Another site, same old song: The Pleistocene-Holocene archaeological sequence of Toca da Janela da Barra do Antonião-North, Piauí, Brazil

Lahaye, Christelle; Guérin, Guillaume; Gluchy, María; Hatté, Christine; Fontugne, Michel; Clemente‐Conte, Ignacio; Santos, Janaina C.; Villagrán, Ximena; Costa, Amélie Da; Borges, Carolina de Campos; Guidon, Niède; Boëda, Éric

doi:10.1016/j.quageo.2018.03.006

Cited by 26 publications

(16 citation statements)

References 36 publications

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“…OSL ages were obtained from quartz fractions extracted from the sediment samples, after mechanical and chemical treatments (see, for example, for methods commonly used in CRP2A laboratory: [17,18]). Methods used to determine the equivalent Dose (D e ) using single-aliquot regenerative dose protocol (SAR) [48][49][50] and applying the Central Age Model (CAM [51]) or the BaSar approach [52,53] were detailed in Lahaye et al [18].…”

Section: Discussionmentioning

confidence: 99%

“…Since 2008, the Franco-Brazilian Mission of Piauí (FBMP) has undertaken interdisciplinary research on different archaeological sites inside and around the Serra da Capivara National Park (Brazilian Northeast) (Fig 1). Nine archaeological stratigraphic sequences and more than fifty archaeological levels attest to an important human occupation between 40 and 5 kyr BP PLOS ONE [13,[16][17][18]. Ages were obtained both based on luminescence dating techniques (Single-grain or SG-OSL, and multi-grain or MG-OSL optically stimulated luminescence), and on radiocarbon measurements.…”

Section: Introductionmentioning

confidence: 99%

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24.0 kyr cal BP stone artefact from Vale da Pedra Furada, Piauí, Brazil: Techno-functional analysis

et al. 2021

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Current archaeological paradigm proposes that the first peopling of the Americas does not exceed the Last Glacial Maximum period. In this context, the acceptance of the anthropogenic character of the earliest stone artefacts generally rests on the presence of projectile points considered no more as typocentric but as typognomonic, since it allows, by itself, to certify the human character of the other associated artefacts. In other words, without this presence, nothing is certain. Archaeological research at Piauí (Brazil) attests to a Pleistocene human presence between 41 and 14 cal kyr BP, without any record of lithic projectile points. Here, we report the discovery and interpretation of an unusual stone artefact in the Vale da Pedra Furada site, in a context dating back to 24 cal kyr BP. The knapping stigmata and macroscopic use-wear traces reveal a conception centred on the configuration of double bevels and the production in the same specimen of at least two successive artefacts with probably different functions. This piece unambiguously presents an anthropic character and reveals a technical novelty during the Pleistocene occupation of South America.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

24.0 kyr cal BP stone artefact from Vale da Pedra Furada, Piauí, Brazil: Techno-functional analysis

et al. 2021

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“…To implement the Bayesian models of Combès et al (2015) and Combès and Philippe (2017) in practice, and provide easy access to the community, an R package (R Core Team, 2020) named "BayLum" (Christophe et al, 2020; version 0.2.0) has been developed and released on the Comprehensive R Archive Network (CRAN; see also Mercier et al, 2016, for a first implementation of the central-dose model developed by Combès et al, 2015). The first features of this BayLum package were presented by Philippe et al (2019), and its performance, when one is confronted either with large dose values or with dose variability issues, was tested in laboratory-controlled experiments (Heydari and Guérin, 2018) and later applied to various case studies (Lahaye et al, 2018;Carter et al, 2019;Heydari et al, 2020Heydari et al, , 2021Chevrier et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Towards an improvement of optically stimulated luminescence (OSL) age uncertainties: modelling OSL ages with systematic errors, stratigraphic constraints and radiocarbon ages using the R package BayLum

