̽��ֱ�� of Cambridge - Cameron Petrie

Arcadia awards over £10 million for 2 major archaeology projects

Anonymous — Tue, 20 Aug 2024 14:57:42 +0000

̽��ֱ��McDonald Institute for Archaeological Research, Department of Archaeology and ̽��ֱ�� of Cambridge Development and Alumni Relations are pleased to announce that the Arcadia charitable foundation has awarded grants totalling £10.3 million to continue the work of the Mapping Africa’s Endangered Archaeological Sites and Monuments (MAEASaM) project and the Mapping Archaeological Heritage in South Asia (MAHSA) project.

Archaeological sites and monuments around the world are increasingly threatened by human activities and the impacts of climate change. These pressures are especially severe in South Asia and sub-Saharan Africa, where local heritage agencies are often short-staffed and under-resourced; where existing sites and monuments registers are often incompletely digitised; and where many sites are not yet documented and large areas remain archaeologically under-studied. Alongside the intensity of natural and human threats, these factors combine to make the implementation of planning controls, impact assessments, mitigation measures and long-term monitoring especially challenging.

̽��ֱ��five-year funding of £5.7 million to the MAEASaM project supports the continuation of its mission to identify and document endangered archaeological heritage sites across Africa, building on the work accomplished thus far with our in-country partners in Zimbabwe, Tanzania, Sudan, Senegal, Mali, Kenya, Ethiopia and Botswana. ̽��ֱ��funding will also allow the project to expand its collaborations with other national heritage agencies in Africa, including Mozambique, Gambia and the Democratic Republic of Congo, and to develop innovative approaches to better integrate heritage concerns into national planning and development control activities

During Phase 1 of the project, the MAEASaM team managed to assess a total area of 1,024,656 square kilometres using a combination of historical maps, Google Earth and medium-resolution satellite imagery, resulting in digital documentation of some 67,748 sites and monuments. Concurrent with this work, the team created digital records of 31,461 legacy sites, from unique information sets spanning almost a century of archaeological fieldwork on the continent. ̽��ֱ��accuracy of a sample of these records were also assessed via 11 field verification campaigns, helping establish the current status of these sites and levels of endangerment from anthropogenic and natural processes, while also locating many previously undocumented sites. Training, skills enhancement and knowledge transfer activities were also delivered via both in-person and online events, often in collaboration with MAHSA, and team members presented their work at 15 international meetings and via numerous social media and website posts.

Professor Paul Lane, Principal Investigator of the MAEASaM project, said: “I am truly delighted by the news of this award and would like to take this opportunity to thank Arcadia for their continuing support. As well as allowing expansion of the project to cover other countries in sub-Saharan Africa, this further 5 years of funding will enable the creation of a repository of digital assets and a sustainable system for more rapidly and easily assessing, researching, monitoring and managing archaeological heritage, accessible to heritage professionals, researchers and students across the continent.”

Similarly, the five-year grant of £4.6 million to the MAHSA project supports its continuing mission to document endangered archaeological heritage in Pakistan and India, working alongside collaborators in both countries to support their efforts to protect and manage the rich heritage of the region. Over the next 5 years, MAHSA will continue to develop and populate its Arches database, creating a resource to make heritage data findable, accessible, interoperable and reusable. MAHSA will consolidate the work it has begun in the Indus River Basin and surrounding areas, and will also expand its documentation efforts to include the coastline areas of both India and Pakistan, Baluchistan in Pakistan and the Ganges River Basin in north India.

During Phase 1, the MAHSA team georeferenced in excess of 1,300 historic Survey of India map sheets, covering over 890,000 square kilometres, and have reconstructed over 192,696 square kilometres of ancient hydrological networks. This groundwork has made it possible to digitise over 10000 legacy data records, and many of those records have been enriched. In addition, they carried out 5 collaborative archaeological surveys both as part of their training programme, and as part of new collaborative research with stakeholders in both India and Pakistan. They have engaged in policy-level dialogue with different government organisations in Pakistan and India, with an aim of working towards the development of a sustainable solution for the inclusion of heritage in urban and agricultural development strategies.

Professor Cameron Petrie, Principal Investigator of the MAHSA project, said: “I am extremely proud of what the collaborative MAHSA team have achieved during Phase 1, and the support from Arcadia for Phase 2 will allow us to continue making a transformational contribution to the documentation and understanding of the archaeological heritage of Pakistan and India. We are clarifying existing archaeological site locations datasets and collecting new ones at a scale never before attempted in South Asia.”

