GEOSCAN Search Results: Fastlink


TitleLandscapes and landforms of the Hudson Bay Lowlands
AuthorDredge, L A; Dyke, L D
SourceLandscapes and landforms of eastern Canada; by Slaymaker, O (ed.); Catto, N (ed.); World Geomorphological Landscapes 2020 p. 211-227, 8
Alt SeriesNatural Resources Canada, Contribution Series 20190607
Mediapaper; on-line; digital
File formatpdf
ProvinceOntario; Manitoba; Quebec
NTS32E; 32L; 32M; 42F; 42G; 42H; 42I; 42J; 42K; 42N; 42O; 42P; 43; 44D; 53A; 53G; 53H; 53I; 53J; 53K; 53L; 53M; 53N; 53O; 53P; 54A; 54B; 54C; 54D; 54E; 54F; 54G; 54K; 54L; 64A; 64H; 64I
AreaHudson Bay; James Bay; Polar Bear Provincial Park; Wapusk National Park; Moosonee; Churchill
Lat/Long WENS -97.0000 -78.0000 59.0000 49.0000
Subjectssurficial geology/geomorphology; soils science; environmental geology; regional geology; Nature and Environment; landscape types; landforms; wetlands; bogs; peatlands; fens; swamps; marshes; tidal flats; surface waters; topography; peneplains; geological history; glacial history; glaciation; ice flow; deglaciation; ice retreat; ice margins; proglacial lakes; submergence; emergence; sea level changes; bedrock geology; climate; permafrost; ground ice; periglacial features; vegetation; postglacial deposits; marine sediments; clays; glacial deposits; tills; soils; glacial landforms; terrain sensitivity; Hudson Bay Lowlands; Keewatin Ice Sheet; Labrador Ice Sheet; Glacial Lake Agassiz; Glacial Lake Barlow-Ojibway; Hudsonian Ice Sheet; Tyrrell Sea; Forests; submergence, marine; glaciolacustrine sediments; Phanerozoic; Cenozoic; Quaternary; Paleozoic; Precambrian
Illustrationslocation maps; aerial photographs; sketch maps; photographs
Released2020 02 14
AbstractThe Hudson Bay Lowlands and adjacent terrain form a vast wetland landscape with low relief and an abundance of organic terrain. Wetland landforms are the main features in the landscape. These include open and forested bogs and peat plateaus; flat fen meadows, and stringed and palsa fens; and swamps, marsh, and open water. Local relief is commonly <2 m. The landscape of the lowlands is the product of its geologic history and present conditions. The area is underlain by Precambrian and Palaeozoic rocks that were peneplaned to a gradient of <2 m/km. During the last glaciation, most of the area was covered by ice flowing out of, or across, the Palaeozoic limestone underlying and adjacent to Hudson Bay, although the western and eastern extremities of the lowlands were influenced, respectively, by Keewatin and Labradorean ice, both of shield provenance. Proglacial lakes Agassiz and Barlow-Ojibway followed the retreating ice sheet northward, deeply inundating the region. The southern margin of the Hudson ice sheet was unstable, and surged into the proglacial lakes. Following the break-up of Hudson ice about 8000 years ago, the lowlands were covered by a high postglacial sea (Tyrrell Sea), which regressed down to present sea level.
Summary(Plain Language Summary, not published)
This publication explores the fascinating landscape of the Hudson Bay Lowlands, a vast wetland area with low, flat terrain in Canada. The researchers aimed to understand the geological history and characteristics of this region, known for its wetlands, bogs, and meadows.
They discovered that the area's low relief, or flatness, is influenced by its geological past. The land here is made up of ancient rocks, and during the last ice age, much of it was covered by glaciers. As these glaciers melted and retreated, they formed large proglacial lakes, including Lakes Agassiz and Barlow-Ojibway, which once flooded the region.
After the glaciers disappeared around 8,000 years ago, the Hudson Bay Lowlands were covered by a vast post-glacial sea known as the Tyrrell Sea, which eventually receded to the present sea level.
The scientific impact of this research lies in understanding how the Earth's past geological processes have shaped the landscapes we see today. It sheds light on the history of this unique wetland area and provides valuable insights into how it has evolved over thousands of years. This knowledge can help us better manage and protect such environmentally important regions.

Date modified: