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paleoanthropology, genetics and evolution

iron age

  • Ice maiden returns

    Fri, 2012-08-24 23:35 -- John Hawks

    The Siberian Times is running a long, detailed story on the return of the Ukok Princess, or "Ice Maiden" to the Altai Republic: "Siberian princess reveals her 2500-year-old tattoos".

    'Compared to all tattoos found by archeologists around the world, those on the mummies of the Pazyryk people are the most complicated, and the most beautiful,' said Dr Polosmak.

    'More ancient tattoos have been found, like the Ice Man found in the Alps - but he only had lines, not the perfect and highly artistic images one can see on the bodies of the Pazyryks.

    'It is a phenomenal level of tattoo art. Incredible.'

    I wrote about the Ukok Princess and the archaeology of the Altai earlier this year, based on my visit there last summer: "The anthropologist and the kurgans". The new article has some beautiful line art of the tattoos and also discusses the original excavations of the Ukok Plateau kurgans. My post also touched on much earlier archaeological cultures. It's very relevant to this week's story about the origin of Indo-European languages, which likely included the Pazyryk peoples.

  • Dead Marshes in Denmark

    Thu, 2012-08-23 00:41 -- John Hawks

    ScienceNordic describes an incredible Iron Age archaeological dig in Denmark: "An entire army sacrificed in a bog".

    Archaeologists have spent all summer excavating a small sample of what has turned out to be a mass grave containing skeletal remains from more than 1,000 warriors, who were killed in battle some 2,000 years ago.

    ...

    The army beneath the bog may have been defeated and killed in a battlefield located far away from Alken Wetlands.

    Hertz says that if this were the case, it must have been a massive logistical task for Iron Age people to transport the bones to the lake.

    It's just like the Lord of the Rings! Ancient army that nobody remembers with bodies beneath the waters. Except, of course, these are bones. That sat on a battlefield to be ravaged by scavengers, and then secondarily tossed.

  • The anthropologist and the kurgans

    Wed, 2012-06-06 15:39 -- John Hawks

    There are many stories from my travels last summer that I haven't yet told here. I've been thinking that I need to get them written down, so that I'll have more time to write about my upcoming travel this summer. I have copious notes about the time in Denisova itself, and I'll be returning to those. In the meantime I'd like to share some other experiences. Here I want to turn to the subject of kurgans.

    Altai landscape

    An Altai landscape

    I went to the Altai for the Paleolithic, because Neandertals and Denisovans lived in the area for tens of thousands of years. But the area is even better known for much later remains, from the Neolithic and Bronze Age up to the Iron Age. A succession of ancient cultures lived in this region, at the crossroads of China, the Tibetan Plateau, Mongolia, and the Russian and Kazakh steppes. Most of the prehistoric peoples of the Altai were pastoralists, nomads who depended on herding cattle, sheep, and horses. Keeping their wealth and food sources on the hoof instead of in the ground, they moved between summer and winter foraging grounds for their herds. They also relied heavily on hunting the rich game in the region, notably red deer.

    Denisova Cave itself was used by these early herders. People kept sheep fenced in the cave, every so often burning the accumulated manure and bedding and imperfectly sweeping the ashes. The topmost levels of the archaeological deposits are densely stratified layers of burned ash and debris, left across thousands of years.

    Denisova layers

    Denisova archaeological layers dating to the Holocene. The thin contrasting layers here at the top of the deposit include Neolithic and later burned sheep debris.

    Many Altayan people today live in towns, made of Russian-style wood houses. The economy is still heavily based on cattle, and additionally there are large red deer operations. Horses are even today a large part of the culture, and every town seems to have its stadium for the local equivalent of polo. People of traditional Altayan ancestry are a minority even in the Altai Republic, with other nationalities and ethnic Russians making up more than half the population. Altayan houses in the towns are quite distinctive because many of them have a round "summer house" next to them. These mirror the portable yurts that were the traditional summer domiciles of the Altai peoples, giving them a chance to get out of their winter houses and sleep beneath a round roof during the warmer part of the year.

    Altai town

    An Altai town. A few of the foreground houses have round "summer houses" in their yards.

    Among the earliest cattle herders in the area were people of the Afanasievo culture. These people moved into the Altai area around 4800 years ago and persisted for nearly 1000 years. They lived before metallurgy really became very common in this area, although metal objects are sometimes found in their graves. Like other nomads, their residence sites were relatively ephemeral and their burial sites give us essential information not only about their social lives but also about their economy and subsistence practices.

    Afanasievo kurgan

    An Afanasievo kurgan.

    Mound-like burial sites in this part of the world are called kurgans, and often involve both stones and earthwork. Some Afanasievo kurgans are quite distinctive, with a round circle of upright, flat stones. Sometimes these are tall, like the petals of a rocky sunflower. Sometimes, they are barely higher than the mound within, almost forming a curb around its edge.