About Arcadia

Arcadia is a charitable foundation that works to protect nature, preserve cultural heritage and promote open access to knowledge. Since 2002 Arcadia has awarded more than $1.2 billion (£900 million) to organisations around the world.

About Mapping Africa’s Endangered Archaeological Sites and Monuments (MAEASaM)

About Mapping Archaeological Heritage in South Asia (MAHSA)

̽��ֱ��charitable foundation awards £10.3 million for the continuation of 2 Cambridge projects mapping endangered archaeological heritage in South Asia and sub-Saharan Africa.

Image from the MAEASaM Project

̽��ֱ��text in this work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. Images, including our videos, are Copyright © ̽��ֱ�� of Cambridge and licensors/contributors as identified. All rights reserved. We make our image and video content available in a number of ways – on our main website under its Terms and conditions, and on a range of channels including social media that permit your use and sharing of our content under their respective Terms.

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Prolonged droughts likely spelled the end for Indus megacities

cmm201 — Wed, 26 Apr 2023 09:42:35 +0000

̽��ֱ��beginning of this arid period — starting at around 4,200 years ago and lasting for over two centuries — coincides with the reorganisation of the metropolis-building Indus Civilization, which spanned present-day Pakistan and India.

̽��ֱ��research identified three protracted droughts — each lasting between 25 and 90 years — during this arid period. “We find clear evidence that this interval was not a short-term crisis but a progressive transformation of the environmental conditions in which Indus people lived,” said study co-author Prof Cameron Petrie, from Cambridge’s Department of Archaeology.

̽��ֱ��researchers charted historic rainfall by examining growth layers in a stalagmite collected from a cave near Pithoragarh, India. By measuring a range of environmental tracers — including oxygen, carbon and calcium isotopes — they obtained a reconstruction showing relative rainfall at seasonal resolution. They also used high-precision Uranium-series dating to get a handle on the age and duration of the droughts.

“Multiple lines of evidence allow us to piece together the nature of these droughts from different angles — and confirm they are in agreement,” said lead author of the research Alena Giesche, who conducted the research as part of her PhD in Cambridge’s Department of Earth Sciences.

Giesche and the team identified distinct periods of below-average rainfall in both the summer and winter seasons. “ ̽��ֱ��evidence for drought affecting both cropping seasons is extremely significant for understanding the impact of this period of climate change upon human populations,” said Petrie. He adds that the droughts during this period increased in duration, to the point where the third would have been multi-generational in length.

̽��ֱ��findings support existing evidence that the decline of the Indus megacities was linked to climate change. “But what’s been a mystery until now is information on the drought duration and the season they happened in,” said Giesche. “That extra detail is really important when we consider cultural memory and how people make adaptations when faced with environmental change.”

According to Petrie: “ ̽��ֱ��archaeological evidence indicates that over a 200 year period, the ancient inhabitants took various steps to adapt and remain sustainable in the face of this new normal.” During this transformation, larger urban sites were depopulated in favour of smaller rural settlements towards the eastern extent of the area occupied by Indus populations. At the same time, agriculture shifted towards reliance on summer-crops, especially drought-tolerant millets, and the population transitioned to a lifestyle that appears to have been more self-reliant.

Megadroughts have recently become a popular cause to explain a number of cultural transformations, including the Indus Valley, explains David Hodell, study co-author from Cambridge’s Department of Earth Sciences. “But the links are generally fuzzy because of difficulties involved in comparing climatic and archaeological records.” This is now changing because, “Palaeoclimate records are becoming progressively better at refining changes in rainfall on a seasonal and annual basis, which directly affects people's decision making,” said Hodell.

̽��ֱ��team are now looking to expand their climate reconstructions to western parts of the Indus River Region, where the winter rainfall system becomes more dominant than the Indian Summer Monsoon. “What we really need are more records like this, from a west-east oriented transect across the region where the summer and winter monsoons interact — and, crucially, capturing the beginning of this arid period,” said Giesche.

“Currently, we have a huge blind spot on our maps extending across Afghanistan and Pakistan where the Indian summer monsoon and the Westerlies interact,” said Prof. Sebastian Breitenbach, co-author and palaeoclimatologist at Northumbria ̽��ֱ��. “Sadly, the political situation is unlikely to allow for this kind of research in the near future."

“There’s more work to be done by both palaeoclimatologists and archaeologists,” said Hodell. “We are fortunate in Cambridge to have the two departments next door to one another.”

Tracking down how interacting rain zones influenced the Indus Civilisation has been one of the questions at the centre of the TwoRains Project, a collaboration between Cambridge and Banaras Hindu ̽��ֱ��, which was funded by the European Research Council (ERC).

