Paleoenvironments from robust loess stratigraphy using high-resolution color and grain-size data of the last glacial Krems-Wachtberg record (NE Austria)

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The Gravettian site Krems‐Wachtberg in northeast Austria produced a wealth of archaeological and sedimentary data. Precondition for a detailed study of the formation processes is co‐occurrence of find layers with in situ and redeposited material. We use archaeological data and sediment parameters to review and refine a formation model that was based solely on field observations. The archaeological perspective relies upon the rich chipped stone assemblage where each artefact is attributed with 3D position, orientation, stratigraphy, typo‐technological description, and raw material determination. This enabled systematic refitting and 3D analyses of the results. High‐resolution sampling of the sediment sequence which was conducted in six columns at different locations of the excavated area provided comparable results for grain size, colour and carbonate content. The study illustrates the complementary benefits of field observations, archaeological data and sediment parameters. While detailed loess stratigraphy creates the frame for understanding palaeoenvironmental processes, archaeological data enhances visibility of local post‐occupational sedimentary processes. This allows the archaeological sequence to be placed into a cycle of gradual de‐ and restabilisation of the palaeosurface. Burial of the ~31k cal abp occupation layer occurred by solifluction, slope wash and aeolian deposition between two stable phases marked by tundra gley soils.

Section: Study Layoutmentioning

confidence: 89%

Section: Methodsmentioning

confidence: 97%

“…Middle part of the composite profile published as KW 2015 by Sprafke et al . (2020). C: profile G96/97‐north with columns A–D (mid‐slope).…”

Section: Methodsmentioning

confidence: 99%

Section: Study Layoutmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Using archaeological data and sediment parameters to review the formation of the Gravettian layers at Krems‐Wachtberg

Händel

Thomas

Sprafke

et al. 2021

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Sedimentology of a Late Quaternary lacustrine record from the south‐eastern Carpathian Basin

Zeeden

Hambach

Klasen

et al. 2021

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The Upper Pleistocene geoarchives in the south-eastern Carpathian Basin are represented predominantly by loess-palaeosol records. In 2015, a 10 m sediment core composed of clay-rich lacustrine sediments was recovered by vibracoring a dry lake basin located between the Vršac Mountains (Serbia) and the Banat Sands in the south-eastern Carpathian Basin; a location relevant for placing regional archaeological results in a palaeoenvironmental context. Here, we present results from geoelectrical prospection and a lithostratigraphic interpretation of this sequence supported by a detailed granulometric study supplemented by ostracod analysis. An age model based on luminescence dating is discussed against sedimentological proxy data and its implication for palaeoenvironmental change. The cores show a stratigraphy of lighter ochre-coloured and darker greyish sediment, related to the deposition of clay and silt trapped in an aquatic environment. Geophysical measurements show ~20 m thick lacustrine sediments. The grain-size distributions including the variability in fine clay are indicative of a lacustrine environment. Fine particles were brought into the depositional environments by aquatic input and settled from suspension; also, direct dust input is constrained by grain-size results. Riverine input and aeolian dust input interplayed at the locality.

Intra‐interstadial environmental changes in Last Glacial loess revealed by molluscan assemblages from the Upper Palaeolithic site of Amiens‐Renancourt 1 (Somme, France)

Moine

Antoine

Coutard

et al. 2021

The Amiens-Renancourt 1 site recently yielded one of the most important Upper Palaeolithic human occupations of northern France by the number of flint artefacts and especially by the presence of Venus figurines. All the material comes from a single archaeological layer located in a tundra gley bracketed by loess units. A multi-proxy study combining a detailed stratigraphy, luminescence and radiocarbon datings and high-resolution (5 cm per sample) grain size and molluscan analyses was therefore carried out to reconstruct and date the associated environmental changes and to determine the exact context of the human occupation. The chronological frame thus established supports the correlations of the archaeology-bearing tundra gley and of an underlying arctic brown soil with Greenland interstadials GI-4 and GI-3. Composition changes in the molluscan population enabled the identification of transitional and optimum phases and sub-phases within these two pedogenetic horizons. A conceptual correlation model linking molluscan phases with millennial-scale variations of Greenland ice-core and Sieben Hengste speleothem climate records is proposed. The Human occupation appears contemporaneous to the end of the stadial-interstadial transition of GI-3. Synchronous in Amiens-Renancourt 1 and Nussloch, subsequent micro-gleys may also result from a regional/global forcing. Such a level of detail is unprecedented in a loess sequence.