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      Western visitors at the Blätterhöhle (city of Hagen, southern Westphalia) during the Younger Dryas? A new final palaeolithic assemblage type in western Germany

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          Abstract

          Until now, it was considered certain that the last reindeer hunters of the Ahrensburgian (tanged point groups) existed exclusively in northwestern Central Europe during the Younger Dryas Cold Period (~ Greenland Stadial 1). The excavations carried out since 2006 on the forecourt ( Vorplatz) of the small Blätterhöhle in Hagen on the northern edge of the Sauerland uplands of southern Westphalia (North Rhine-Westphalia, western Germany) have now changed this view. Beneath a surprisingly extensive sequence of Mesolithic find horizons, Pleistocene sediments could be reached whose excavations yielded a Final Palaeolithic lithic ensemble of the Younger Dryas, unusual for the region and beyond. It is characterised by numerous backed lithic projectile points of high variability. Comparisons suggest a typological-technological connection with the Western European Laborian / Late Laborian. Neither in the nearer nor in the wider surroundings has a comparable lithic find ensemble been found so far. In addition, there is a lack of clear evidence for the reindeer in the fauna. Surprisingly, the vast majority of radiocarbon dates of bones and charcoals from the investigated archaeological horizon of the Final Pleistocene proved to be significantly older than expected from their stratigraphic position. This phenomenon has not yet been clarified.

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          THE INTCAL20 NORTHERN HEMISPHERE RADIOCARBON AGE CALIBRATION CURVE (0–55 CAL kBP)

          Radiocarbon ( 14 C) ages cannot provide absolutely dated chronologies for archaeological or paleoenvironmental studies directly but must be converted to calendar age equivalents using a calibration curve compensating for fluctuations in atmospheric 14 C concentration. Although calibration curves are constructed from independently dated archives, they invariably require revision as new data become available and our understanding of the Earth system improves. In this volume the international 14 C calibration curves for both the Northern and Southern Hemispheres, as well as for the ocean surface layer, have been updated to include a wealth of new data and extended to 55,000 cal BP. Based on tree rings, IntCal20 now extends as a fully atmospheric record to ca. 13,900 cal BP. For the older part of the timescale, IntCal20 comprises statistically integrated evidence from floating tree-ring chronologies, lacustrine and marine sediments, speleothems, and corals. We utilized improved evaluation of the timescales and location variable 14 C offsets from the atmosphere (reservoir age, dead carbon fraction) for each dataset. New statistical methods have refined the structure of the calibration curves while maintaining a robust treatment of uncertainties in the 14 C ages, the calendar ages and other corrections. The inclusion of modeled marine reservoir ages derived from a three-dimensional ocean circulation model has allowed us to apply more appropriate reservoir corrections to the marine 14 C data rather than the previous use of constant regional offsets from the atmosphere. Here we provide an overview of the new and revised datasets and the associated methods used for the construction of the IntCal20 curve and explore potential regional offsets for tree-ring data. We discuss the main differences with respect to the previous calibration curve, IntCal13, and some of the implications for archaeology and geosciences ranging from the recent past to the time of the extinction of the Neanderthals.
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            A stratigraphic framework for abrupt climatic changes during the Last Glacial period based on three synchronized Greenland ice-core records: refining and extending the INTIMATE event stratigraphy

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              Brief communication: The London atlas of human tooth development and eruption.

              The aim of this study was to develop a comprehensive evidence-based atlas to estimate age using both tooth development and alveolar eruption for human individuals between 28 weeks in utero and 23 years. This was a cross-sectional, retrospective study of archived material with the sample aged 2 years and older having a uniform age and sex distribution. Developing teeth from 72 prenatal and 104 postnatal skeletal remains of known age-at-death were examined from collections held at the Royal College of Surgeons of England and the Natural History Museum, London, UK (M 91, F 72, unknown sex 13). Data were also collected from dental radiographs of living individuals (M 264, F 264). Median stage for tooth development and eruption for all age categories was used to construct the atlas. Tooth development was determined according to Moorrees et al. (J Dent Res 42 (1963a) 490-502; Am J Phys Anthropol 21 (1963b) 205-213) and eruption was assessed relative to the alveolar bone level. Intraexaminer reproducibility calculated using Kappa on 150 teeth was 0.90 for 15 skeletal remains of age <2 years, and 0.81 from 605 teeth (50 radiographs). Age categories were monthly in the last trimester, 2 weeks perinatally, 3-month intervals during the first year, and at every year thereafter. Results show that tooth formation is least variable in infancy and most variable after the age of 16 years for the development of the third molar. (c) 2010 Wiley-Liss, Inc.
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                Author and article information

