"30,000 years ago, as few as 1,000 humans in Asia, Europe"

In USA Today:

Though it may seem difficult to believe in a world with almost seven billion people, humans were once thin on the ground, and at times teetered on the brink of extinction.

For most of the history of our species, there weren't many of us, probably in the "tens of thousands, comparable to modern populations of gorillas and chimpanzees," says Richard Durbin, a genome scientist with the Wellcome Trust Sanger Institute in Cambridge, England.

Durbin and Heng Li, a colleague at the Broad Institute of Harvard and Massachusetts Institute of Technology have a paper in this week's edition of the journal Nature in which they present a new method they have developed to look at a single person's DNA sequences and using them as a representative of all their ancestors -- and thus map out the history of the species.

They applied it to seven people: a Chinese man, a Korean man, three Europeans and two Yoruba men from west Africa. What they found was interesting.

Anatomically modern humans originated in southern Africa. It's generally believed that some of them began to move northwards out of Africa between 50,000 to 60,000 years ago.

However the researchers' evidence shows that there was at least some differentiation between African and non-African human populations as early as 100,000 and 120,000 years ago.

In addition, once the European and Asian groups had left the continent, it wasn't as if they never intermingled again. Genetic exchange between the groups continued until around 20,000 years ago, their research found. That doesn't necessary mean one person every year, "but maybe every few hundred another bunch left," says Durbin.

Those populations who left lived through very hard times. The people who became modern Europeans and Asians underwent a severe population bottleneck sometime between 100,000 and 30,000 years ago, getting down to as few as 1,000 people who were reproducing, it appears.

"It also looks like the Africans also decreased at the same time, though not as much," Durbin says.

What's known about that era is that it was one of extreme changes in climate, with ice ages coming and then receding. This was especially a problem in more northern latitudes and perhaps less so in Africa. The latest ice age only finished about 10,000 years ago, after which agriculture began to flourish.

Today's human population represents an enormous shift from those early, few and threatened primates. "The fact that we're pervasive in the world now is sort of an anomaly in the history of great ape populations," says Durbin.

"It's official: An asteroid wiped out the dinosaurs"

LONDON (Reuters) – A giant asteroid smashing into Earth is the only plausible explanation for the extinction of the dinosaurs, a global scientific team said on Thursday, hoping to settle a row that has divided experts for decades.

A panel of 41 scientists from across the world reviewed 20 years' worth of research to try to confirm the cause of the so-called Cretaceous-Tertiary (KT) extinction, which created a "hellish environment" around 65 million years ago and wiped out more than half of all species on the planet.

Scientific opinion was split over whether the extinction was caused by an asteroid or by volcanic activity in the Deccan Traps in what is now India, where there were a series of super volcanic eruptions that lasted around 1.5 million years.

The new study, conducted by scientists from Europe, the United States, Mexico, Canada and Japan and published in the journal Science, found that a 15-kilometre (9 miles) wide asteroid slamming into Earth at Chicxulub in what is now Mexico was the culprit.

"We now have great confidence that an asteroid was the cause of the KT extinction. This triggered large-scale fires, earthquakes measuring more than 10 on the Richter scale, and continental landslides, which created tsunamis," said Joanna Morgan of Imperial College London, a co-author of the review.

The asteroid is thought to have hit Earth with a force a billion times more powerful than the atomic bomb at Hiroshima.
Morgan said the "final nail in the coffin for the dinosaurs" came when blasted material flew into the atmosphere, shrouding the planet in darkness, causing a global winter and "killing off many species that couldn't adapt to this hellish environment."

Scientists working on the study analyzed the work of paleontologists, geochemists, climate modelers, geophysicists and sedimentologists who have been collecting evidence about the KT extinction over the last 20 years.

Geological records show the event that triggered the dinosaurs' demise rapidly destroyed marine and land ecosystems, they said, and the asteroid hit "is the only plausible explanation for this."

Peter Schulte of the University of Erlangen in Germany, a lead author on the study, said fossil records clearly show a mass extinction about 65.5 million years ago -- a time now known as the K-Pg boundary...

