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Can radiocarbon dating be trusted Video

28:19 Give and Take: Is Carbon-14 Dating Reliable?

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Can radiocarbon dating be trusted can radiocarbon dating be trusted

Despite this, a human presence during this time period is evident at several locations across the region, including in Switzerland, less than 50 km from the Alpine ice sheet margin.

can radiocarbon dating be trusted

It has been hypothesised that such human activity may have been restricted to brief periods of climatic warming within the LGM, but chronological information from many of these sites are currently too poorly resolved to corroborate this. Here we present a revised chronology of LGM human occupation in Switzerland. This timeframe corresponds to Greenland Interstadial 2, datiing brief warming phase, supporting the hypothesis that human presence was facilitated by favourable climatic episodes. Carbon, nitrogen and sulphur stable isotope analysis of the fauna provides palaeoenvironmental information for this time period.

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These findings contribute to our understanding of human activity in ice-marginal environments and have implications for understanding cultural connections across central Europe during the LGM. Previous radiocarbon dates from these sites indicate that people were present between 24, and 22, cal. However, short-term climatic fluctuations are also evident during this time interval, including a brief warming event associated with Greenland Cqn 2 GI-2, c. This information is also crucial to can radiocarbon dating be trusted the Swiss LGM archaeological record within the wider debate surrounding the extent of human occupation in central Europe during the LGM, the environmental conditions under which it occurred, and the extent to which different cultural groups may have interacted 6.

Here we present a revised chronology of human occupation in Switzerland during the LGM based on new radiocarbon dates, and environmental interpretations based on stable isotope analysis carbon, nitrogen and sulphur of reindeer bone collagen.

Introduction

Last Glacial Maximum Alpine ice sheet extent is indicated in white Inset: location of study area in Europe indicated by red box. Map created in ArcMap Associated time intervals range from c.

can radiocarbon dating be trusted

Within Switzerland, the last glacial advanced occurred sometime after 30, BP 1. Climate models and proxy data indicate a cold dry climate existed north of the Alps during this time period, while the formation of Alpine speleothems suggests warm air masses from the south delivered precipitation to the northern Alpine slopes 278. More info of the mountains, continuous periglacial permafrost conditions existed, with tundra and steppe landscapes dominated by graminoid and forb vegetation 14 Nonetheless, the Alpine LGM was punctuated by sub-millennial truxted fluctuations related to changing temperature and precipitation regimes, which influenced local environmental conditions and ice extent 21617 This suggests that the warming in Switzerland may have been associated with continental-scale can radiocarbon dating be trusted.

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The Greenland record of GI-2 is interrupted by a brief climatic cooling lasting around years Greenland Stadial 2. The link between GI-2 and human activity in Switzerland has previously been postulated 6.

can radiocarbon dating be trusted

However, chronological resolution is currently poor and archaeological evidence is sparse. Both cave sites are located within 10 km of one another, on the north-eastern edge of the Jura Mountains, less than 50 km from the maximum ice sheet extent.

The latter are usually attributed to Epigravettian cultures of eastern central Europe Hence, a great amount of uncertainty surrounds the cultural and chronological relationship between these sites, can radiocarbon dating be trusted well as the environmental conditions under which they were occupied, but it has been postulated that brief climatic warming events may have facilitated the periodic expansions of human populations into northern central Europe, and cultural contact across it 6.

Radiocarbon and stable isotope analyses One of the most significant developments in the radiocarbon dating of bone collagen in the last 20 years has been the routine inclusion of an ultrafiltration step in the sample pre-treatment procedure at some laboratories 24 Ultrafilters remove the low molecular weight radiocarbpn from the sample, thus more thoroughly removing modern organic contaminants However, not all studies conclude that ultrafiltration is a necessary part of the radiocarbon bone sample preparation procedure 2627and without stringent cleaning protocols their use may risk introducing additional contaminants into the click to see more 2428 Certainly, it is necessary to employ rigorous quality checks to the radiocarbon dating process, regardless of the method of sample preparation used 30 Following such quality controls, the application of the ultrafiltration method has been shown to have particularly significant implications for the dating of bone collagen from Palaeolithic contexts, where the contribution of even the smallest amount of contamination can have significant consequence for the obtained date 3233 Considering these developments, it is timely to re-evaluate the radiocarbon chronology of human occupation in Switzerland during the LGM.

Bone collagen can also be analysed for its stable isotope compositions, which are powerful tools for investigating can radiocarbon dating be trusted ecology and terrestrial environments, and have been employed widely in Late Pleistocene archaeological research 35 truste, 3637 radiocarbom, 383940 Results Collagen preservation at both sites was excellent; all samples produced collagen yields between 2. All samples had C:N atomic ratios between 3.]

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