| Titre | Landscapes and landforms of the Hudson Bay Lowlands
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| Auteur | Dredge, L A; Dyke, L D |
| Source | Landscapes and landforms of eastern Canada; par Slaymaker, O (éd.); Catto, N (éd.); World Geomorphological Landscapes 2020 p. 211-227, https://doi.org/10.1007/2F978-3-030-35137-3 8 |
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| Année | 2020 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20190607 |
| Éditeur | Springer |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1007/2F978-3-030-35137-3 8 |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Province | Ontario; Manitoba; Québec |
| SNRC | 32E; 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 |
| Région | Baie d'Hudson; Baie James; Polar Bear Provincial Park; Wapusk National Park; Moosonee; Churchill |
| Lat/Long OENS | -97.0000 -78.0000 59.0000 49.0000 |
| Sujets | types de paysage; topographie; terres humides; tourbières aligotrophes; tourbières; tourbières minérotrophes; marais; marais; wadden; eaux de surface; topographie; pénéplaines; antécédents géologiques;
antecedents glaciaires; glaciation; écoulement glaciaire; déglaciation; retrait de la glace; marges glaciaires; lacs proglaciaires; submersion; emersion; changements du niveau de la mer; géologie du substratum rocheux; climat; pergélisol; glace
fossile; caractéristiques périglaciaires; végétation; dépôts postglaciaires; sédiments marins; argiles; dépôts glaciaires; tills; sols; topographie glaciaire; sensitivité de terrain; Basses-Terres de la Baie d'Hudson; Calotte glaciaire de Keewatin ;
Calotte glaciaire de Labrador ; Lac glaciaire d'Agassiz; Lac glaciaire de Barlow-Ojibway; Calotte glaciaire Hudsonienne; Forêt; submersion, marine; sédiments glaciolacustres; géologie des dépôts meubles/géomorphologie; pédologie; géologie de
l'environnement; géologie régional; Nature et environnement; Phanérozoïque; Cénozoïque; Quaternaire; Paléozoïque; Précambrien |
| Illustrations | cartes de localisation; photographies aériennes; croquis cartographiques; photographies |
| Diffusé | 2020 02 14 |
| Résumé | (disponible en anglais seulement)
The 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. |
| GEOSCAN ID | 322171 |
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