|Title||Quaternary geology of northeastern Alberta|
|Author||Bednarski, J M|
|Source||Geological Survey of Canada, Bulletin 535, 1999, 29 pages (5 sheets), https://doi.org/10.4095/210912 (Open Access)|
|Publisher||Natural Resources Canada|
|Maps||Publication contains 5 maps|
|Map Info.||surficial geology, landforms, lithological, 1:100,000|
|Media||paper; on-line; digital|
|Related||This publication contains the following
|NTS||74L/13; 74L/14; 74L/15; 74L/16; 74M|
|Area||Kazan Upland; Slave River; Lake Athabasca; Peace River; Fort Chipewyan; Fort Smith; Wood Buffalo National Park|
|Lat/Long WENS||-112.0000 -110.0000 60.0000 58.6667|
|Subjects||surficial geology/geomorphology; stratigraphy; ice sheets; glacial deposits; glaciation; glacial lakes; glacial history; glacial features; glacial lake deposits; glaciolacustrine deposits; glaciofluvial
deposits; glacial landforms; moraines; tills; erosion; deglaciation; stratigraphic analyses; eolian deposits; striations; ice movement directions; Wisconsinian glacial stage; aggregates; Laurentide Ice-sheet; Glacial Lake McConnell;
|Illustrations||sketch maps; aerial photographs; cross-sections; photographs|
|Program||Canada-Alberta Agreement on Mineral Development, 1992-1995|
|Released||1999 11 01; 2013 09 10|
|Abstract||The Kazan upland, the only surface exposure of Precambrian shield in Alberta, was extensively scoured by the Laurentide Ice Sheet during the last glaciation and is now sparsely covered by glacial
deposits. In contrast, areas underlain by Paleozoic sedimentary rocks west of the Slave River are covered by widespread glacial, deltaic, and lacustrine sediments.|
The ice sheet flowed southwestward over the area during the last glacial maximum,
but the pattern of ice flow changed during deglaciation when two distinct lobes developed. A westward-flowing ice lobe, occupying the Lake Athabasca basin, converged with southwesterly flowing ice north of it. The lateral contact between the two
lobes is marked by converging striae and a broad east-west band of glacial outwash and lake sediments.
As the ice sheet retreated eastward, the Slave River lowland and Lake Athabasca basin were flooded from the north by glacial Lake McConnell.
The ice sheet formed an extensive ice dam along the western edge of the Kazan upland and glacial Lake McConnell reached about 305 m a.s.l. near present-day Lake Athabasca. The Slave moraine marks the position of this ice front and is correlative with
the 10 ka BP Cree Lake moraine of northeastern Saskatchewan.
As glacial Lake McConnell drained, a large delta formed in the Slave River lowland depositing sand over the glaciolacustrine mud. The delta was at its largest when Lake Athabasca
separated from glacial Lake McConnell between 9 and 8 ka BP. Later, in the Holocene, the Peace and Slave rivers incised the older deltaic sediments, forming the modern Peace River-Athabasca River delta.