"The KT extinction was a pivotal moment in Earth's history, which ultimately paved the way for humans to become the dominant species on Earth," Gareth Collins wrote in a commentary on the study.

(Collins has created a website at http://impact.ese.ic.ac.uk/ImpactEffects/Chicxulub.html which allows readers to see the effects of the asteroid impact.)

"'Titanic' boa fossils provide clues to past tropical climate."

A vertebra of a modern Anaconda (left) and (right) a vertebra from the Titanoboa.

This snake could have been 2500+ lbs. and as long as a city bus.

From Nature:

Researchers have found fossils of the biggest known snake in the world, a discovery that could shed light on the climate of the tropics in the past.

The scientists estimate the snake lived 58 to 60 million years ago and was around 13 metres long. The giant, found in northeastern Colombia, dwarfs modern pythons and anacondas which usually don't exceed 6-6.5 metres and are thought to be the largest living snakes.

Since snakes are poikilotherms that, unlike humans, need heat from their environment to power their metabolism, the researchers suggest that at the time the region would have had to be 30 to 34 degrees Celsius for the snake to have survived. Most large snakes alive today live in the South American and southeast Asian tropics, where the high temperatures allow them to grow to impressive sizes.

"We've taken the snake and turned it into a giant thermometer," says lead author and vertebrate palaeontologist Jason Head of the University of Toronto in Canada, who says he "just about screamed" when he first saw the size of the fossils....

Using models1 based on the largest modern-day snakes and their estimate of the Titanoboa's size, the team calculated how hot the tropics must have been 58 to 60 million years ago, a period known as the Palaeocene. The mean annual temperature would need to be at least 30-34 degrees Celsius to support the snake's metabolism, the researchers report in Nature2. This range matches previous estimates from Palaeocene climate models that assume high atmospheric carbon dioxide concentrations3.

The results support the idea that the temperature difference between the Palaeocene tropics and higher-latitude regions was as large as it is today, even though the higher latitudes were much warmer during that time. This counters the so-called 'thermostat' hypothesis, which predicts that tropical temperatures would stay fairly stable even as other parts of the world heated up.

The Goat and the Tree and Murkum

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Click on image to see Animation of Goat - determined to be the oldest known animation sequence - painted on an ancient Iranian earthenware bowl discovered in a grave at the 5200-year-old Burnt City.

The image is of a goat jumping up to eat the leaves of a tree.

From The Circle of Ancient Iranian Studies:

The image is a simple depiction of a tree and wild-goat (Capra aegagrus) also known as 'Persian desert Ibex', and since it is an indigenous animal to the region, it would naturally appear in the iconography of the Burnt City.

The wild goat motif can be seen on Iranian pottery dating back to the 4th millennium BCE, as well as jewellery pieces especially among Cassite tribes of ancient Luristan. However, the oldest wild goat representation in Iran was discovered in Negaran Valley in Sardast region, 37 kilometers from Nahok village near Saravan back in 1999. The engraved painting of wild goat is part of an important collection of lithoglyphs dating back to 8000 BCE.

However, wild goat representation with a tree is associated with Murkum, a mother goddess who was worshipped by all the Indo-Iranian women of the Haramosh valley in modern Pakistan, which culturally had closer ties with Indus and subsequently the Burnt City civilisations, than Mesopotamia, which could had influenced the ancient potter who made this unique piece.

The Cultural Heritage, Tourism and Handicrafts Organization authorities (Iran) are insisting that it a depiction of the 'Assyrian Tree of Life’ even though it was created 1000 years before the Assyrian civilization. That is one way that goddess related imagery goes unrecognized or is lost.

(also posted at ...M's Impressions...)

"Mummified Dinosaur Unveiled"

Dakota, a 67-million-year-old "dino mummy" unveiled today by a British paleontologist, is seen here in an artist's rendering.

The extraordinarily preserved hadrosaur, or duck-billed dino, still had much of its tissues and bones intact, encased in an envelope of skin.