    Afanasievo kurgan, detail

    Detail of stones surrounding an Afanasievo kurgan.

    I've driven through a lot of Kansas cattle pasture, and the texture of the land here was familiar. Here in Wisconsin, we have some extensive Mississipian and earlier moundworks, but many have been plowed and often destroyed, after less than a thousand years. In the Altai, running across 4000-year-old stone formations, basically undisturbed on the pasture surface -- that was pretty cool.

    Afanasievo kurgan with horses

    Detail of an Afanasievo kurgan, horses grazing in background.

    Of course, "undisturbed" is a relative concept. Most of the kurgans have undergone some amount of grave-robbing. For the elaborate later mounds, the plundering often really changed their profile. The Afanasievo kurgans, with their relatively flat shape and haphazard stone paving, don't make disruptions quite as evident.

    Another Afanasievo kurgan

    Another Afanasievo kurgan.

    Many archaeologists believe the Afanasievo people to have been speakers of an early Indo-European language. The kurgans and stylistic elements of Afanasievo culture are similar to those found later much further to the west, across the Russian steppe. Possibly the Afanasievo people were connected to the Tocharians, whose Indo-European language is attested by inscriptions from the far west of China before 1000 BC.

    By far the more famous kurgan-building people were carriers of the Pazyryk culture. These people lived much later than Afanasievo in the area, within the first millennium BC. They used bronze and iron, and lived at the eastern end of a cultural complex that extended across the Russian plain to the area north of the Black Sea. The Greeks contacted the westernmost of these people, the Scythians, and the high mobility and extensive trade through Central Asia certainly indicates a cultural continuity if not identity from east to west across this range.

    The Pazyryk kurgans were huge mounds, made up of volleyball-sized stones. We clambered across a couple of these near a main road in the middle Altai.

    A Pazyryk kurgan

    A Pazyryk kurgan.

    Kurgans were mounded atop a timber-roofed grave chamber, which included one or more bodies and elaborate grave goods. One kurgan produced a wheeled chariot with horses, giving some impression as to their scale. The kurgans we examined had been excavated by archaeologists during the 1920's, and both now have a large hole in the middle where the grave had been. One had a large larch tree growing up out of the center:

    Another kurgan, with larch tree growing in center

    Strange place for a tree.

    Rainwater seeped into the Pazyryk kurgans, deep into the tombs themselves, and there the water froze into ice. Many of the mounds were large enough to keep ice frozen year-round. Although most were plundered by ancient graverobbers, archaeologists found a few spectacular instances where textiles and other perishable materials were preserved.

    Pazyryk fabric sample

    A sample of ancient fabric, at the museum of the Archaeology Institute in Novosibirsk

    You won't be surprised to know that, for me, the most interesting discoveries from the Pazyryk kurgans were the physical remains of the people themselves. The extensive effort toward building the mounds, and valuables included in the burials, signify that the kurgan bodies were some of the highest-status individuals in Pazyryk society. High-status people were not exclusively high-ranking males or warriors, they sometimes were females.

    Since 1993, the most famous of the kurgan discoveries has been the mummified woman known as the "Ice Maiden". This mummy was found by Natalia Polosnak, as she excavated a kurgan on the Ukok Plateau in the border area between Russia and China. Dating to the fifth century BC, the mummy was the subject of a massive effort to defrost and transport her body by helicopter for study, which was the subject of a documentary.

    Ice Maiden

    The Ice Maiden in the museum in Novosibirsk

    Her skin provides the earliest known evidence of tattooing anywhere in the world. Probably tattoos are much more ancient than this -- personally, I'm betting that both Neandertals and Middle Stone Age Africans were using mineral pigments and charcoal in tattoos. But the few instances in which we have earlier skin preserved, such as the ancient Egyptians, simply were not tattooing cultures.

    The ice maiden's tattoo

    The Ice Maiden's tattoo

    In the case of the Ice Maiden, her tattoo is a beautiful example of the elaborately antlered red deer, so typical of Pazyryk decorative objects. For example, here is a bronze red deer bangle:

    A bronze red deer

    A bronze red deer

    That red deer motif is really common in this area of the world, found as portable objects, as sometimes elaborately-carved inscriptions on stelae, and on fabrics. This iconography is much older than the Pazyryk culture, found well into the second millennium BC in Mongolia. There, carved stelae called "deer stones" appear at a particular type of burial site. These stones seem to represent stylized warrior figures, equipped sometimes with belts and weapons, for which the deer (and sometimes other animal) inscriptions may represent tattoos.

    Deer stones do occur in the Altai, but I didn't run across any of them during my time there. I did see many simpler stelae, sometimes by themselves and sometimes in groups. These burial markers can be found across thousands of years of different cultures. Most of the ones are probably attributable to more recent peoples in the area within the last 2000 years.

