which makes up less than 3% of Greater Amazonia—was already home to 1.25–3 million people at the start of the first millennium. This finding challenges earlier, more conservative estimates of the population across the wider Amazon region, which have ranged between 1 million and 10 million. The Amazon's total population may have numbered in the tens of millions.
"Our findings overturn our understanding of the Amazon region's past," says the emeritus professor at the University of Helsinki who led the study published in Nature. (Read more.)


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