Research into the dinosaur's remains may further scientists' understanding of how the ancient creatures' skin appeared and how quickly they moved, said team leader Phillip Manning of the University of Manchester, a National Geographic Expeditions Council grantee.

"This specimen exceeds the jackpot," Manning said.

Dakota was about 35 feet (12 meters) long and weighed some 35 tons, but the dinosaur was no slowpoke, according to preliminary studies...

The 67-million-year old "dino mummy," nicknamed Dakota, was discovered in 1999 by then-teenage paleontologist Tyler Lyson on his family's North Dakota property...

Much of Dakota's fossilized skin has maintained its texture, allowing scientists to map it in 3-D and get a better picture of how duck-billed dinosaurs may have appeared..."And there seems to be striping patterns associated with joint areas on the arm," he added...

"Our models confirm this hadrosaur would have had potential to run faster than T. rex," Manning said. Preliminary calculations suggest that the dino could run 28 miles (45 kilometers) an hour, while T. rex topped out at about 20 miles (32 kilometers) an hour.

"Noah's Ark" flood spurred European farming

An ancient flood some say could be the origin of the story of Noah's Ark may have helped the spread of agriculture in Europe 8,300 years ago by scattering the continent's earliest farmers, researchers said on Sunday.

Using radiocarbon dating and archaeological evidence, a British team showed the collapse of the North American ice sheet, which raised global sea levels by as much as 1.4 meters, displaced tens of thousands of people in southeastern Europe who carried farming skills to their new homes.

The researchers said in the journal Quaternary Science Reviews their study provides direct evidence linking the flood that breached a ridge keeping the Mediterranean apart from the Black Sea to the rise of farming in Europe.

"The flooding of the Black Sea was not well dated but we got it down to about 50 years," said Chris Turney, a geologist at the University of Exeter, who led the study. "As soon as the flooding is done, farming goes crazy across Europe."

The researchers created reconstructions of the Mediterranean and Black Sea shoreline before and after the rise in sea levels. They estimated the flood covered some 73,000 square kilometers over a 34-year period, causing mass displacement of people.

Previous archaeological evidence has shown communities in the region were already farming when the flood hit. The Exeter team suggests the mass migration caused a sudden expansion of farming and pottery production across the continent.

"We looked at all the earliest data on farming in Europe and we found a little bit of farming in Greece and the Balkans just before the flood," Turney said in a telephone interview. "When the flood happened, farming seemed to stop but it was re-established a generation later across Europe."

The researchers believe these people took their skills to new areas previously populated by hunters and gatherers where there had been no evidence of farming, Turney said...

"When the Black Sea flooded at end of last ice age some people have suggested it was the origins of the Noah's Ark myth," he said. "If you lived in that basin it would have seemed like the whole world had flooded."

"Japanese Roots"

by Jared Diamond / From Discover

Unearthing the origins of the Japanese is a much harder task than you might guess. Among world powers today, the Japanese are the most distinctive in their culture and environment. The origins of their language are one of the most disputed questions of linguistics. These questions are central to the self-image of the Japanese and to how they are viewed by other peoples. Japan’s rising dominance and touchy relations with its neighbors make it more important than ever to strip away myths and find answers.

The search for answers is difficult because the evidence is so conflicting. On the one hand, the Japanese people are biologically undistinctive, being very similar in appearance and genes to other East Asians, especially to Koreans. As the Japanese like to stress, they are culturally and biologically rather homogeneous, with the exception of a distinctive people called the Ainu on Japan’s northernmost island of Hokkaido. Taken together, these facts seem to suggest that the Japanese reached Japan only recently from the Asian mainland, too recently to have evolved differences from their mainland cousins, and displaced the Ainu, who represent the original inhabitants. But if that were true, you might expect the Japanese language to show close affinities to some mainland language, just as English is obviously closely related to other Germanic languages (because Anglo-Saxons from the continent conquered England as recently as the sixth century a.d.). How can we resolve this contradiction between Japan’s presumably ancient language and the evidence for recent origins?

