Bayesian analysis of radiocarbon dates
TLDR
An overview of the main model components used in chronological analysis, their mathematical formulation, and examples of how such analyses can be performed using the latest version of the OxCal software (v4) are given.Abstract:
If radiocarbon measurements are to be used at all for chronological purposes, we have to use statistical methods for calibration. The most widely used method of calibration can be seen as a simple application of Bayesian statistics, which uses both the information from the new measurement and information from the 14C calibration curve. In most dating applications, however, we have larger numbers of 14C measurements and we wish to relate those to events in the past. Bayesian statistics provides a coherent framework in which such analysis can be performed and is becoming a core element in many 14C dating projects. This article gives an overview of the main model components used in chronological analysis, their mathematical formulation, and examples of how such analyses can be performed using the latest version of the OxCal software (v4). Many such models can be put together, in a modular fashion, from simple elements, with defined constraints and groupings. In other cases, the commonly used "uniform phase" models might not be appropriate, and ramped, exponential, or normal distributions of events might be more useful. When considering analyses of these kinds, it is useful to be able run simulations on synthetic data. Methods for performing such tests are discussed here along with other methods of diagnosing possible problems with statistical models of this kind.read more
Citations
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Journal ArticleDOI
Collapse of marine-based outlet glaciers from the Scandinavian Ice Sheet
Jan Mangerud,Jan Mangerud,Brent M. Goehring,Øystein S. Lohne,Øystein S. Lohne,John Inge Svendsen,John Inge Svendsen,Richard Gyllencreutz +7 more
TL;DR: In this paper, the authors present a reconstruction of the timing and retreat rates of more than 2000m thick Younger Dryas (YD) fjord glaciers in western Norway using a detailed chronology of 10 Be exposure ages from lateral moraines and 14 C dated end morainees.
Journal ArticleDOI
Using an independent geochronology based on palaeomagnetic secular variation (PSV) and atmospheric Pb deposition to date Baltic Sea sediments and infer 14C reservoir age
Bryan C Lougheed,Ian Snowball,Matthias Moros,Karoline Kabel,Raimund Muscheler,Joonas J. Virtasalo,Lukas Wacker +6 more
TL;DR: In this article, the results of multiple dating methods carried out on cores in the Gotland Deep area of the Baltic Sea were presented, with particular emphasis on the Littorina stage (8 ka ago to the present) and possible changes in the C-14 reservoir age of our dated samples.
Journal ArticleDOI
Reduced deep ocean ventilation in the Southern Pacific Ocean during the last glaciation persisted into the deglaciation
TL;DR: Using tephras as stratigraphic tie points with which to estimate past atmospheric Δ14C, this article reconstructed a series of deep radiocarbon ages for several time slices from the last glaciation through the deglaciation and Holocene in the Southwestern Pacific.
Journal ArticleDOI
Prehistoric herding facilities: site formation processes and archaeological dynamics in Cova Gran de Santa Linya (Southeastern Prepyrenees, Iberia)
TL;DR: In this article, a combination of micromorphological and stratigraphic analyses and radiometric dating of the pen deposits recorded at the site was used to confirm the cyclical stabling of ovicaprids in the rockshelter.
Palaeoenvironmental implications of evaporative Gaylussite crystals from Lonar lake, Central India
Ambili Anoop,Sushma Prasad,Birgit Plessen,Nathani Basavaiah,Birgit Gaye,Rudolf Naumann,Philip Menzel,Stephan M. Weise,Achim Brauer +8 more
TL;DR: In this paper, petrographic, mineralogical, geochemical and isotopic investigations on carbonate minerals found within a 10m-long core from Lonar Lake, central India, with the aim of evaluating their potential as palaeoenvironmental proxies were conducted.
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