Giesche, A, Hodell, D A, Petrie, C A, Haug, G A, Adkins, J F, Plessen, B, Marwan, N, Bradbury, H J, Hartland, A, French, A D, Breitenbach, S F M. 2023. Speleothem evidence for recurring summer and winter droughts post-4.2 ka in the Indus River Basin, Nature Communications Earth & Environment (2023), https://doi.org/10.1038/s43247-023-00763-z.

New research involving Cambridge ̽��ֱ�� has found evidence — locked into an ancient stalagmite from a cave in the Himalayas — of a series of severe and lengthy droughts which may have upturned the Bronze Age Indus Civilization.

Over a 200 year period, the ancient inhabitants took various steps to adapt and remain sustainable in the face of this new normal

Cameron Petrie

Alena Giesche

A section through the Dharamjali stalagmite that the authors studied.

̽��ֱ��text in this work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. Images, including our videos, are Copyright © ̽��ֱ�� of Cambridge and licensors/contributors as identified. All rights reserved. We make our image and video content available in a number of ways – as here, on our main website under its Terms and conditions, and on a range of channels including social media that permit your use and sharing of our content under their respective Terms.

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Rice farming in India much older than thought, used as 'summer crop' by Indus civilisation

fpjl2 — Mon, 21 Nov 2016 10:28:45 +0000

Latest research on archaeological sites of the ancient Indus Civilisation, which stretched across what is now Pakistan and northwest India during the Bronze Age, has revealed that domesticated rice farming in South Asia began far earlier than previously believed, and may have developed in tandem with - rather than as a result of - rice domestication in China.

̽��ֱ��research also confirms that Indus populations were the earliest people to use complex multi-cropping strategies across both seasons, growing foods during summer (rice, millets and beans) and winter (wheat, barley and pulses), which required different watering regimes. ̽��ֱ��findings suggest a network of regional farmers supplied assorted produce to the markets of the civilisation's ancient cities.

Evidence for very early rice use has been known from the site of Lahuradewa in the central Ganges basin, but it has long been thought that domesticated rice agriculture didn't reach South Asia until towards the end of the Indus era, when the wetland rice arrived from China around 2000 BC. Researchers found evidence of domesticated rice in South Asia as much as 430 years earlier.

̽��ֱ��new research is published today in the journals Antiquity and Journal of Archaeological Science by researchers from the ̽��ֱ�� of Cambridge's Division of Archaeology, in collaboration with colleagues at Banaras Hindu ̽��ֱ�� and the ̽��ֱ�� of Oxford.

"We found evidence for an entirely separate domestication process in ancient South Asia, likely based around the wild species Oryza nivara. This led to the local development of a mix of 'wetland' and 'dryland' agriculture of local Oryza sativa indica rice agriculture before the truly 'wetland' Chinese rice, Oryza sativa japonica, arrived around 2000 BC," says study co-author Dr Jennifer Bates

"While wetland rice is more productive, and took over to a large extent when introduced from China, our findings appear to show there was already a long-held and sustainable culture of rice production in India as a widespread summer addition to the winter cropping during the Indus civilisation."

Co-author Dr Cameron Petrie says that the location of the Indus in a part of the world that received both summer and winter rains may have encouraged the development of seasonal crop rotation before other major civilisations of the time, such as Ancient Egypt and China's Shang Dynasty.

"Most contemporary civilisations initially utilised either winter crops, such as the Mesopotamian reliance on wheat and barley, or the summer crops of rice and millet in China - producing surplus with the aim of stockpiling," says Petrie.

"However, the area inhabited by the Indus is at a meteorological crossroads, and we found evidence of year-long farming that predates its appearance in the other ancient river valley civilisations."

̽��ֱ��archaeologists sifted for traces of ancient grains in the remains of several Indus villages within a few kilometers of the site called Rakhigari: the most recently excavated of the Indus cities that may have maintained a population of some 40,000.

As well as the winter staples of wheat and barley and winter pulses like peas and vetches, they found evidence of summer crops: including domesticated rice, but also millet and the tropical beans urad and horsegram, and used radiocarbon dating to provide the first absolute dates for Indus multi-cropping: 2890-2630 BC for millets and winter pulses, 2580-2460 BC for horsegram, and 2430-2140 BC for rice.

Millets are a group of small grain, now most commonly used in birdseed, which Petrie describes as "often being used as something to eat when there isn't much else". Urad beans, however, are a relative of the mung bean, often used in popular types of Indian dhal today.