Archeologists have proposed four conflicting theories. Most popular in Japan is the view that the Japanese gradually evolved from ancient Ice Age people who occupied Japan long before 20,000 b.c. Also widespread in Japan is a theory that the Japanese descended from horse-riding Asian nomads who passed through Korea to conquer Japan in the fourth century, but who were themselves—emphatically—not Koreans. A theory favored by many Western archeologists and Koreans, and unpopular in some circles in Japan, is that the Japanese are descendants of immigrants from Korea who arrived with rice-paddy agriculture around 400 b.c. Finally, the fourth theory holds that the peoples named in the other three theories could have mixed to form the modern Japanese.

When similar questions of origins arise about other peoples, they can be discussed dispassionately. That is not so for the Japanese. Until 1946, Japanese schools taught a myth of history based on the earliest recorded Japanese chronicles, which were written in the eighth century. They describe how the sun goddess Amaterasu, born from the left eye of the creator god Izanagi, sent her grandson Ninigi to Earth on the Japanese island of Kyushu to wed an earthly deity. Ninigi’s great-grandson Jimmu, aided by a dazzling sacred bird that rendered his enemies helpless, became the first emperor of Japan in 660 b.c. To fill the gap between 660 b.c. and the earliest historically documented Japanese monarchs, the chronicles invented 13 other equally fictitious emperors. Before the end of World War II, when Emperor Hirohito finally announced that he was not of divine descent, Japanese archeologists and historians had to make their interpretations conform to this chronicle account...

Why do they care so much? Unlike most other non-European countries, Japan preserved its independence and culture while emerging from isolation to create an industrialized society in the late nineteenth century. It was a remarkable achievement. Now the Japanese people are understandably concerned about maintaining their traditions in the face of massive Western cultural influences. They want to believe that their distinctive language and culture required uniquely complex developmental processes. To acknowledge a relationship of the Japanese language to any other language seems to constitute a surrender of cultural identity.

What makes it especially difficult to discuss Japanese archeology dispassionately is that Japanese interpretations of the past affect present behavior. Who among East Asian peoples brought culture to whom? Who has historical claims to whose land? These are not just academic questions. For instance, there is much archeological evidence that people and material objects passed between Japan and Korea in the period a.d. 300 to 700. Japanese interpret this to mean that Japan conquered Korea and brought Korean slaves and artisans to Japan; Koreans believe instead that Korea conquered Japan and that the founders of the Japanese imperial family were Korean...

Since languages change over time, the more similar two languages are, the more recently they must have diverged. By counting common words and features, linguists can estimate how long ago languages diverged, and such estimates suggest that Japanese and Korean parted company at least 4,000 years ago. As for the Ainu language, its origins are thoroughly in doubt; it may not have any special relationship to Japanese....

The seas that surround much of Japan and coastal East Asia are shallow enough to have been dry land during the ice ages, when much of the ocean water was locked up in glaciers and sea level lay at about 500 feet below its present measurement. Land bridges connected Japan’s main islands to one another, to the Russian mainland, and to South Korea. The mammals walking out to Japan included not only the ancestors of modern Japan’s bears and monkeys but also ancient humans, long before boats had been invented. Stone tools indicate human arrival as early as half a million years ago.

Around 13,000 years ago, as glaciers melted rapidly all over the world, conditions in Japan changed spectacularly for the better, as far as humans were concerned. Temperature, rainfall, and humidity all increased, raising plant productivity to present high levels. Deciduous leafy forests full of nut trees, which had been confined to southern Japan during the ice ages, expanded northward at the expense of coniferous forest, thereby replacing a forest type that had been rather sterile for humans with a much more productive one. The rise in sea level severed the land bridges, converted Japan from a piece of the Asian continent to a big archipelago, turned what had been a plain into rich shallow seas, and created thousands of miles of productive new coastline with innumerable islands, bays, tidal flats, and estuaries, all teeming with seafood...

