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Javier E

Cousins of Neanderthals Left DNA in Africa, Scientists Report - NYTimes.com - 0 views

  • t's seems the height of arrogance for any paleoanthropologist to assume that the bones they have in hand represent all knowledge. That what is certainly the vast majority of still-existing bones and materials still hidden in earth doesn't represent anything they they don't already know from the relative scraps they have found.
  • On the other hand, the geneticists don't have "evidence", they have hints or suggestions. Sure, they can see existing genes in a modern DNA sampling that have similarities to genes from an older sampling dug from the earth, but how those genes came to be in the modern specimen is completely assumptive guesswork. The geneticists are looking at two end points and are 1. assuming they are of the same linear history and then 2. are assuming all the points in between. Rather grand assumptions.
  • evolution isn't something you "believe" in it is something you understand.
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  • The real problem is in how information is obtained. Anthropologists study bones and are forced to draw conclusions based on ancient, fragmentary evidence, and geneticists can obtain complete DNA samples, but not of very ancient organisms. Both are forced to make assumptions based on different sources of evidence. With regard to the accepted tree of life (much as a bridge lacking most of the cables or roadway) it's very much a work in progress!
Javier E

Pollen Study Points to Culprit in Bronze Era Mystery - NYTimes.com - 0 views

  • To the north lay the mighty Hittite empire; to the south, Egypt was thriving under the reign of the great Pharaoh Ramses II. Cyprus was a copper emporium. Greece basked in the opulence of its elite Mycenaean culture, and Ugarit was a bustling port city on the Syrian coast. In the land of Canaan, city states like Hazor and Megiddo flourished under Egyptian hegemony. Vibrant trade along the coast of the eastern Mediterranean connected it all.
  • Experts have long pondered the cause of the crisis that led to the Late Bronze Age collapse of civilization, and now believe that by studying grains of fossilized pollen they have uncovered the cause.
  • Theories have included patterns of warfare, plagues and earthquakes.
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  • unusually high-resolution analysis of pollen grains taken from sediment beneath the Sea of Galilee and the western shore of the Dead Sea, backed up by a robust chronology of radiocarbon dating, have pinpointed the period of crisis to the years 1250 to 1100 B.C.
  • this pollen count was done at intervals of 40 years — the highest resolution yet in this region,
  • the uniqueness of the study also lay in the combination of precise science and archaeological and historical analysis, offering the fullest picture yet of the collapse of civilization in this area at the end of the Bronze Age. “Egypt is gone. Forever,” said Professor Finkelstein. “It never got back to that level of prosperity again.”
  • the team extracted about 60 feet of cores of gray muddy sediment from the center of the Sea of Galilee in northern Israel, passing through 145 feet of water and drilling 65 feet into the lake bed, covering the last 9,000 years. At Wadi Zeelim in the southern Judean Desert, on the western margins of the Dead Sea, the team manually extracted eight cores of sediment, each about 20 inches long.
  • Pollen grains are one of the most durable organic materials in nature, she said, best preserved in lakes and deserts and lasting thousands of years. Each plant produces its own distinct pollen form, like a fingerprint. Extracting and analyzing the pollen grains from each stratum allows researchers to identify the vegetation that grew in the area and to reconstruct climate changes.
  • The results showed a sharp decrease in the Late Bronze Age of Mediterranean trees like oaks, pines and carobs, and in the local cultivation of olive trees, which the experts interpret as the consequence of repeated periods of drought.
  • The droughts were likely exacerbated by cold spells, the study said, causing famine and the movement of marauders from north to south. After the devastation came a wet period of recovery and resettlement, according to the experts — a new order that gave rise to the kingdoms of biblical times.
Javier E