In contrast with evidence from elsewhere in the region, the village sites around Rakhigari reveal that summer crops appear to have been much more popular than the wheats of winter.

̽��ֱ��researchers say this may have been down to the environmental variation in this part of the former civilisation: on the seasonally flooded Ghaggar-Hakra plains where different rainfall patterns and vegetation would have lent themselves to crop diversification - potentially creating local food cultures within individual areas.

This variety of crops may have been transported to the cities. Urban hubs may have served as melting pots for produce from regional growers, as well as meats and spices, and evidence for spices have been found elsewhere in the region.

While they don't yet know what crops were being consumed at Rakhigarhi, Jennifer Bates points out that: "It is certainly possible that a sustainable food economy across the Indus zone was achieved through growing a diverse range of crops, with choice being influenced by local conditions.

"It is also possible that there was trade and exchange in staple crops between populations living in different regions, though this is an idea that remains to be tested."

"Such a diverse system was probably well suited to mitigating risk from shifts in climate," adds Cameron Petrie. "It may be that some of today's farming monocultures could learn from the local crop diversity of the Indus people 4,000 years ago."

̽��ֱ��findings are the latest from the Land, Water and Settlement Project, which has been conducting research on the ancient Indus Civilisation in northwest India since 2008.

Thought to have arrived from China in 2000 BC, latest research shows domesticated rice agriculture in India and Pakistan existed centuries earlier, and suggests systems of seasonal crop variation that would have provided a rich and diverse diet for the Bronze Age residents of the Indus valley.

Our findings appear to show there was already a long-held and sustainable culture of rice production in India as a widespread summer addition to the winter cropping during the Indus civilisation

Jennifer Bates

Cameron Petrie

Zebu cattle pulling a wagon beside a pond at the Indus Civilisation site of Rakhigarhi in northwest India

̽��ֱ��text in this work is licensed under a Creative Commons Attribution 4.0 International License. For image use please see separate credits above.

Yes

Decline of Bronze Age ‘megacities’ linked to climate change

lw355 — Thu, 27 Feb 2014 12:57:09 +0000

Scientists have demonstrated that an abrupt weakening of the summer monsoon affected northwest India 4,100 years ago. ̽��ֱ��resulting drought coincided with the beginning of the decline of the metropolis-building Indus Civilisation, which spanned present-day Pakistan and India, suggesting that climate change could be why many of the major cities of the civilisation were abandoned.

̽��ֱ��research, reported this week in the journal Geology, involved the collection of snail shells preserved in the sediments of an ancient lake bed. By analysing the oxygen isotopes in the shells, the scientists were able to tell how much rain fell in the lake where the snails lived thousands of years ago.

̽��ֱ��results shed light on a mystery surrounding why the major cities of the Indus Civilisation were abandoned. Climate change had been suggested as a possible reason for this transformation before but, until now, there has been no direct evidence for climate change in the region where Indus settlements were located.

Moreover, the finding now links the decline of the Indus cities to a documented global scale climate event and its impact on the Old Kingdom in Egypt, the Early Bronze Age civilisations of Greece and Crete, and the Akkadian Empire in Mesopotamia, whose decline has previously been linked to abrupt climate change.

“We think that we now have a really strong indication that a major climate event occurred in the area where a large number of Indus settlements were situated,” said Professor David Hodell, from Cambridge’s Department of Earth Sciences. “Taken together with other evidence from Meghalaya in northeast India, Oman and the Arabian Sea, our results provide strong evidence for a widespread weakening of the Indian summer monsoon across large parts of India 4,100 years ago.”

Hodell together with ̽��ֱ�� of Cambridge archaeologist Dr Cameron Petrie and Gates scholar Dr Yama Dixit collected Melanoides tuberculata snail shells from the sediments of the ancient lake Kotla Dahar in Haryana, India. “As today, the major source of water into the lake throughout the Holocene is likely to have been the summer monsoon,” said Dixit. “But we have observed that there was an abrupt change, when the amount of evaporation from the lake exceeded the rainfall – indicative of a drought.”

At this time large parts of modern Pakistan and much of western India was home to South Asia’s great Bronze Age urban society. As Petrie explained: “ ̽��ֱ��major cities of the Indus civilisation flourished in the mid-late 3rd and early 2nd millennium BC. Large proportions of the population lived in villages, but many people also lived in ‘megacities’ that were 80 hectares or more in size – roughly the size of 100 football pitches. They engaged in elaborate crafts, extensive local trade and long-ranging trade with regions as far away as the modern-day Middle East. But, by the mid 2nd millennium BC, all of the great urban centres had dramatically reduced in size or been abandoned.”