Despite its distinctiveness even in East Asia at that time, Jomon Japan was not completely isolated. Pottery, obsidian, and fishhooks testify to some Jomon trade with Korea, Russia, and Okinawa—as does the arrival of Asian mainland crops. Compared with later eras, though, that limited trade with the outside world had little influence on Jomon society. Jomon Japan was a miniature conservative universe that changed surprisingly little over 10,000 years...

More than 10,000 years after the invention of pottery and the subsequent Jomon population explosion, a second decisive event in Japanese history triggered a second population explosion. Around 400 b.c., a new lifestyle arrived from South Korea. This second transition poses in acute form our question about who the Japanese are. Does the transition mark the replacement of Jomon people with immigrants from Korea, ancestral to the modern Japanese? Or did Japan’s original Jomon inhabitants continue to occupy Japan while learning valuable new tricks?

The new mode of living appeared first on the north coast of Japan’s southwesternmost island, Kyushu, just across the Korea Strait from South Korea. There we find Japan’s first metal tools, of iron, and Japan’s first undisputed full-scale agriculture. That agriculture came in the form of irrigated rice fields, complete with canals, dams, banks, paddies, and rice residues revealed by archeological excavations. Archeologists term the new way of living Yayoi, after a district of Tokyo where in 1884 its characteristic pottery was first recognized. Unlike Jomon pottery, Yayoi pottery was very similar to contemporary South Korean pottery in shape. Many other elements of the new Yayoi culture were unmistakably Korean and previously foreign to Japan, including bronze objects, weaving, glass beads, and styles of tools and houses...

It took several centuries for Yayoi Japan to show the first signs of social stratification, as reflected especially in cemeteries. After about 100 b.c., separate parts of cemeteries were set aside for the graves of what was evidently an emerging elite class, marked by luxury goods imported from China, such as beautiful jade objects and bronze mirrors. As the Yayoi population explosion continued, and as all the best swamps or irrigable plains suitable for wet rice agriculture began to fill up, the archeological evidence suggests that war became more and more frequent: that evidence includes mass production of arrowheads, defensive moats surrounding villages, and buried skeletons pierced by projectile points. These hallmarks of war in Yayoi Japan corroborate the earliest accounts of Japan in Chinese chronicles, which describe the land of Wa and its hundred little political units fighting one another...

Measurements have now been made of many skeletons. In addition, within the last three years molecular geneticists have begun to extract dna from ancient human skeletons and compare the genes of Japan’s ancient and modern populations. Jomon and Yayoi skeletons, researchers find, are on the average readily distinguishable. Jomon people tended to be shorter, with relatively longer forearms and lower legs, more wide-set eyes, shorter and wider faces, and much more pronounced facial topography, with strikingly raised browridges, noses, and nose bridges. Yayoi people averaged an inch or two taller, with close-set eyes, high and narrow faces, and flat browridges and noses. Some skeletons of the Yayoi period were still Jomon-like in appearance, but that is to be expected by almost any theory of the Jomon-Yayoi transition. By the time of the kofun period, all Japanese skeletons except those of the Ainu form a homogeneous group, resembling modern Japanese and Koreans.

In all these respects, Jomon skulls differ from those of modern Japanese and are most similar to those of modern Ainu, while Yayoi skulls most resemble those of modern Japanese. Similarly, geneticists attempting to calculate the relative contributions of Korean-like Yayoi genes and Ainu-like Jomon genes to the modern Japanese gene pool have concluded that the Yayoi contribution was generally dominant. Thus, immigrants from Korea really did make a big contribution to the modern Japanese, though we cannot yet say whether that was because of massive immigration or else modest immigration amplified by a high rate of population increase. Genetic studies of the past three years have also at last resolved the controversy about the origins of the Ainu: they are the descendants of Japan’s ancient Jomon inhabitants, mixed with Korean genes of Yayoi colonists and of the modern Japanese...


