Lost Mayan city found in Mexico jungle by accident
The city is the size of Edinburgh and among the largest Mayan sites in ancient Latin America.
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The team discovered three sites in total, in a survey area the size of Scotland's capital Edinburgh, “by accident” when one archaeologist browsed data on the internet.
“I was on something like page 16 of Google search and found a laser survey done by a Mexican organisation for environmental monitoring,” explains Luke Auld-Thomas, a PhD student at Tulane university in the US.
It was a Lidar survey, a remote sensing technique which fires thousands of laser pulses from a plane and maps objects below using the time the signal takes to return.
But when Mr Auld-Thomas processed the data with methods used by archaeologists, he saw what others had missed - a huge ancient city which may have been home to 30-50,000 people at its peak from 750 to 850 AD.
That is more than the number of people who live in the region today, the researchers say.
We can’t be sure what led to the demise and eventual abandonment of the city, but the archaeologists say climate change was a major factor.
The research suggests that when Maya civilisations collapsed from 800AD onwards, it was partly because they were so densely populated and could not survive climate problems.
"It's suggesting that the landscape was just completely full of people at the onset of drought conditions and it didn't have a lot of flexibility left. And so maybe the entire system basically unravelled as people moved farther away," says Mr Auld-Thomas.
Warfare and the conquest of the region by Spanish invaders in the 16th century also contributed to eradication of Maya city states.
I thought it was interesting that they found a lost city by accident.
I find it fascinating how so many cities can tend to survive for thousands of years, even though the government may change, the boundaries of a country might change, and the countries which rule a given city may change. Yet, some cities can still manage to live on and thrive nonetheless. They are rebuilt after being destroyed in war.
But then, there are other cities which not only become abandoned, but are completely forgotten and (as in this case) have to be discovered by accident.