A Sunken Kingdom Re-emerges - NYTimes.com - 0 views

  • The site in Happisburgh was 900,000 years old, a time when mammoths and hippos still roamed in these parts. No human bones or prints that old had ever been found in Britain.
  • Standing on the ridge above Cardigan Bay in Borth, Dr. Bates described what the area would have looked like at the height of the last ice age some 20,000 years ago: more than half a mile of ice overhead and dry land stretching across today’s North Sea. The sea level was 400 feet lower than it is today.“You could have walked from Denmark to Yorkshire in those days,”
  • suggest that they walked upright and looked much like modern humans, though their brains were smaller. If they had language, it was primitive. Living at the tail end of an interglacial era, as winters were growing colder, they may have had functional body hair. So far, there is no evidence that they used clothes, shelter, fire or tools more complex than simple stone flakes.
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  • Before some basic tools were found here in 2010, it had been believed that humans had entered Britain much later, about 700,000 years ago, Dr. Ashton said. (Before 2005, when another set of tools was discovered in Suffolk, the presumed date was 500,000 years ago.)
  • “We can reconstruct the climate and climate change nearly one million years ago,” Dr. Ashton said. “The big lesson is, we have to adapt. Whether we like it or not, the climate will change — it always has — and today we are accelerating that change.”
  • The footprints, the oldest known outside Africa, probably belonged to a family group of Homo antecessor, a cousin of Homo erectus that possibly became extinct when Homo heidelbergensis from Africa settled in Britain about 500,000 years ago, he said. Using foot-length-to-stature ratios, scientists estimate that the male was perhaps 5 feet 9 inches tall
  • About 10,000 years ago, temperatures warmed sharply, by eight to 10 degrees Fahrenheit. By that time, the European ice sheets had melted, but the much thicker North American sheets took much longer. While the climate had warmed to today’s levels, allowing mixed oak woodland to grow and humans to recolonize Britain, the sea level remained some 130 feet lower for another 3,000 years.
  • When it did rise, it would have been traumatic for the population, wiping out whatever settlement there was,
  • “Even in the reduced life span of the day, the coastline would have advanced dramatically,”
  • The ultimate legend, of course, is Atlantis, which Plato placed somewhere in the North Atlantic.
  • “It was a traumatic geological event, and people turned it into a story to make sense of it,”
Javier E

In New Textbook, the Story of Singapore Begins 500 Years Earlier - NYTimes.com - 0 views

  • “Every generation has to rewrite its history,” he said. While it used to suit Singapore to see itself as a city-state with a British heritage, modern Singapore needs a different interpretation of history to reinforce a more global perspective, he suggested.
  • Professor Miksic goes a step further. “A short history puts a nation on shaky ground; a shallowly rooted place could be overturned quickly,” he said. “If you can show a long cohabitation between the Malays and the Chinese, it proves you have a pretty stable arrangement.”
  • Other factors also may help explain the timing of the rewrite. “Now is a good time,” Professor Heng said. “There’s a need to develop a collective social memory. It’s become a political issue.”
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  • Professor Heng surmised that one reason it had taken so long to change the narrative may have been the government’s fears of communal conflict in the 1960s and ’70s.
  • “If Singapore before 1800 was a sleepy backwater, the Chinese majority could say, ‘We built Singapore; before it was a blank slate,”’ he said.
  • Professor Miksic gives credit for the new history lesson to former students who have reached positions of authority in academia and in the Ministry of Education.
  • Why did it take 30 years to change the story? “It takes overwhelming evidence to shift the mind-set of a people from one image of its past to another,”
Javier E

