Everything about Laurentian Highlands totally explained
The
Laurentian Upland (or
Laurentian Highlands) is a
physiographic province which, when referred to as the "Laurentian Region," is recognized by
Natural Resources Canada as one of five provinces of the larger
Canadian Shield physiographic division. The
United States Geological Survey recognizes the Laurentian Upland as the larger general upland area of the Canadian Shield.
Geography
The Laurentian Region, as recognized by Natural Resources Canada, is part of the
plateau and dissected southern rim of the Canadian Shield in the province of
Québec. It is a western extension of the
Laurentian Mountains, and continues across the
Ottawa Valley into Ontario as the
Opeongo Hills. Viewed from the
valleys of the
Ottawa and
St. Lawrence Rivers, the south-facing escarpments of the Shield give the appearance of mountains 500-800
meters high; looking across the plateau, the relief is more moderate and subdued. These scarps mark the dramatic southern edge of this Upland region, of which
Mont Tremblant is the highest peak at roughly 875 meters.
Although the other limits are less well defined, this Laurentian Region in Quebec may be considered to extend 100-200 km northward from the
scarps and to stretch from the
Gatineau River in the west (mean elevation 400 m) some 550 km to the
Saguenay River in the northeast. Here it attains its maximum elevation north of
Quebec City in the
Réserve faunique des Laurentides (over 1000 m). Individual summits rise above the plateau surface:
Mont Sir Wilfrid (783 m) and Mont Tremblant in the west,
Mont Sainte-Anne (815 m) at Québec,
Mont Raoul-Blanchard (1166 m),
Mont Bleu (1052 m) and
Mont des Conscrits (1006 m) in Réserve faunique des Laurentides.
Cap-Tourmente (579 m) and
Mont des Éboulements (770 m) are dramatic examples of the scarp face as it drops precipitously to the St Lawrence River.
The more general Laurentian Upland Province may be considered to extend over a larger area of the Canadian Shield, into Northwestern
Ontario and parts of Northern
Minnesota,
Wisconsin,
Michigan, and
New York State, and is recognized by the
United States Geological Survey to include the
Superior Upland. As a southern extension of the Canadian Shield, the
Adirondack Mountains of New York State might also be considered and extension of the Laurentian Upland.
Geology
The Laurentian Upland is primarily made up of ancient
Precambrian igneous,
metamorphic, and
sedimentary rock. With the exception of the river valleys and
lacustrine basins, it's a rolling to mountainous
peneplain that ranges from 800 to 1400 feet above sea level.
Further Information
Get more info on 'Laurentian Highlands'.
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