![etka 7.5 tekkno etka 7.5 tekkno](https://clevertesting271.weebly.com/uploads/1/2/5/4/125489602/594383951.jpg)
Early podzolisation was followed by a short phase of local drift-sand deposition, at c. The onset of podzolisation and development of ericaceous vegetation occurred prior to the introduction of Neolithic farming, which is earlier than previously assumed. BP, implying a delayed response to Younger Dryas cooling, vegetation cover decline and river pattern change of the Scheldt. Regional aeolian deposition in source-bordering (river) dunes (Younger Coversand II) took place in the second part of the Younger Dryas, after 12.3 ka cal.
![etka 7.5 tekkno etka 7.5 tekkno](https://live.staticflickr.com/5657/23854718251_f93016db76_b.jpg)
This study reveals more phases than previously known of landscape stability (Usselo Soil and two podzol soils) and instability (Younger Coversand I and II, two drift-sand units) that are related to Late Weichselian climate change and Holocene human occupation. It is argued that the peaty top of wet-type podzols can be used for reliable radiocarbon dating. The dating results of soils and sediments are compatible, and no large hiatuses between the radiocarbon-dated top of the soils and OSL-dated overlying sands were observed. An integrated sedimentological (sedimentary structures, grain size), palynological (pollen) and dating approach (radiocarbon, optically stimulated luminescence (OSL)) was applied to unravel climatic and human forcing factors. Drift-sand deposition, probably related to human land use and vegetation decline, occurred in a 200-year period from the 16th to the 18th centuries.Ī stacked aeolian sequence with intercalated soils is presented from the southern Netherlands, which fully covers the Late Weichselian and Holocene periods.
![etka 7.5 tekkno etka 7.5 tekkno](https://pic.mysku-st.ru/uploads/pictures/00/64/65/2019/07/31/c1a383.jpg)
Landscape stability and podzol soil formation dominated the early and middle Holocene periods. The lithostratigraphic position, radiocarbon dates of the underlying Usselo Soil and a possibly old-wood effect of up to 200 years suggest that Ahrensburg occupation of the dune environment occurred during the early Younger Dryas, shortly after c. An Ahrensburg site in the upper part of this initial soil was dated at 10,915☓5 BP ( c. In the fine-grained lower part of the YCII unit an initial soil testifies to a decadal to centennial period of landscape stability. During the Younger Dryas, low aeolian dunes were formed locally (YCII), as a response to landscape instability due to cooling and vegetation decline. The well-developed Usselo Soil was formed during a phase of landscape stability during the late Allerød interstadial and onset of the Younger Dryas stadial. The upper part of the YCI unit was dated to the early Late Glacial. Fourteen optically stimulated luminescence dates on quartz and three radiocarbon dates provide the age control of the aeolian deposition (coversands, drift sand), landscape stability (soils) and human occupation. The exposure revealed a stacked sequence of aeolian sand units and intercalated soils (Older Coversand II, Younger Coversand I (YCI), Usselo Soil, Younger Coversand II (YCII), Holocene podzol, drift sand). The lithostratigraphy, age and human occupation of the Late Glacial and Holocene aeolian succession of a Late Palaeolithic Ahrensburg site in the excavation Geldrop-A2 (municipality of Heeze-Leende) have been investigated.