DNA Deciphers Roots of Modern Europeans - NYTimes.com - 0 views

  • today’s Europeans descend from three groups who moved into Europe at different stages of history.
  • The first were hunter-gatherers who arrived some 45,000 years ago in Europe. Then came farmers who arrived from the Near East about 8,000 years ago.
  • Finally, a group of nomadic sheepherders from western Russia called the Yamnaya arrived about 4,500 years ago. The authors of the new studies also suggest that the Yamnaya language may have given rise to many of the languages spoken in Europe today.
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  • the new studies were “a major game-changer. To me, it marks a new phase in ancient DNA research.”
  • Until about 9,000 years ago, Europe was home to a genetically distinct population of hunter-gatherers, the researchers found. Then, between 9,000 and 7,000 years ago, the genetic profiles of the inhabitants in some parts of Europe abruptly changed, acquiring DNA from Near Eastern populations.
  • Archaeologists have long known that farming practices spread into Europe at the time from Turkey. But the new evidence shows that it wasn’t just the ideas that spread — the farmers did, too.
  • the Yamnaya, who left behind artifacts on the steppes of western Russia and Ukraine dating from 5,300 to 4,600 years ago. The Yamnaya used horses to manage huge herds of sheep, and followed their livestock across the steppes with wagons full of food and water.
  • “You have groups which are as genetically distinct as Europeans and East Asians. And they’re living side by side for thousands of years.”
  • Between 7,000 and 5,000 years ago, however, hunter-gatherer DNA began turning up in the genes of European farmers. “There’s a breakdown of these cultural barriers, and they mix,”
  • About 4,500 years ago, the final piece of Europe’s genetic puzzle fell into place. A new infusion of DNA arrived — one that is still very common in living Europeans, especially in central and northern Europe.
  • The hunter-gatherers didn’t disappear, however. They managed to survive in pockets across Europe between the farming communities.
  • The closest match to this new DNA, both teams of scientists found, comes from skeletons found in Yamnaya graves in western Russia and Ukraine.
  • it was likely that the expansion of Yamnaya into Europe was relatively peaceful. “It wasn’t Attila the Hun coming in and killing everybody,”
  • the most likely scenario was that the Yamnaya “entered into some kind of stable opposition” with the resident Europeans that lasted for a few centuries. But then gradually the barriers between the cultures eroded.
  • the Yamnaya didn’t just expand west into Europe, however. The scientists examined DNA from 4,700-year-old skeletons from a Siberian culture called the Afanasievo. It turns out that they inherited Yamnaya DNA, too.
  • was surprised by the possibility that Yamnaya pushed out over a range of about 4,000 miles. “
  • For decades, linguists have debated how Indo-European got to Europe. Some favor the idea that the original farmers brought Indo-European into Europe from Turkey. Others think the language came from the Russian steppes thousands of years later.
  • he did think the results were consistent with the idea that the Yamnaya brought Indo-European from the steppes to Europe.
  • The eastward expansion of Yamnaya, evident in the genetic findings, also supports the theory, Dr. Willerslev said. Linguists have long puzzled over an Indo-European language once spoken in western China called Tocharian. It is only known from 1,200-year-old manuscripts discovered in ancient desert towns. It is possible that Tocharian was a vestige of the eastern spread of the Yamnaya.
  • the new studies were important, but were still too limited to settle the debate over the origins of Indo-European. “I don’t think we’re there yet,” he said.
  • Dr. Heggarty speculated instead that early European farmers, the second wave of immigrants, may have brought Indo-European to Europe from the Near East. Then, thousands of years later, the Yamnaya brought the language again to Central Europe.
Javier E

Ecce Homo naledi | The Economist - 0 views

  • a shift in palaeoanthropological wisdom. Evolution’s little experiments yield a many-branched tree and not just a timeline; physical features arise and disappear or persist in a way that frustrates efforts to define ancestry just on the basis of what old bones look like. As a result, the idea that there is one clear lineage from the australopithecines to humans via some small number of progressively more human-like ancestors must now be thrown out. And the more excavations are carried out far from eastern Africa, where most of the fossils underpinning our current understanding of the human family tree were dug up, the more diverse and interesting the human story will become.
Javier E

Clovis People Weren't First in Americas, Texas Arrowheads Suggest - NYTimes.com - 0 views

  • Genetic studies of ancient bones and later American Indians indicate their ancestors came from northeast Asia, possibly across the Bering land bridge at a time of low sea levels during the last ice age. But it has puzzled scientists that nothing like the Clovis technology has ever been found in Siberia.
Javier E

Fossil Teeth Put Humans in Europe Earlier Than Thought - NYTimes.com - 0 views

  • the artifacts associated with the Kents Cavern fossil confirm “what researchers have long suspected, that the human newcomers spread the Aurignacian culture.”
  • the earlier dates for these fossils meant “that early humans must have coexisted with Neanderthals in this part of the world, something which a number of researchers have doubted.”
  • The confirmed early appearance of modern humans in Europe gave them more time for contacts with Neanderthals before the latter’s extinction about 30,000 years ago.
Javier E

