Labrador ice sheet
Ice sheet that periodically covered North America over the last ~2.6 million years
| Labrador Ice sheet | |
|---|---|
| Type | Continental |
| Location | Canadian Shield |
| Lowest elevation | Sea level |
| Terminus | North – Baffin ice sheet East – Atlantic Ocean South – Long Island, New York to the Great Lakes |
| Status | Gone |
The Labrador ice sheet was a major ice sheet that periodically covered large parts of North America during glacial periods over the last ~2.6 million years. The seam between the two ice sheets passed over the northern tip of the Ugava Peninsula passing south across Hudson Bay and on to the Ontario shore near Fort Stevens. This seam continued southward across Lake Superior, east of the Keweenaw Peninsula of Michigan. Southward into Wisconsin, along the Lake Michigan shoreline, crossing into western Illinois. Reaching down the Mississippi River valley to its junction with the Missouri River, it reaches its most southern point.[2] At this point, the ice sheet no longer abuts the Keewatin ice sheet.
Centers
The Labrador Ice Sheet radiated from two focus points. The primary Quebec Dome, centered over of Ungava Peninsula. A second dome, called the Hudson Bay Dome was to the west on shore of Hudson Bay, near Churchill, Manitoba.
See also
- Laurentide Ice Sheet
- Cordilleran ice sheet
- Keewatin ice sheet
- Baffin ice sheet
References
- ^ Fulton, R. J. & Prest, V. K. (1987). Introduction: The Laurentide Ice Sheet and its Significance. Géographie physique et Quaternaire, 41 (2), 181–186
- ^ John P. Bluemle; Guide to the Geology of South-Central North Dakota; Burleigh, Dickey, Emmons, Kidder, LaMoure, Logan, McIntosh, and Stutsman Counties; Educational Series 6; North Dakota Geological Survey, E. A. Noble, State Geologist; Bismarck, North Dakota; revised 1975
Bibliography
- Fulton, R. J. & Prest, V. K. (1987). Introduction: The Laurentide Ice Sheet and its Significance. Géographie physique et Quaternaire, 41 (2), 181–186.
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Continental glaciations
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- Laurentide Ice Sheet
- Last Glacial Maximum
- Canadian Shield
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- Proglacial lake
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| Erosional | |||
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| Depositional |
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Category
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| Quaternary / Late Cenozoic |
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| Paleozoic |
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| Ediacaran |
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| Cryogenian-Snowball Earth | ||||||
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| Mesoarchean |
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| Cenozoic Era (present–66.0 Ma) |
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| Mesozoic Era (66.0–252 Ma) |
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| Paleozoic Era (252–539 Ma) |
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| Proterozoic Eon (539 Ma–2.5 Ga) |
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| Archean Eon (2.5–4 Ga) | |||||||||||||
| Hadean Eon (4–4.6 Ga) | |||||||||||||
ka = kiloannum (thousands years ago); Ma = megaannum (millions years ago); Ga = gigaannum (billions years ago). See also: Geologic time scale •  Geology portal •  World portal | |||||||||||||
