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Old 03-26-2009, 12:17 PM   #1
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Default New Technology For Dating Ancient Rock Paintings


A new dating method finally is allowing archaeologists to incorporate rock paintings — some of the most mysterious and personalized remnants of ancient cultures — into the tapestry of evidence used to study life in prehistoric times.

In the study, Marvin W. Rowe points out that rock paintings, or pictographs, are among the most difficult archaeological artifacts to date. They lack the high levels of organic material needed to assess a pictograph's age using radiocarbon dating, the standard archaeological technique for more than a half-century.

Rowe describes a new, highly sensitive dating method, called accelerator mass spectrometry, that requires only 0.05 milligrams of carbon (the weight of 50 specks of dust). That's much less than the several grams of carbon needed with radiocarbon dating.

The research included analyzing pictographs from numerous countries over a span of 15 years. It validates the method and allows rock painting to join bones, pottery and other artifacts that tell secrets of ancient societies, Rowe said. "Because of the prior lack of methods for dating rock art, archaeologists had almost completely ignored it before the 1990s," he explained. "But with the ability to obtain reliable radiocarbon dates on pictographs, archaeologists have now begun to incorporate rock art into a broader study that includes other cultural remains."

For more, including journal references, see Science Daily.

World Famous Rock Paintings Three-times Older Than Previously Thought
ScienceDaily (Feb. 9, 2004) — Some of the world's finest rock paintings are more than three times older than previously believed, according to researchers from British and Australian universities who used the latest radio-carbon dating technology.

Previous work of the age of the rock art in South Africa's uKhahlamba-Drakensberg, a World Heritage Site, concluded it is less than 1,000 years old. But the new study, by archaeologists from the University of Newcastle upon Tyne, UK, and Australian National University in Canberra, estimate the panels were created up to 3,000 years ago.

The findings, published in the current edition of the academic journal South African Humanities *, have major implications for our understanding of how the rock artists lived and the social changes that were taking place over the last three millennia.

When Europeans first encountered the rock paintings in the mountainous uKhahlamba-Drakensberg region, around 150 years ago, they considered it primitive and crude. Today, experts consider the area to be one of the top areas in the world for rock art, with the largest and most concentrated group of paintings in Africa south of the Sahara. Over 40,000 paintings exist in 500 rock shelters.

The artwork, made by the San hunter-gatherers who first settled in the area around 8,000 years ago, was made using mainly black, white, red and orange pigments. It depicts animal and human scenes and are said to represent the religious beliefs of the San, whose occupation of the mountains ended in tragic circumstances in the nineteenth century following their conflict with European colonists. Subjects include the indigenous eland (a large, spiral-horned antelopes) and huntsmen.

Until recently, archaeologists have struggled to tell exactly how old the paintings were, mainly because dating techniques have required larger samples for analysis than it has been possible to collect without destroying the art work.

However, the research team analysed salt samples taken from rocks adorned with the paintings using a new highly-refined radiocarbon dating technique known as accelerator mass spectrometry (AMS).

The results showed some of the paintings are up to 3,000 years old. Experts suspect they could be even older due to the San people's long occupation of the area but say they need to carry out further tests to prove this theory.

Dr Aron Mazel, a South African researcher, formerly of the Natal Museum in Pietermaritzburg, South Africa, and now based at the University of Newcastle upon Tyne, who carried out the work with Australian archaeologist Dr Alan Watchman, said:

"This is a small but important step forward in the interpretation of some of the world's finest collection of rock art. The data will contribute to a much wider understanding of one of the key periods in South African and world history, the occupation of the uKhahlamba-Drakensberg by the San hunter-gatherers.

"We hope to use this technique to date more of the paintings and organise them in chronological order in the hope that, like a family photograph album, they can tell us a little more about how life evolved for the San people during the several thousands of years they occupied the mountains.

"For example, how did their society change, and how did their beliefs change with it? Was there periods of stress that led to increased episodes of painting? Did the themes of the paintings develop over time? So many questions like this are unanswered at the moment."

Dr Mazel, of Newcastle University's School of Historical Studies, added: "We are still in the early stages of exploiting this new technology but it's possible further investigation could reveal that some of the paintings could be even older than 3,000 years, especially as we knew the San people first occupied the area 8,000 years ago."

Dr Chris Chippindale, reader in archaeology at Cambridge University and professor with the Rock Art Research Institute, University of the Witwatersrand, South Africa, said:

"The uKhahlamba-Drakensberg sequence is one of the great riches in rock art, and rock art is one of the great riches in archaeology. The pictures are a direct firsthand record of the world that ancient people lived in, experienced, and understood.

"Dating is important to all archaeology and rock art has proved very hard to date. It looks as if the uKhahlamba-Drakensberg rock art sequence may be very long. Any new study which tells us reliably about its age is very much to be welcomed."

The research has been supported by the Anglo American Chairman's Fund in South Africa.


Further information about the uKhahlamba-Drakensberg rock art: http://www.drakensberg-tourism.com/b...-rock-art.html


Adapted from materials provided by University Of Newcastle Upon Tyne.

Last edited by Antaletriangle; 03-26-2009 at 12:19 PM.
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