Man's Genome From 45,000 Years Ago Is Reconstructed - NYTimes.com - 0 views

  • Scientists have reconstructed the genome of a man who lived 45,000 years ago, by far the oldest genetic record ever obtained from modern humans. The research, published on Wednesday in the journal Nature, provided new clues to the expansion of modern humans from Africa about 60,000 years ago, when they moved into Europe and Asia.
  • In December, they published the entirety of a Neanderthal genome extracted from a single toe bone. Comparing Neanderthal to human genomes, Dr. Paabo and his colleagues found that we share a common ancestor, which they estimated lived about 600,000 years ago.
  • They found that his DNA was more like that of non-Africans than that of Africans. But the Ust’-Ishim man was no more closely related to ancient Europeans than he was to East Asians.He was part of an earlier lineage, the scientists concluded — a group that eventually gave rise to all non-African humans.
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  • The Ust’-Ishim man’s genome suggests he belonged to a group of people who lived after the African exodus, but before the split between Europeans and Asians.
  • By comparing the Ust’-Ishim man’s long stretches of Neanderthal DNA with shorter stretches in living humans, Dr. Paabo and his colleagues estimated the rate at which they had fragmented. They used that information to determine how long ago Neanderthals and humans interbred.
  • Humans and Neanderthals interbred 50,000 to 60,000 years ago, according to the new data.
  • The findings raised questions about research suggesting that humans in India and the Near East dated back as far as 100,000 years ago. Some scientists believe that humans expanded out of Africa in a series of waves.
  • the new study offered compelling evidence that living non-Africans descended from a group of people who moved out of Africa about 60,000 years ago.Any humans that expanded out of Africa before then probably died out, Mr. Stringer said.
Javier E

Study Reveals Genetic Path of Modern Britons - NYTimes.com - 0 views

  • In A.D. 410, Roman authority in Britain collapsed and Romano-British society disappeared from history under the invading tides of Angles and Saxons from northern Europe. Historians have been debating ever since whether the Romano-British were wiped out or survived by adopting their conquerors’ language and culture
  • A fine-scale genetic analysis of the British population has now provided the answer. The invaders and the existing population lived side by side and eventually intermarried extensively. The people of south and central England are now genetically well mixed, with Saxon genes accounting for only about 20 percent of the mix
  • The British Isles were wiped clean of people by the glaciers that descended toward the end of the last ice age, and were repopulated some 10,000 years ago by people who trekked over the broad land bridge that then joined eastern England to Europe north of the Rhine. The researchers say they can identify the genetic signature of this early migration, which survives most strongly in people from the western extremity of Wales.
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  • But the geneticists see no trace of the Danelaw, the Danish rule over northern England from the ninth to the 11th century, nor of the Norman Conquest of England in 1066. The numbers of invaders may have been too small to leave a demographic imprint
  • in the case of the Normans, who had previously emigrated from southern Denmark to Normandy, it is hard to distinguish their genes from those of the earlier Danish invaders.
  • The people of the southern and central parts of England form a homogeneous population, but all around the Celtic periphery, in Cornwall, Wales and Scotland, lie small clusters of genetically different populations that have maintained their identity over the generations. This is a surprise, given that the Celtic peoples who ruled most of England until Caesar’s invasion in B.C. 55 were assumed to be fairly homogeneous.
  • The researchers found that the modern British population falls into 17 clusters altogether, based on genetic relatedness. Though very similar, the groups are genetically distinguishable, and even the main population cluster, that of southern and central England, is distinguishable from the populations of France, Germany and other European countries.
  • Dr. Donnelly and his colleagues managed to sidestep this recent churning of the population history by seeking out elderly people who lived in rural areas and whose grandparents had been born locally. Because individual genomes are composed of random samples of the four grandparents’ DNA, the researchers were in effect looking two generations into the past and testing the population of the late 19th century.
  • They analyzed the DNA of their 2,000 subjects at 500,000 sites along the genome, and then organized them into the 17 genetic clusters. They also analyzed the genomes of 6,000 Europeans in the same way, and could thus identify the source populations in Europe from which each of the 17 British clusters was derived.
  • The migrations revealed in that way match the known historical record but also point to events that have not been recorded, such as a major migration from northern France that accounts for about one-third of the ancestry of the average person in Britain.
  • “History is written by the winners, and archaeology studies the burials of wealthy people,” Dr. Donnelly said. “But genetic evidence is interesting because it complements that by showing what is happening to the masses rather than the elite.”
Javier E

NASA Adds to Evidence of Mysterious Ancient Earthworks - The New York Times - 0 views

