Journal: The Holocene

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SAGE

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0959-6836
1477-0911

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Publications 1 - 10 of 43
  • Holocene paleoclimate of Southern Patagonia: limnological and environmental history of Lago Cardiel, Argentina
    Item type: Journal Article
    Markgraf, Vera; Bradbury, J. Platt; Schwalb, Antje; et al. (2003)
    The Holocene
  • Pollen and plant macrofossils at Lac de Fully (2135 m a.s.l.): Holocene forest dynamics on a highland plateau in the Valais, Switzerland
    Item type: Journal Article
    Finsinger, Walter; Tinner, Willy (2007)
    The Holocene
    We use pollen, stomata and plant-macrofossil records to infer Holocene timberline fluctuations and changes in forest composition at Lac Supérieur de Fully (2135 m a.s.l.), a small lake located near the modern regional timberline on a highland plateau in the Central Alps. Our records suggest that during the early Holocene vegetation was rather open on the plateau (eg, heaths of Dryas octopetala, Juniperus nana). The only tree that was able to build major stands was Betula. Other timberline trees (eg, Pinus cembra and Larix) expanded in the catchment of the lake after 8200 cal. BP, when Abies alba expanded at lower elevation. The late appearance of these timberline trees contrasts with previous plant-macrofossil records in the region, which show that the timberline had reached elevations up to at least 2350 m already at 11000 cal. BP. We suggest that local climatic conditions may have delayed the expansion of closed stands of coniferous trees in the catchment of Lac de Fully until c. 8200 cal. BP, when climate shifted to more humid and less continental conditions. After c . 4600 cal. BP vegetation around the lake primarily responded to human impact, which caused a local lowering of the timberline by at least 150 m.
  • Glaciar Leon, Chilean Patagonia: late-Holocene chronology and geomorphology
    Item type: Journal Article
    Harrison, Stephan; Glasser, Neil; Winchester, Vanessa; et al. (2008)
    The Holocene
  • An archaeobotanical and stable isotope approach to changing agricultural practices in the NW Mediterranean region around 4000 BC
    Item type: Journal Article
    Antolín, Ferran; Jacomet, Stefanie; Soteras, Raül; et al. (2024)
    The Holocene
    It has recently been observed, that a change in the crop spectrum happened during the so-called Middle Neolithic in France at ca. 4000 BC. An agricultural system based on free-threshing cereals (naked wheat and naked barley) seems to shift to one based on glume wheats. This is a major change for traditional farmers and this paper aims to shed light on its possible causes. Here we describe the results of new investigations in a key area for the understanding of this process: the NW Mediterranean arch, where free-threshing cereals are the main cultivars since ca. 5100 BC. New data confirm that the shift towards glume wheats is also observed in some sites of the NE of the Iberian Peninsula and that among the glume wheats that spread at ca. 4000 BC we should not only consider emmer and einkorn but also Timopheevi's wheat. Stable isotope analyses indicate no major decrease in soil fertility or alterations in local precipitation regimes. The agricultural change may be the result of a combination of the spread of damaging pests for free-threshing cereals and presumably new networks being developed with the North-eastern part of Italy and the Balkans.
  • Application of mid-infrared spectroscopy for the quantitative and qualitative analysis of organic matter in Holocene sediment records
    Item type: Journal Article
    Ninnes, Sofia; Meyer-Jacob, Carsten; Tolu, Julie; et al. (2024)
    The Holocene
    The organic matter composition of lake sediments influences important in-lake biogeochemical processes and stores information on environmental changes. Extracting this information is notoriously difficult because of the complexity of the organic matter matrix, which routinely imposes trade-offs between high temporal and analytical detail in the selection of methods of analysis. Here, we demonstrate the potential of diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS) for achieving both of these objectives using untreated bulk samples from two Holocene lake-sediment cores from central Sweden. We develop quantitative models for sediment total organic carbon (TOC) with the same predictive abilities as models based on samples diluted with KBr and qualitatively characterize the organic matter using a spectra processing-pipeline combined with principal component analysis. In the qualitative analysis we identified four organic matter sub-fractions and the interpretation of these is supported and further advanced with molecular data from pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). Within these organic fractions, compound groups such as aromatics, lignin, aliphatics, proteins and polysaccharides were identified by means of DRIFTS and the analyses and processes outlined here enables rapid and detailed quantitative and qualitative analysis of sediment organic matter. The DRIFTS approach can be used as stand-alone method for OM characterization with high temporal resolution in Holocene sediment records. It may also function as a screening process for more specific analyses of sample subsets, such as when coupled with pyrolysis-GC/MS to further tease apart the OM composition, identify sources and determine degradation status.
  • First dating of a rock painting in Ẓufār (Sultanate of Oman): Low energy plasma oxidation radiocarbon sampling
    Item type: Journal Article
    Rowe, Marvin W.; Le Quellec, Jean-Loïc; Jones, Shelby A.; et al. (2023)
    The Holocene
    We successfully measured four radiocarbon dates on two specimens of a black geometric rock painting with a fragment in jeopardy of naturally spalling off in the wall of a rock shelter in the Zufar region, in the south of the Sultanate of Oman. Extraction of carbon dioxide (CO2) for radiocarbon dating of the binder in the black pigment of the rock painting specimen was conducted in the plasma oxidation laboratory at the Office of Archeological Studies in Santa Fe, NM. The radiocarbon content was measured on the Swiss ETH-Zurich accelerator mass spectrometer MICADAS. The dates obtained agreed with one another within the statistical uncertainty and the average date of the four samples was 1500 +/- 35 radiocarbon years BP. The calendric equivalents of the average date results in calendric calibration date ranges that span the mid-fifth through mid-seventh centuries (440-453 CE, 478-496 CE, and 534-646 CE). This research demonstrates that it is possible to date the black paintings of the Jebel al-Qara' area of Oman; this is the first pictogram that was dated using radiocarbon dating in the region.
  • Pollen representation in surface samples of the Juniperus, Picea and Juglans forest belts of Kyrgyzstan, central Asia
    Item type: Journal Article
    Beer, Ruth; Tinner, Willy; Carraro, Gabriele; et al. (2007)
    The Holocene
  • Influence of sampling and disturbance history on climatic sensitivity of temperature-limited conifers
    Item type: Journal Article
    Rydval, Miloš; Druckenbrod, Daniel L.; Svoboda, Miroslav; et al. (2018)
    The Holocene
  • Neolithic to Bronze Age (4850–3450 cal. BP) fire management of the Alpine Lower Engadine landscape (Switzerland) to establish pastures and cereal fields
    Item type: Journal Article
    Dietre, Benjamin; Walser, Christoph; Kofler, Werner; et al. (2017)
    The Holocene
  • Redating the moraines in the Kromer Valley (Silvretta Mountains): New evidence for an early Holocene glacier advance
    Item type: Journal Article
    Moran, Andrew P.; Kerschner, Hanns; Ivy-Ochs, Susan (2015)
    The Holocene
Publications 1 - 10 of 43