by forest hint at a previously unknown ancient society that flourished
in the Amazon, a new study says.
Satellite images of the upper Amazon Basin taken since 1999 have
revealed more than 200 geometric earthworks spanning a distance
greater than 155 miles (250 kilometers).
(Related: "Huge Pre-Stonehenge Complex Found via 'Crop Circles.'")
Now researchers estimate that nearly ten times as many such
structures—of unknown purpose—may exist undetected under the Amazon's
forest cover.
At least one of the sites has been dated to around A.D. 1283, although
others may date as far back as A.D. 200 to 300, said study co-author
Denise Schaan, an anthropologist at the Federal University of Pará in
Belém, Brazil.
The discovery adds to evidence that the hinterlands of the Amazon
once teemed with complex societies, which were largely wiped out by
diseases brought to South America by European colonists in the 15th
and 16th centuries, Schaan said.
Since these vanished societies had gone unrecorded, previous research
had suggested that soilsin the upper Amazon were too poor to support
the extensive agriculture needed for such large, permanent
settlements.
"We found that this picture is wrong," Schaan said. "And there is a
lot more to discover in these places."
Wide-reaching Culture
The newfound shapes are created by a series of trenches about 36 feet
(11 meters) wide and several feet deep, with adjacent banks up to 3
feet (1 meter) tall. Straight roads connect many of the earthworks.
Preliminary excavations at one of the sites in 2008 revealed that some
of the earthworks were surrounded by low mounds containing domestic
ceramics, charcoal, grinding-stone fragments, and other evidence of
habitation.
But who built the structures and what functions they served remains a
mystery. Ideas range from defensive buildings to ceremonial centers
and homes, the study authors say.
It's also possible the structures served different purposes over time,
noted William Woods, a geographer and anthropologist at the University
of Kansas in Lawrence who was not involved in the research.
"For example," he said, "in Lawrence there's a Masonic temple—it is
now a bar. There was a bank—it is now a restaurant called Tellers.
These things happen."
What most surprised the research team is that the earthworks appear in
both the region's floodplains and the uplands.
In general, the Amazon's fertile floodplains have been popular sites
for ancient civilizations, while the sparser uplands have been thought
to be largely devoid of people, the researchers say.
What's more, the earthworks in both regions are of a similar style,
suggesting they were built by the same society.
"In Amazonian archaeology you always have this idea that you find
different peoples in different ecosystems," study co-author Schaan
said.
"And so it was kind of odd to have a culture that would take advantage
of different ecosystems and expand over such a large region."
"Astounding" Population
The uplands sites appear to have been home to as many as 60,000
people, Schaan and her colleagues suggest in their paper, published
this month in the journalAntiquity.
That figure is based on estimates of the social organization and labor
that would have been required to build the structures hinted at by the
remaining earthworks.
According to the University of Kansas' Woods, the population estimate
is reasonable, albeit rough, since so little is known about these
complexes.
Answers may emerge as researchers continue to excavate the newfound
shapes in the coming years.
But Woods is impressed by the possibility that so many people might
have once lived in a region long thought uninhabited.
"Traditionally, if you would have asked an anthropologist or
archaeologist how many people lived [in these Amazon uplands], they'd
say almost zero," he said.
"And so this is astounding that there is 60,000 people making a go of
it where there aren't supposed to be any."
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