et al. 2021

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Abstract. Statistical analysis has become increasingly important in optically stimulated luminescence (OSL) dating since it has become possible to measure signals at the single-grain scale. The accuracy of large chronological datasets can benefit from the inclusion, in chronological modelling, of stratigraphic constraints and shared systematic errors. Recently, a number of Bayesian models have been developed for OSL age calculation; the R package “BayLum” presented herein allows different models of this type to be implemented, particularly for samples in stratigraphic order which share systematic errors. We first show how to introduce stratigraphic constraints in BayLum; then, we focus on the construction, based on measurement uncertainties, of dose covariance matrices to account for systematic errors specific to OSL dating. The nature (systematic versus random) of errors affecting OSL ages is discussed, based – as an example – on the dose rate determination procedure at the IRAMAT-CRP2A laboratory (Bordeaux). The effects of the stratigraphic constraints and dose covariance matrices are illustrated on example datasets. In particular, the benefit of combining the modelling of systematic errors with independent ages, unaffected by these errors, is demonstrated. Finally, we discuss other common ways of estimating dose rates and how they may be taken into account in the covariance matrix by other potential users and laboratories. Test datasets are provided as a Supplement to the reader, together with an R markdown tutorial allowing the reproduction of all calculations and figures presented in this study.

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“…The R (R Core Team, 2019) package 'BayLum' based on Combès et al (2015), Combès and Philippe (2017) and implemented by Philippe et al (2018) claims to play out the power of Bayesian methods by employing hierarchical Bayesian models to analyse OSL signals and estimate palaeodoses. Heydari and Guérin (2018) already showed in two laboratorycontrolled experiments that the Bayesian models result in most accurate estimations of the palaeodose when compared to conventional methods, and Lahaye et al (2019) reported the first application of it in a dating study. Beyond, a full-scale application of 'BayLum' in a large dating study under 'non-perfect' conditions is still uncharted territory raising the question of whether "these new Bayesian methods do lead to more precise chronologies" and it leads to the here presented threefold contribution:…”

Section: Introductionmentioning

confidence: 99%

Do Bayesian methods lead to more precise chronologies? ‘BayLum’ and a first OSL-based chronology for the Palaeolithic open-air site of Mirak (Iran)

Heydari

Guérin

Kreutzer

et al. 2020

Quaternary Geochronology

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Bayesian inference has been applied extensively to chronologies in archaeological science since it provides several advantages over the (classic) frequentist approach. One of the most important aspects of applying Bayesian methods is their capacity to consider the stratigraphic relationship in the final ages. More specifically, in luminescence dating, a crucial motivation for applying Bayesian modelling is the ability to address the systematic shared uncertainty. The recently deployed R package 'BayLum' was developed to ameliorate luminescence-based chronologies by employing Bayesian modelling. Our contribution aims at estimating the impact of stratigraphic order and systematic shared uncertainty on the age results. In this paper, for the first time, we present a comprehensive luminescence-based chronology for the Middle-Upper Palaeolithic site of Mirak. The open-air site is located in the northern fringes of the Iranian Central Desert, which is considered to be one of the dispersal corridors for hominins (Neanderthal and modern human) living across Western and Central Asia. We compare chronologies derived by frequentist and Bayesian methods to discuss the effect of stratigraphic order and addressing the correlation between samples due to systematic shared

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Another site, same old song: The Pleistocene-Holocene archaeological sequence of Toca da Janela da Barra do Antonião-North, Piauí, Brazil

Cited by 26 publications

References 36 publications

24.0 kyr cal BP stone artefact from Vale da Pedra Furada, Piauí, Brazil: Techno-functional analysis

24.0 kyr cal BP stone artefact from Vale da Pedra Furada, Piauí, Brazil: Techno-functional analysis

Towards an improvement of optically stimulated luminescence (OSL) age uncertainties: modelling OSL ages with systematic errors, stratigraphic constraints and radiocarbon ages using the R package BayLum

Do Bayesian methods lead to more precise chronologies? ‘BayLum’ and a first OSL-based chronology for the Palaeolithic open-air site of Mirak (Iran)

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