                Contributors
                Role: ConceptualizationRole: Data curationRole: Funding acquisitionRole: InvestigationRole: MethodologyRole: Project administrationRole: ResourcesRole: SupervisionRole: ValidationRole: VisualizationRole: Writing – original draftRole: Writing – review & editing
                Role: ConceptualizationRole: Data curationRole: Funding acquisitionRole: InvestigationRole: MethodologyRole: Project administrationRole: ResourcesRole: SupervisionRole: ValidationRole: VisualizationRole: Writing – original draftRole: Writing – review & editing
                Role: Data curationRole: InvestigationRole: MethodologyRole: ResourcesRole: ValidationRole: VisualizationRole: Writing – original draftRole: Writing – review & editing
                Role: Formal analysisRole: InvestigationRole: MethodologyRole: VisualizationRole: Writing – original draft
                Role: Data curationRole: InvestigationRole: Writing – original draft
                Role: InvestigationRole: MethodologyRole: VisualizationRole: Writing – original draft
                Role: Data curationRole: Writing – original draft
                Role: ConceptualizationRole: Data curationRole: Funding acquisitionRole: InvestigationRole: MethodologyRole: Project administrationRole: ResourcesRole: SoftwareRole: SupervisionRole: ValidationRole: VisualizationRole: Writing – original draftRole: Writing – review & editing
                Role: Editor
                Journal
                PLoS One
                PLoS One
                plos
                PLOS ONE
                Public Library of Science (San Francisco, CA USA )
                1932-6203
                3 May 2023
                2023
                : 18
                : 5
                : e0284479
                Affiliations
                [1 ] Department Olpe, LWL-Archaeology for Westphalia (State Office for Archaeology Westphalia), Olpe, Germany
                [2 ] Institute of Pre- and Protohistory, Department of Archaeological Sciences, Ruhr-University Bochum, Bochum, Germany
                [3 ] City Office for Preservation of Monuments and Archaeology, Hagen, Germany
                [4 ] Institute of Geography, University of Cologne, Cologne, Germany
                [5 ] Institute of Pre- and Protohistory, University of Cologne, Cologne, Germany
                [6 ] MObiles LAndschaftsMUseum, Office for Landscape- and Palaeo-Ecology, Waldbrunn, Germany
                [7 ] State Office for Preservation of Monuments and Archaeology Saxony-Anhalt, Halle (Saale), Germany
                [8 ] Institute of Prehistoric Archaeology, Department of History and Cultural Studies, Freie Universität Berlin, Berlin, Germany
                Universita degli Studi di Ferrara, ITALY
                Author notes

                Competing Interests: The authors declare that there are no existing competing interests.

                ‡ MK, AM, NN, DR and HR also contributed equally to this work.

                Author information
                https://orcid.org/0000-0001-9049-075X
                https://orcid.org/0000-0003-3629-8251
                Article
                PONE-D-22-21491
                10.1371/journal.pone.0284479
                10156063
                37134047
                b988bc42-4fd5-4a53-a567-e70ad70f7d27
                © 2023 Baales et al

                This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

                History
                : 26 October 2022
                : 31 March 2023
                Page count
                Figures: 29, Tables: 3, Pages: 55
                Funding
                Funded by: Government of Northrine-Westphalia (Dusseldorf) through the Monument Promotion programme
                Award Recipient :
                Funded by: City of Hagen
                Award Recipient :
                Funded by: ENERVIE-Group (Mark-E)
                Award Recipient :
                This work has in general been funded by the Government of Northrine-Westphalia (Dusseldorf) through the Monument Promotion programme to the LWL-Archaeology of Westphalia; further general funding was received by the city of Hagen; Mark-E (Enervie-Group) in Hagen by enabled the mollusc analyses by HR (no specific grant number etc. available). The funders had no role in the study design, data collection and analysis, the decision to publish, or in the preparation of the manuscript.
                Categories
                Research Article
                Earth Sciences
                Geology
                Petrology
                Sediment
                Earth Sciences
                Geology
                Sedimentary Geology
                Sediment
                Social Sciences
                Archaeology
                Social Sciences
                Archaeology
                Archaeological Dating
                Radioactive Carbon Dating
                Research and Analysis Methods
                Chemical Characterization
                Isotope Analysis
                Radioactive Carbon Dating
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                Archaeological Dating
                Earth Sciences
                Geology
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                Cenozoic Era
                Quaternary Period
                Pleistocene Epoch
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                Biology and Life Sciences
                Physical Anthropology
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                Mesolithic Period
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