That is, the modern Ainu language of Hokkaido is not a model for the ancient Jomon language of Kyushu. By the same token, modern Korean may be a poor model for the ancient Yayoi language of Korean immigrants in 400 b.c. In the centuries before Korea became unified politically in a.d. 676, it consisted of three kingdoms. Modern Korean is derived from the language of the kingdom of Silla, the kingdom that emerged triumphant and unified Korea, but Silla was not the kingdom that had close contact with Japan in the preceding centuries. Early Korean chronicles tell us that the different kingdoms had different languages. While the languages of the kingdoms defeated by Silla are poorly known, the few preserved words of one of those kingdoms, Koguryo, are much more similar to the corresponding Old Japanese words than are the corresponding modern Korean words. Korean languages may have been even more diverse in 400 b.c., before political unification had reached the stage of three kingdoms. The Korean language that reached Japan in 400 b.c., and that evolved into modern Japanese, I suspect, was quite different from the Silla language that evolved into modern Korean. Hence we should not be surprised that modern Japanese and Korean people resemble each other far more in their appearance and genes than in their languages.

History gives the Japanese and the Koreans ample grounds for mutual distrust and contempt, so any conclusion confirming their close relationship is likely to be unpopular among both peoples. Like Arabs and Jews, Koreans and Japanese are joined by blood yet locked in traditional enmity. But enmity is mutually destructive, in East Asia as in the Middle East. As reluctant as Japanese and Koreans are to admit it, they are like twin brothers who shared their formative years. The political future of East Asia depends in large part on their success in rediscovering those ancient bonds between them.

"Stonehenge builders' houses found"

Archaeologists say they have found a huge ancient settlement used by the people who built Stonehenge.
Excavations at Durrington Walls, near the legendary Salisbury Plain monument, uncovered remains of ancient houses.

People seem to have occupied the sites seasonally, using them for ritual feasting and funeral ceremonies.

In ancient times, this settlement would have housed hundreds of people, making it the largest Neolithic village ever found in Britain.

The dwellings date back to 2,600-2,500 BC, the same period that Stonehenge was built.
"In what were houses, we have excavated the outlines on the floors of box beds and wooden dressers or cupboards," said archaeologist Mike Parker Pearson of Sheffield University.

He said he based this on the fact that these abodes had exactly the same layout as Neolithic houses at Skara Brae in Orkney, which have survived intact because - unlike these dwellings - they were made of stone.

The researchers have excavated eight houses in total that belonged to the Durrington settlement. But they have identified many other probable dwellings using geophysical surveying equipment.

The archaeologists think there could have been at least one hundred houses.

Each one would have measured about 5m (16ft) square: "fairly pokey", according to Professor Parker Pearson.



The dwellings were made of wood, with a clay floor and central hearth. The archaeologists found 4,600-year-old rubbish covering the floors of the houses.

"We've never seen such quantities of pottery and animal bone and flint."
The Sheffield University researcher thinks the settlement was probably not lived in all year round. Instead, he believes, Stonehenge and Durrington formed a religious complex used for funerary rituals.

Professor Parker Pearson believes it drew Neolithic people from all over the region, who came for massive feasts in the midwinter, where prodigious quantities of food were consumed. The bones were then tossed on the floors of the houses.

"The rubbish isn't your average domestic debris. There's a lack of craft-working equipment for cleaning animal hides and no evidence for crop-processing," he said.

"The animal bones are being thrown away half-eaten. It's what we call a feasting assemblage. This is where they went to party - you could say it was the first free festival."

The Durrington settlement has its own henge, this one made of wood. This ancient circle was discovered in 1967 - long before any houses were excavated.

Both henges line up with events in the astronomical calendar - but not the same ones.

Stonehenge is aligned with the midwinter solstice sunset, while the Durrington timber circle is aligned with the midwinter solstice sunrise. They were complementary, said Mike Parker Pearson.

This fits nicely with the idea of a feast held in midwinter, which is in turn supported by analysis of pig teeth found at the site.
"One of the things we can tell from the pig teeth we've looked at is that most of them have been slaughtered at nine months. And we think they are farrowing in Spring," he said.

"It's likely there's a midwinter cull and that ties in with our midwinter solstice alignments at Durrington and Stonehenge."