  • High in the skies over Kazakhstan, space-age technology has revealed an ancient mystery on the ground.
  • Satellite pictures of a remote and treeless northern steppe reveal colossal earthworks — geometric figures of squares, crosses, lines and rings the size of several football fields, recognizable only from the air and the oldest estimated at 8,000 years old.
  • the Mahandzhar culture, which flourished there from 7,000 B.C. to 5,000 B.C., could be linked to the older figures.
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  • But scientists marvel that a nomadic population would have stayed in place for the time required to fell and lay timber for ramparts, and to dig out lake bed sediments to construct the huge mounds, originally 6 to 10 feet high and now 3 feet high and nearly 40 feet across.
  • these figures and similar ones in Peru and Chile were changing views about early nomads.
  • “The idea that foragers could amass the numbers of people necessary to undertake large-scale projects — like creating the Kazakhstan geoglyphs — has caused archaeologists to deeply rethink the nature and timing of sophisticated large-scale human organization as one that predates settled and civilized societies,”
  • she was dubious about calling the structures geoglyphs — a term applied to the enigmatic Nazca Lines in Peru that depict animals and plants — because geoglyphs “define art rather than objects with function.”
  • Dr. Matuzeviciute said she used optically stimulated luminescence, a method of measuring doses from ionizing radiation, to analyze the construction material, and came up with a date from one of the mounds of around 800 B.C. Other preliminary studies push the earliest date back more than 8,000 years, which could make them the oldest such creations ever found. Other materials yield dates in the Middle Ages.
  • ome of the figures might have been solar observatories akin, according to some theories, to Stonehenge in England and the Chankillo towers in Peru.
  • Dr. LaPorte said he, Mr. Dey and their colleagues were also looking into using drones, as the Culture Ministry in Peru has been doing to map and protect ancient sites.
Javier E

Ancient DNA is Rewriting Human (and Neanderthal) History - The Atlantic - 0 views

  • Sarah Zhang: You recently published two papers in which you analyzed over 600 genomes from ancient Europeans
  • Reich: In our hands, a successful sample costs less than $200. That’s only two or three times more than processing them on a present-day person
  • Reich: In Europe where we have the best data currently—although that will change over the coming years—we know a lot about how people have migrated. We know of multiple layers of population replacement over the last 50,000 years. Between 41,000 and 39,000 years ago in western Europe, the Neanderthals were replaced by modern human populations. The first modern human samples we have in Europe are about 40,000 years old and are genetically not at all related to present-day Europeans. They seem to be from extinct, dead-end groups.
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  • After that, you see for the first time people related to later European hunter-gatherers who have contributed a little bit to present-day Europeans. That happens beginning 35,000 to 37,000 years ago. Then the ice sheets descend across northern Europe and a lot of these populations are chased into these refuges in the southern peninsulas of Europe. After the Ice Age, there’s a repeopling of northern Europe from the southwest, probably from Spain, and then also from the southeast, probably from Greece and maybe even from Anatolia, Turkey
  • Again, after 9,000 years ago, there’s a mass movement of farmers into the region which almost completely replaces the hunter-gatherers with a small amount of mixture
  • And then again, after 5,000 years ago, there’s this mass movement at the beginning of the Bronze Age of people from the steppe, who also probably bring these languages that are spoken by the great majority of Europeans today.
  • Reich: Archaeology has always been political, especially in Europe. Archaeologists are very aware of the misuse of archaeology in the past, in the 20th century. There’s a very famous German archaeologist named Gustaf Kossinna, who was the first or one of the first to come up with the idea of “material culture.” Say, you see similar pots, and therefore you’re in a region where there was shared community and aspects of culture.
  • He went so far as to argue that when you see the spread of these pots, you’re actually seeing a spread of people and there’s a one-to-one mapping for those things. His ideas were used by the Nazis later, in propaganda, to argue that a particular group in Europe, the Aryans, expanded in all directions across Europe.
  • This was used to justify their expansionism in the propaganda that the Germans used in the run-up to the Second World War.
  • So after the Second World War, there was a very strong reaction in the European archaeological community—not just the Germans, but the broad continental European archaeological community—to the fact that their discipline had been used for these terrible political ends. And there was a retreat from the ideas of Kossinna.
  • one of the things the ancient DNA is showing is actually the Corded Ware culture does correspond coherently to a group of people. [Editor’s note: The Corded Ware made pottery with cord-like ornamentation and according to ancient DNA studies, they descended from steppe ancestry.] I think that was a very sensitive issue to some of our coauthors
  • Our results are actually almost diametrically opposite from what Kossina thought because these Corded Ware people come from the East, a place that Kossina would have despised as a source for them.
  • it is true that there’s big population movements, and so I think what the DNA is doing is it’s forcing the hand of this discussion in archaeology, showing that in fact, major movements of people do occur. They are sometimes sharp and dramatic, and they involve large-scale population replacements over a relatively short period of time. We now can see that for the first time.
  • Zhang: As you say, the genetics data is now often ahead of the archaeology, and you keep finding these big, dramatic population replacements throughout human history that can’t yet be fully explained. How should we be thinking about these population replacements? Is there a danger in people interpreting or misinterpreting them as the result of one group’s superiority over another?
  • When you see these replacements of Neanderthals by modern humans or Europeans and Africans substantially replacing Native Americans in the last 500 years or the people who built Stonehenge, who were obviously extraordinarily sophisticated, being replaced from these people from the continent, it doesn’t say something about the innate potential of these people. But it rather says something about the different immune systems or cultural mismatch.
  • Zhang: On the point of immune systems, one of the hypotheses for why people from the steppe were so successful in spreading through Europe is that they brought the bubonic plague with them. Since the plague is endemic to Central Asia, they may have built up immunity but the European farmers they encountered had not.
  • ut there have been profound and Earth-shattering events, again and again, every few thousand years in our history and that’s what ancient DNA is telling us.
  • if you actually take any serious look at this data, it just confounds every stereotype. It’s revealing that the differences among populations we see today are actually only a few thousand years old at most and that everybody is mixed.
  • I think that if you pay any attention to this world, and have any degree of seriousness, then you can’t come out feeling affirmed in the racist view of the world. You have to be more open to immigration. You have to be more open to the mixing of different peoples. That’s your own history.
Javier E

