Friday, January 28, 2022

Climate change in the Early Holocene - archaeology report

New insight into how our early ancestors dealt with major shifts in climate is revealed in research by an international team, led by Professor Rick Schulting from Oxford University’s School of Archaeology.

  • Radiocarbon dating from a prehistoric cemetery in Northern Russia reveals human stress caused by a global cooling event 8,200 years ago.
  • Early hunter gatherers developed more complex social systems and, unusually, a large cemetery when faced by climate change

Published in Nature Ecology & Evolution, the report reveals, new radiocarbon dates show the large Early Holocene cemetery of Yuzhniy Oleniy Ostrov, at Lake Onega, some 500 miles north of Moscow, previously thought to have been in use for many centuries, was, in fact, used for only one to two centuries. Moreover, this seems to be in response to a period of climate stress.

"The team believes the creation of the cemetery reveals a social response to the stresses caused by regional resource depression...[it] would have helped define group membership for what would have been previously dispersed bands of hunter-gatherers - mitigating potential conflict over access to the lake’s resources"

The team believes the creation of the cemetery reveals a social response to the stresses caused by regional resource depression. At a time of climate change, Lake Onega, as the second largest lake in Europe, had its own ecologically resilient microclimate. This would have attracted game, including elk, to its shores while the lake itself would have provided a productive fishery. Because of the fall in temperature, many of the region’s shallower lakes could have been susceptible to the well-known phenomenon of winter fish kills, caused by depleted oxygen levels under the ice.

The creation of the cemetery at the site would have helped define group membership for what would have been previously dispersed bands of hunter-gatherers - mitigating potential conflict over access to the lake’s resources. But when the climate improved, the team found, the cemetery largely went out of use, as the people presumably returned to a more mobile way of life and the lake became less central.

The behavioral changes - to what could be seen as a more ‘complex’ social system, with abundant grave offerings – were situation-dependent. But they suggest the presence of important decision makers and, say the team, the findings also imply that early hunting and gathering communities were highly flexible and resilient.

"But when the climate improved, the team found, the cemetery largely went out of use, as the people presumably returned to a more mobile way of life and the lake became less central."

The results have implications for understanding the context for the emergence and dissolution of socioeconomic inequality and territoriality under conditions of socio-ecological stress.

Plan of the cemetery,
created by Rick Schulting
Radiocarbon dating of the human remains and associated animal remains at the site reveals that the main use of the cemetery spanned between 100-300 years, centering on ca. 8250 to 8,000 BP. This coincides remarkably closely with the 8.2 ka dramatic cooling event, so this site could provide evidence for how these humans responded to a climate-driven environmental change.

The Holocene (the current geological epoch which began approximately 11,700 years before present) has been relatively stable in comparison to current events. But there are a number of climate fluctuations recorded in the Greenland ice cores. The best known of these is the 8,200 years ago cooling event, the largest climatic downturn in the Holocene, lasting lasted one to two centuries. But there is little evidence that the hunter-gatherers, who occupied most of Europe at this time, were much affected, and if they were, in what specific ways.

"There are a number of climate fluctuations recorded in the Greenland ice cores. The best known is the 8,200 years ago cooling event, the largest climatic downturn in the Holocene, lasting lasted one to two centuries."

Yuzhniy Oleniy Ostrov is one of the largest Early Holocene cemeteries in northern Eurasia, with up to 400 possible graves, 177 of which were excavated in the 1930s by a team of Russian archaeologists. Based on their work, the cemetery site has an important position in European Mesolithic studies, in part because of the variation in the accompanying grave offerings. Some graves lack these entirely, to those with abundant and elaborate offerings.

This research was supported by the Natural Environment Research Council (UK) (NF/2016/1/5) and by the Social Science and Humanities Research Council of Canada (grant nos. 412-2011-1001 and 895-2018-1004). The Kone Foundation also contributed. Thanks to the Peter the Great Museum of Anthropology and Ethnography/Kunstkamera, St. Petersburg, Russia, for permitting access to the collections in their care.

The team includes: Rick J. Schulting; Kristiina Mannermaa; Pavel E. Tarasov; Thomas Higham; Christopher Bronk Ramsey; Valeri Khartanovich; Vyacheslav Moiseyev; Dmitriy Gerasimov; John O’Shea; Andrzej Weber.

Source/Credit: University of Oxford

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