pleistocene glaciation
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CATENA ◽  
2022 ◽  
Vol 210 ◽  
pp. 105873
Author(s):  
Piotr Kłapyta ◽  
Marcel Mîndrescu ◽  
Jerzy Zasadni

Author(s):  
Felix Martin Hofmann ◽  
Frank Preusser ◽  
Irene Schimmelpfennig ◽  
Laëtitia Léanni ◽  
Aster team (Georges Aumaître, Karim Keddadouche & Fawzi Zaid

Author(s):  
Corinne Y. Griffing ◽  
John J. Clague ◽  
Rene W. Barendregt ◽  
Bettina Ercolano ◽  
Hugo Corbella ◽  
...  

Author(s):  
I. D. Zolnikov ◽  
◽  
A. A. Anoykin ◽  
A. V. Postnov ◽  
A. V. Vybornov ◽  
...  

The Upper Neo-Pleistocene alluvial deposits lie in a close hypsometric position in outcrops of the Lower Ob Region right bank. Their top usually does not rise above the level of 5 m above the tow-path edge. At the same level, glacial erratic masses of the Middle Pleistocene alluvium were recorded in a number of areas. The height of the 1st and 2nd sites of terraces (on average from 5 to 10–15 m) depends on the thickness of subaerial deposits overlapping the alluvium. The 3rd terrace above flood-plain of the Bolshaya (Big) Ob has no geomorphological expression, since the alluvium of the first Late Neo-Pleistocene interglacial period without ablation is drape overlain by parallely bedded precipitates of the glacier-ice-blocked lake of the first Late Neo-Pleistocene glaciation. Thus, the height of sites of terraced surfaces does not directly correlate with the age of their alluvial basement. Therefore, the geomorphological method for differentiation of river sediments is not effective for this region. In addition, the problems of differentiation and correlation of alluvial deposits of the Lower Ob Region right bank are complicated by the presence of fluvioglacial incisions of deglaciation stages of the Middle Neo-Pleistocene and Upper Neo-Pleistocene glaciations.


Climate ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 162
Author(s):  
Anna Agatova ◽  
Roman Nepop ◽  
Andrey Nazarov ◽  
Ivan Ovchinnikov ◽  
Piotr Moska

Analysis of new chronological data, including 55 radiocarbon, 1 OSL, and 8 dendrochronological dates, obtained in the upper reaches of trough valleys within the Katun, North Chuya, South Chuya, and Chikhachev ranges, together with the 55 previously published ones, specifies climatically driven glacier dynamic in the Russian Altai. Available data refute the traditional concept of the Russian Altai Holocene glaciations as a consecutive retreat of the Late Pleistocene glaciation. Considerable and prolonged warming in the Early Holocene started no later than 11.3–11.4 cal kBP. It caused significant shrinking or even complete degradation of alpine glaciers and regeneration of forest vegetation 300–400 m above the modern upper timber limit. Stadial advances occurred in the middle of the Holocene (4.9–4.2 cal kBP), during the Historical (2.3–1.7 cal kBP), and the Aktru (LIA thirteenth–nineteenth century) stages. New radiocarbon ages of fossil soils limited glaciers expansion in the Middle Holocene by the size of the Historical moraine. Lesser glacial activity between 5 and 4 cal kBP is also supported by rapid reforestation in the heads of trough valleys. Glaciers advance within the Russian Altai, accompanied by accumulation of the Akkem moraine, could have occurred at the end of the Late Pleistocene.


2021 ◽  
Vol 270 ◽  
pp. 107176
Author(s):  
Wenshen Xiao ◽  
Leonid Polyak ◽  
Rujian Wang ◽  
Christelle Not ◽  
Linsen Dong ◽  
...  

2021 ◽  
pp. pygs2020-019
Author(s):  
William A. Fairburn ◽  
Mark D. Bateman

Whilst the Late Devensian glaciation (MIS2) of the Vale of Pickering is well-documented, earlier glaciations within it are not. A proposed limited glaciation in the Mid-Pleistocene, thought to be of Marine Isotope Stage 8 (MIS) age is not well constrained. This paper aimed to obtain preliminary ages for two of the most prominent geomorphic features in the Vale of Pickering to see if they related to pre-Devensian glaciations. New luminescence dating by infra-red stimulation of feldspars from sand accumulations near the summit of Gallows Hill, part of the Wykeham Moraine, and from a section through poorly sorted fluvial sand and gravel on the flanks of the Hutton Buscel Terrace in Yedman Dale gave ages of 176±14 ka and 156±12 ka respectively. Evidence suggests they represent a glacial incursion (MIS 6) into the Vale of Pickering blocking its eastern end and forming a pre-Devensian Glacial Lake Pickering. Whilst they could be older, this style of glaciation is very different to the limited plateau ice-field proposed for MIS 8 at the western end of the Vale of Pickering. Taken at face value, these preliminary ages suggest that the Vale of Pickering was partially glaciated in MIS 6 as part of a wider ice-sheet and contemporary with the Saalian glaciation in Europe.


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