Laser scanning reveals 'lost' ancient Mexican city had as many buildings as Manhattan |... - 0 views

  • researchers have used the technique to reveal the full extent of an ancient city in western Mexico, about a half an hour’s drive from Morelia, built by rivals to the Aztecs.
  • light detection and ranging scanning (lidar) involves directing a rapid succession of laser pulses at the ground from an aircraft.
  • The time and wavelength of the pulses reflected by the surface are combined with GPS and other data to produce a precise, three-dimensional map of the landscape. Crucially, the technique probes beneath foliage – useful for areas where vegetation is dense.
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  • the Purépecha were a major civilisation in central Mexico in the early 16th century, before Europeans arrived and wreaked havoc through war and disease. Purépecha cities included an imperial capital called Tzintzuntzan that lies on the edge of Lake Pátzcuaro in western Mexico, an area in which modern Purépecha communities still live.
  • Using lidar, researchers have found that the recently-discovered city, known as Angamuco, was more than double the size of Tzintzuntzan – although probably not as densely populated – extending over 26 km2 of ground that was covered by a lava flow thousands of years ago.
  • “If you do the maths, all of a sudden you are talking about 40,000 building foundations up there, which is [about] the same number of building foundations that are on the island of Manhattan.”
  • The team also found that Angamuco has an unusual layout. Monuments such as pyramids and open plazas are largely concentrated in eight zones around the city’s edges, rather being located in one large city centre
  • more than 100,000 people are thought to have lived in Angamuco in its heyday between about 1000AD to 1350AD. “[Its size] would make it the biggest city that we know of right now in western Mexico during this period,”
  • The earliest evidence from the city, including ceramic fragments and radiocarbon dating of remnants from offerings, dates to about 900AD, with the city believed to have undergone two waves of development and one of collapse before the arrival of the Spanish.
  • Fisher adds that lidar is likely to lead to further developments. “Everywhere you point the lidar instrument you find new stuff, and that is because we know so little about the archaeological universe in the Americas right now,” he said. “Right now every textbook has to be rewritten, and two years from now[they’re] going to have to be rewritten again.”
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