As I have posted on extensively, the creation of terra preta soils permitted dense urbanized Stone Age populations. Present day clearing activity is now exposing their presence for the archeological record.
It is noteworthy that these cities show dates only as early as 200 AD. This is likely a result of limited sampling. The tool set necessary was already a couple of thousand years old. This is common though for such dating because most samples come from areas representing the maximization of the culture and likely miss the long early development.
The late dates support the idea that the whole society was extent when the new world was discovered. Once again Europeans did not so much as miss these antique civilizations so much as their pathogens got there first and threw these societies down. The nastiest pathogen was the slave trade of course.
With out question, these were states and they certainly fit the story of El Dorado Mesopotamia either. We have mounds and these were certain to hold wood frame structures of the leaders.
Terra preta made possible an Amazonian population in the tens of millions. The culture itself most likely prevented it from happening except for locales like this.
Amazon explorers uncover signs of a real El Dorado
Satellite technology detects giant mounds over 155 miles, pointing to sophisticated pre-Columbian culture
An aerial picture of traces of earthworks built by a lost Amazonian civilisation dating to 200AD. Photograph: National Geographic
It is the legend that drew legions of explorers and adventurers to their deaths: an ancient empire of citadels and treasure hidden deep in theAmazon jungle.
Spanish conquistadores ventured into the rainforest seeking fortune, followed over the centuries by others convinced they would find a lost civilisation to rival the Aztecs and Incas.
Some seekers called it El Dorado , others the City of Z.
Now, however, the doomed dreamers have been proved right: there was a great civilisation. New satellite imagery and fly-overs have revealed more than 200 huge geometric earthworks carved in the upper Amazon basin near Brazil's border with Bolivia
Spanning 155 miles, the circles, squares and other geometric shapes form a network of avenues, ditches and enclosures built long before Christopher Columbus set foot in the new world. Some date to as early as 200 AD, others to 1283.
Scientists who have mapped the earthworks believe there may be another 2,000 structures beneath the jungle canopy, vestiges of vanished societies.
The structures, many of which have been revealed by the clearance of forest for agriculture, point to a "sophisticated pre-Columbian monument-building society", says the journal Antiquity, which has published the research.
The article adds: "This hitherto unknown people constructed earthworks of precise geometric plan connected by straight orthogonal roads. The 'geoglyph culture' stretches over a region more than 250km across, and exploits both the floodplains and the uplands … we have so far seen no more than a tenth of it."
The structures were created by a network of trenches about 36ft (nearly 11 metres) wide and several feet deep, lined by banks up to 3ft high. Some were ringed by low mounds containing ceramics, charcoal and stone tools. It is thought they were used for fortifications, homes and ceremonies, and could have maintained a population of 60,000 – more people than in many medieval European cities.
The discoveries have demolished ideas that soils in the upper Amazon were too poor to support extensive agriculture, says Denise Schaan, a co-author of the study and anthropologist at the Federal University of Pará, in Belém , Brazil
Many of the mounds were symmetrical and slanted to the north, prompting theories that they had astronomical significance.
Researchers were especially surprised that earthworks in floodplains and uplands were of a similar style, suggesting they were all built by the same culture.
"In Amazonian archaeology you always have this idea that you find different peoples in different ecosystems," said Schaan. "So it was odd to have a culture that would take advantage of different ecosystems and expand over such a large region." The first geometric shapes were spotted in 1999 but it is only now, as satellite imagery and felling reveal sites, that the scale of the settlements is becoming clear. Some anthropologists say the feat, requiring sophisticated engineering, canals and roads, rivals Egypt
The findings follow separate discoveries further south, in the Xingu region, of interconnected villages known as "garden cities". Dating between 800 and 1600, they included houses, moats and palisades.
"These revelations are exploding our perceptions of what the Americas really looked liked before the arrival of Christopher Columbus," said David Grann, author of The Lost City of Z, a book about an attempt in the 1920s to find signs of Amazonian civilizations. "The discoveries are challenging long-held assumptions about the Amazon as a Hobbesian place where only small primitive tribes could ever have existed, and about the limits the environment placed on the rise of early civilisations."
They are also vindicating, said Grann, Percy Fawcett, the explorer who partly inspired Conan Doyle's book The Lost World. Fawcett led an expedition to find the City of Z
Many scientists saw the jungle as too harsh to sustain anything but small nomadic tribes. Now it seems the conquistadores who spoke of "cities that glistened in white" were telling the truth. They, however, probably also introduced the diseases that wiped out the native people, leaving the jungle to claim – and hide – all trace of their civilisation.
• This article was amended on Wednesday 6 January 2010. Percy Fawcett's experiences in the Amazon were said to have partly inspired Arthur Conan Doyle's book The Lost World, but Fawcett's disappearance did not, contrary to a suggestion in the original article - he vanished after the book was published. This has been corrected.
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