Found 103 datasets

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Aquatic community response in a groundwater-fed desert lake to Holocene desiccation of the Sahara doi Spatial

The finely laminated sediment record of a permanent, hypersaline, desert oasis lake in the Ounianga region of northeastern Chad presents a unique opportunity to document the hydrological evolution of this groundwater-fed aquatic ecosystem during mid- and late-Holocene desiccation of the Sahara. In this study we reconstruct long-term changes in zoobenthos and zooplankton communities of Lake Yoa as their early-Holocene freshwater habitat changed into the hypersaline conditions prevailing today. Chironomid...
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Optical dating of sediments in Wadi Sabra (SW Jordan) doi Spatial

At Wadi Sabra (SW Jordan) human occupation dates back to the Palaeolithic and Epipalaeolithic. Although there is stratigraphic correlation based on archaeological finds of Ahmarian origin, numerical age estimates are lacking. We applied single-aliquot optical dating of coarse grained quartz of wadi deposits and investigated the luminescence properties in detail to achieve more accurate age information about the time of human occupation. Weak luminescence signals and scattered dose distributions characterise...
Keywords: GQT1 LRQ1
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Quantification and spatial distribution of dose rate relevant elements in silex used for luminescence dating doi

Thermoluminescence (TL) is routinely used to date heated lithic artefacts which mostly consist of silex (a mixture of amorphous opal and microcrystalline chalcedony). Analytical investigations of bulk samples confirmed that these materials contain considerable concentrations of radioactive elements, generating an internal dose rate contribution. Common dosimetric models assume the latter to be homogeneous throughout the sample. If this assumption would prove invalid, this will result in systematic errors in...
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Assessment of radionuclide distribution in silex by autoradiography in the context of dose rate determination for thermoluminescence dating doi

A combination of two autoradiography methods was applied to investigate the radionuclide distribution patterns in a range of different silices. We obtained greyscale images (β-radiation) and α-track patterns for qualitative assessment, and used a statistical approach to quantify the degree of uniformity of the radiation fields. It was found that almost all samples are poor in potassium, thorium and uranium, and that locally high concentrations are present only in dark-coloured veins and inclusions....
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First chronometric dates (TL and OSL) for the Aurignacian open-air site of Româneşti-Dumbrăviţa I, Romania doi Spatial

Currently, absolute dates for the emergence of the Early Upper Paleolithic and the timing of the earliest dispersal of anatomically modern humans (AMH) into Europe are sparse. This is especially true for regions adjoining the Eastern Mediterranean and Central Europe with its dense clusters of sites along the Austrian and German Danube Valley. This article makes a first step toward filling this gap and, for the first time, presents absolute ages for the open-air site of Româneşti-Dumbrăviţa I (Banat, SW...
Keywords: LRQ1
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Pictures (Foto) Ifri el Baroud

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Human occupation of Northwest Africa: A review of Middle Palaeolithic to Epipalaeolithic sites in Morocco doi

This paper provides a summary of all available numerical ages from contexts of the Moroccan Middle Palaeolithic to Epipalaeolithic and reviews some of the most important sites. Particular attention is paid to the so-called “Aterian”, albeit those so-labeled assemblages fail to show any geographical and chronological pattern. For this reason, this phenomenon should not be considered a distinct culture or techno-complex and is referred to hereinafter as Middle Palaeolithic of Aterian type. Whereas anatomical...
Keywords: GQT1 LRQ1
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Neolithisation process within the Alboran territory: Models and possible African impact doi Spatial

The Neolithisation of the southern Iberian Peninsula and the Mediterranean Maghreb, here termed “Alboran territory”, must be considered as the same integrative process. By the mid-8th millennium calBP, both sides of the Western Mediterranean were inhabited by hunter-gatherer groups which probably maintained intercontinental contacts. However, from around 7.6 ka calBP, Neolithic groups from the Eastern Mediterranean arrived in the region along the littoral of what is today Andalusia. Neolithic innovations...
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Köppen-Geiger classifications of paleoclimate model simulations (Presentation)

The development and application of an algorithm to compute the Köppen-Geiger climate classification for CMIP/PMIP climate model data is described in this persentation. The classification algorithm is applied to data from the PMIP III paleoclimate experiments for the Last Glacial Maximum (21k yBP), Mid-Holocene (6k yBP) and the Pre-Industrial (0k yBP, control run) time slices. The input data was interpolated to infer higher resolution classification maps. The classification was implemented using Open Source...
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Mobilitätsmuster durch veränderte Subsistenzstrategien in einem 'agent-based model'

Wie läßt sich die Landschaftsnutzung von Jäger-Sammlern rekonstruieren? Ein Problem für die interdisziplinäre Arbeit ist, daß die ethnographische Forschung Belege über kurzfristige Auswirkungen von Entscheidungen liefert, Archäologen aber eher an der längerfristige Landschaftsnutzung von Jäger-Sammlern interessiert sind. Eine Lösungsmöglichkeit ist, ethnographisch informierte Handlungsstrategien mithilfe eines Simulationsmodells über einen längeren Zeitraum zu Mobilitätsmustern zusammenfassen.
Keywords: LRQ19 LRQ5
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Boni Island - Holozäne Landschaftsdynamik und Mensch-Umwelt-Beziehung am Vierten Nil-Katarakt (Nord-Sudan) Spatial

Der Vierte Nil-Katarakt im Nord-Sudan ist im Jahr 2008 im Hamdab-Stausee untergegangen. Geowissenschaftlich und archäologisch bislang kaum erforscht, stellte er eine einzigartige landschaftliche Versuchsanordnung dar. Am Beispiel der Insel Boni, die für die vorliegende Studie vor der Flutung im Rahmen des Sonderforschungsbereichs 389 untersucht wurde, wird gezeigt, dass die tektonisch angelegte Kleinkammerung des Reliefs und die nachfolgende, periodisch und saisonal stark wechselnde fluviale und äolische...
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Feasibility studies of terrestrial laser scanning in Coastal Geomorphology, Agronomy, and Geoarchaeology

Terrestrial laser scanning (TLS) is a newer, active method of remote sensing for the automatic detection of 3D coordinate points. This method has been developed particularly during the last 20 years, in addition to airborne and mobile laser scanning methods. All these methods use laser light and additional angle measurements for the detection of distances and directions. Thus, several thousands to hundreds of thousands of polar coordinates per second can be measured directly by an automatic deflection of...
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