scholarly journals Quaternary Geology of Upper Coppermine River Valley, District of Mackenzie

1982 ◽  
Author(s):  
D A St-Onge ◽  
F Guay
Keyword(s):  
River Valley ◽  
Quaternary Geology ◽  
Coppermine River

The late Wisconsinan olistostrome of the lower Coppermine River valley, Northwest Territories

1986 ◽  
Vol 23 (11) ◽  
pp. 1700-1708 ◽  
Author(s):  
Denis A. St-Onge ◽  
Jean Lajoie
Keyword(s):  
Debris Flows ◽  
Late Quaternary ◽  
Fine Sand ◽  
Coarse Sand ◽  
Coarse Fraction ◽  
River Valley ◽  
Glacial Lake ◽  
The North ◽  
Geologic Record ◽  
Coppermine River

The late Quaternary olistostrome exposed in the lower Coppermine River valley fills a paleovalley that ranges in apparent width from 150 to 400 m and was cut into Precambrian bedrock before the last glaciation. The olistostrome is here named the Sleigh Creek Formation. The coarse fraction of the formation is matrix supported; beds are massive or reversely graded and have sharp, nonerosive contacts. These characteristics suggest deposition of the coarse fraction by debris flows. The olistostrome sequence is bracketed by, and wedged into, a marine rhythmite sequence, which indicates that deposition occurred in a marine environment.About 10 500 years BP glacier ice in the Coronation Gulf lowland dammed the valley to the south, which was occupied by glacial Lake Coppermine. Sediments accumulated in this lake in a 30 m thick, coarsening upward sequence ranging from glaciolacustrine rhythmites of silt and fine sand at the base to coarse sand alluvium, and deltaic gravels at the top. As the Coronation Gulf lowlands became ice free, the Coppermine River reoccupied its former drainage course to the north. The steep south to north gradient and rapid downcutting by the river through the glacial lake sediments produced unstable slope conditions. The resulting debris flows filled a bedrock valley network below the postglacial sea level, forming the diamicton sequence.The interpretation of the Sleigh Creek Formation raises questions concerning silimar diamicton deposits usually defined as "flowtills." More generally, the results of this study indicate that care must be used when attempting paleogeographic reconstructions of "glaciogenic" deposits in marine sequences in any part of the geologic record.

Testing the perspectives for discovery of the Paleolithic sites in the northern portion of the Ob river valley: Quaternary geology, paleogeography, and geomorphology

2019 ◽  
Vol 17 ◽  
pp. 109-116
Author(s):  
Ivan D. Zolnikov ◽  
Anton V. Vybornov ◽  
Alexander V. Postnov ◽  
Andrey G. Rybalko ◽  
Andrei A. Kartoziia
Keyword(s):  
River Valley ◽  
Quaternary Geology ◽  
Ob River ◽  
Northern Portion

scholarly journals The Initial Period of the Investigation of the Relief and Landscape of the Oka River Valley (the 19th Century — the 1940s)

2021 ◽  
pp. 130-139
Author(s):  
А.Ю. Воробьев
Keyword(s):  
19Th Century ◽  
Initial Period ◽  
River Valley ◽  
Quaternary Geology ◽  
Moscow Region ◽  
The South ◽  
River Terraces ◽  
Vladimir Region ◽  
The 19Th Century

Рассматриваются изданные с середины XIX века до 1940-х годов работы, посвященные физико-географическим исследованиям в пределах долины средней Оки в Рязанской области, юго-востока Московской области и юга Владимирской области. Отмечен повышенный интерес к вопросам четвертичной геологии и распределения высот в террасовом комплексе долины. Выделены достижения в области разработки вопросов типизации археологических памятников и геоморфологического районирования. Обозначены тенденции, существовавшие в распределении акцентов в физико-географических исследованиях региона за период с середины XIX века по 40-е годы ХХ столетия. Определены главные методологические черты исследовательской работы, осуществлявшейся ведущими и региональными научными физико-географическими школами в обозначенный период и предметом которой были современное состояние долинных геокомплексов средней Оки и их облик в древности. The article treats research works published in the period between the mid 19th century and the 1940s and devoted to the investigation of the Oka river valley in the Ryazan region, the southeast of the Moscow region and the south of the Vladimir region. The article underlines that the issues of quaternary geology and architecture of river terraces have been investigated by many researchers. The article analyzes works devoted to the classification of archeological and geomorphological structures. It investigates tendencies associated with geographic research of the region during the mid 19th century – the 1940s. It identifies major methodological characteristics of the research of the architecture of the Oka river valley performed by leading and local geographic societies.

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