Many possible causes have been suggested, including the claim that major glacier-fed rivers changed their course, dramatically affecting the water supply and the reliant agriculture. It has also been suggested that an increasing population level caused problems, there was invasion and conflict, or that climate change caused a drought that large cities could not withstand long-term.

“We know that there was a clear shift away from large populations living in megacities,” said Petrie. “But precisely what happened to the Indus Civilisation has remained a mystery. It is unlikely that there was a single cause, but a climate change event would have induced a whole host of knock-on effects.

“We have lacked well-dated local climate data, as well as dates for when perennial water flowed and stopped in a number of now abandoned river channels, and an understanding of the spatial and temporal relationships between settlements and their environmental contexts. A lot of the archaeological debate has really been well-argued speculation.”

̽��ֱ��new data, collected with funding from the Natural Environment Research Council, show a decreased summer monsoon rainfall at the same time that archaeological records and radiocarbon dates suggest the beginning of the Indus de-urbanisation. From 6,500 to 5,800 years ago, a deep fresh-water lake existed at Kotla Dahar. ̽��ֱ��deep lake transformed to a shallow lake after 5,800 years ago, indicating a weakening of the Indian summer monsoon. But an abrupt monsoon weakening occurred 4,100 years ago for 200 years and the lake became ephemeral after this time.

Until now, the suggestion that climate change might have had an impact on the Indus Civilisation was based on data showing a lessening of the monsoon in Oman and the Arabian Sea, which are both located at a considerable distance from Indus Civilisation settlements and at least partly affected by different weather systems.

Hodell and Dixit used isotope geochemical analysis of shells as a proxy for tracing the climate history of the region. Oxygen exists in two forms – the lighter ¹⁶O and a heavier ¹⁸O variant. When water evaporates from a closed lake (one that is fed by rainfall and rivers but has no outflow), molecules containing the lighter isotope evaporate at a faster rate than those containing the heavier isotopes; at times of drought, when the evaporation exceeds rainfall, there is a net increase in the ratio of ¹⁸O to ¹⁶O of the water. Organisms living in the lake record this ratio when they incorporate oxygen into the calcium carbonate (CaCO3) of their shells, and can therefore be used, in conjunction with radiocarbon dating, to reconstruct the climate of the region thousands of years ago.

Speculating on the effect lessening rainfall would have had on the Indus Civilisation, Petrie said: “Archaeological records suggest they were masters of many trades. They used elaborate techniques to produce a range of extremely impressive craft products using materials like steatite, carnelian and gold, and this material was widely distributed within South Asia, but also internationally. Each city had substantial fortification walls, civic amenities, craft workshops and possibly also palaces. Houses were arranged on wide main streets and narrow alleyways, and many had their own wells and drainage systems. Water was clearly an integral part of urban planning, and was also essential for supporting the agricultural base.

At around the time we see the evidence for climatic change, archaeologists have found evidence of previously maintained streets start to fill with rubbish, over time there is a reduced sophistication in the crafts they used, the script that had been used for several centuries disappears and there were changes in the location of settlements, suggesting some degree of demographic shift.”

“We estimate that the climate event lasted about 200 years before recovering to the previous conditions, which we still see today, and we believe that the civilisation somehow had to cope with this prolonged period of drought,” said Hodell.

̽��ֱ��new research is part of a wider joint project led by the ̽��ֱ�� of Cambridge and Banaras Hindu ̽��ֱ�� in India, which has been funded by the British Council UK-India Education and Research Initiative to investigate the archaeology, river systems and climate of north-west India using a combination of archaeology and geoscience. ̽��ֱ��multidisciplinary project hopes to provide new understanding of the relationships between humans and their environment, and also involves researchers at Imperial College London, the ̽��ֱ�� of Oxford, the Indian Institute of Technology Kanpur and the Uttar Pradesh State Archaeology Department.

“It is essential to understand the link between human settlement, water resources and landscape in antiquity, and this research is an important step in that direction,” explained Petrie. “We hope that this will hold lessons for us as we seek to find means of dealing with climate change in our own and future generations.”

Inset image upper: one of the snail shells collected for the study.

Inset image lower: Cameron Petrie in the field.

Climate change may have contributed to the decline of a city-dwelling civilisation in Pakistan and India 4,100 years ago, according to new research.

They engaged in elaborate crafts, extensive local trade and long-ranging trade with regions as far away as the modern-day Middle East. But, by the mid 2nd millennium BC, all of the great urban centres had dramatically reduced in size or been abandoned

Cameron Petrie

Amir Taj

Indus script

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