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首页> 外文期刊>Geoarchaeology >Geoarchaeological and chronostratigraphical investigations of open-air sites in the Geelbek Dunes, South Africa
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Geoarchaeological and chronostratigraphical investigations of open-air sites in the Geelbek Dunes, South Africa

机译：南非吉尔贝克沙丘露天场地的地质考古和年代地层调查

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摘要

The Geelbek Dunes located north of Cape Town, South Africa, are an active, northward migrating dune field. Interdunal deflation hollows temporarily expose former land surfaces that are associated with archaeological sites. These open-air sites shed light on large-scale patterns of Middle and Later Stone Age settlement and augment the information gained from well-stratified, but spatially limited caves, rock shelters, and coastal shell middens. Based on paleopedological and sedimentological parameters, three former land surfaces were identified and associated with different assemblages. A chronostratigraphy of the various land surfaces was established by applying optically stimulated luminescence (OSL) dating. The youngest former land surface is represented by a dune generation (AD2) which stabilized at a maximum of 5 ka. An older dune generation (AD1) shows a more heterogeneous age pattern where deposition started at ca. 27 ka with a maximum estimated age of stabilization at ca. 10 ka. Both of these dune generations overlie a weathered calcrete complex of Middle to Late Pleistocene age. While the third dune generation (ADO) was observed between underlying calcrete layers, samples taken from this unit could not be dated. (C) 2008 Wiley Periodicals, Inc.
机译：南非开普敦北部的吉尔贝克沙丘是活跃的，向北迁移的沙丘场。 du间通缩空洞暂时暴露了与考古遗址相关的前陆面。这些露天场所揭示了石器时代中期和后期的大规模格局，并增强了从分层良好但空间有限的洞穴，岩石掩体和沿海贝壳中部获得的信息。根据古生物学和沉积学参数，确定了三个以前的陆地表面并与不同的组合相关联。通过应用光学激发发光（OSL）测年建立了各个陆面的年代地层。前最年轻的陆地表面以最大稳定在5 ka的沙丘生成（AD2）为代表。较早的沙丘时代（AD1）表现出更多样化的年龄模式，其中沉积始于约。最大估计稳定寿命为27 ka。 10 ka。这两个沙丘世代都覆盖在中更新世晚期的风化碎石复合体上。虽然在下层混凝土层之间观察到了第三代沙丘（ADO），但无法标出从该单元取样的日期。 （C）2008 Wiley期刊公司

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