    Stela

    A second Pazyryk mummy lay next to the Ice Maiden in the museum. This mummy, a man, also bears a tattoo: a canine of some sort, if I remember correctly. The mummy has long, ashen-blond hair. The hair of mummies is sometimes misleading, beacuse the pigments can be affected by their burial. But the Tarim Basin mummies from China, dating to more than a thousand years before this man, also had light, sometimes reddish hair. It will be fascinating to learn more about the genetics of these ancient people, to see the ways they are connected to later populations in the region and elsewhere.

    Pazyryk male mummy

    The male mummy

    Some truly recent grave sites in the area can also carry great anthropological interest. For example, the Pazyryk kurgans we saw weren't alone. Next to them, the nearby town had put a modern cemetery.

    Cemetery next to kurgan

    The local cemetery

    A close look at the markers in this cemetery shows that they often have pictures of the deceased.

    Altai cemetery

    The local cemetery

    Surprisingly, many of them include inscriptions in Korean. Southern Siberia was a resettlement area for many Korean nationalists, who left Korea during the Japanese occupation.

    It is fascinating that this area was central to ancient trade and communication routes, but today seems so removed from the main arteries of international transit. I've never been anywhere with so few jets passing far overhead, and no major highways or rail routes pass through the area. Yet, when we look at the composition of the population, there are people who immigrated from far-flung areas to this corner of the world. The Altai draws people into it today, just as it has done for thousands of years.

    Synopsis: 
    I recount some of my summer 2011 trip to the Altai, focusing on Afanasievo and Pazyryk archaeology
  • Early iron in Africa

    Mon, 2009-01-12 14:07 -- John Hawks

    The dawn of ironworking in Africa is a hot anthropological topic. My own interests in demographic growth and dispersals depends very closely on the chronology of ironworking in Africa, because the advent of iron may have enabled faster conversion of land to agriculture.

    Many anthropologists believe that the dispersal of the Bantu languages may be traced to an agricultural explosion driven by iron technology. Others dispute this connection, raising doubts about whether the ironworking chronology can match the timing this dispersal. Both these have some wiggle-room in their dating, as do the times of introduction or domestication of various crop species.

    For the purposes of our paper last year, it was sufficient to know that populations grew in Africa after roughly 2000 BC. But to test hypotheses about gene dispersal and selection among African populations -- data that are now available -- we have to be a bit more precise.

    Last week's Science includes a summary article by Heather Pringle, which discusses the controversy over the chronology of African ironworking.

    Now controversial findings from a French team working at the site of Ôboui in the Central African Republic challenge the diffusion model. Artifacts there suggest that sub-Saharan Africans were making iron by at least 2000 B.C.E. and possibly much earlier--well before Middle Easterners, says team member Philippe Fluzin, an archaeometallurgist at the University of Technology of Belfort-Montbéliard in Belfort, France. The team unearthed a blacksmith's forge and copious iron artifacts, including pieces of iron bloom and two needles, as they describe in a recent monograph, Les Ateliers d'Ôboui, published in Paris. "Effectively, the oldest known sites for iron metallurgy are in Africa," Fluzin says.

    Some researchers are impressed, particularly by a cluster of consistent radiocarbon dates.

    And, as you might expect:

    Others, however, raise serious questions about the new claims.

    The article casts the debate as an opposition between a diffusionist hypothesis (metallurgy entered Africa from the Near East) and local development. That's appropriate, since this pattern of opposition is one of the oldest stories in archaeology. But I'm more interested in the dates and resulting population dynamics. How did technology relate to demographic growth, and how were genes affected by these processes?

    The article makes the early development of ironworking in Africa seem very credible, particularly if the only other option is a late introduction via Carthage or the Nile corridor. It is not obvious how much of the apparent controversy is about the early dates from this one site in particular, and how much is about the presence of pre-first-millennium BCE ironworking generally. Critics raise various scenarios for the contamination of radiocarbon dates by old carbon. This always reminds me about how much error may lie within Paleolithic dates if we have to worry about contamination in Iron Age sites!

    Well, more on this issue later.

    References:

    Pringle H. 2009. Seeking Africa's first Iron Men. Science 323:200-202. doi:10.1126/science.323.5911.200

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Neandertals

For years, I've worked on their bones. Now I'm working on their genes. Read more about the science studying these ancient people.

Denisova

From a finger bone of an ancient human came the record of a completely unexpected population. My lab is working on the science of the Denisova genome.

Acceleration

The advent of agriculture caused natural selection to speed up greatly in humans. We're uncovering some of the ways that populations have rapidly changed during the last 10,000 years.

Malapa

Just outside Johannesburg, the Malapa site is producing some of the most exciting finds in human evolution. This site is the headquarters of the Malapa Soft Tissue Project.