Agassis Lake Glacier

Agassis Glacier Lake is a former huge glacial lake located in the center of North America. Obtaining a glacial runoff at the end of the last glacial period, its area was larger than all present-day Great Lakes combined, and it had more water than all lakes in the world [1]. Named in honor of Jean Louis Agassis, a prominent Swiss-American naturalist.
1 Geological History
2 Remains of a Lake
3 See. also
4 Notes
5 Sources - Geological History
During the last glacial period, northern North America was covered by glaciers that have been steadily increasing and decreasing with climate change. This continental glacier, formed between 30,000 and 10,000 years ago, is now known as the Wisconsin Glaciation and has covered much of central North America. During the melting of the glacier, it formed a huge pre-glacial lake [2]
About 13,000 calendar years to date (nearly 12,000 ago, according to 14C carbon isotope analysis), the lake occupied most of Manitoba, western Ontario, northern Minnesota. , northeast Dakota and Saskatchewan. At its greatest transgression, the lake occupied 440,000 km², more than any present-day lake (including the Caspian Sea).
The lake drained at various times south through Traverse Gap into the Warren River Glacier [3], east through Kelvin Lake (nowadays Lake Nipigon) and further into Lake Superior [4] or west through the Mackenzie River through the territory of Yukon and Alaska. [1] Climatologists estimate that during the greatest flood, about 13,000 ago, the lake dumped a large volume of water through the Great Lakes region and the St. Lawrence River into the Atlantic Ocean. This could be the cause of the late Dryas stage [1] [5]. Due to the renewal of the glacier and its subsequent melting, about 9,900 years ago, the lake was again transgressed. These events have had a significant impact on the climate, sea level and possibly early human civilization.
Most of the final drainage of Lake Agasses could occur in a very short time, perhaps in as little as one year. The last major flood occurred about 8,400 calendar years to date (nearly 7,700 ago according to the 14C carbon isotope) when the lake dumped its water into the Hudson Bay. The final drainage of the lake took place over the next 1,000 years or so.
Remains of Lake
Winnipeg, Winnipegosis, Manitoba, Lake Forest and Rain Lake are remnants of ancient Agassis. The outlines and volumes of these modern lakes are still slowly changing due to the differential isostatic leap.
Other geological and geomorphological evidence of the existence of Lake Agassis can also be seen today. The raised beach, located many kilometers from any body of water, marks the boundaries of the former lake at different times. The fertile soils of the Red River valley, now drained by the Northern Red, formed by lake sediment from the Agassys Lake. Also on Warren Glacier
Perkins (2002)
↑ Ojakangas & amp; Matsch (1982), pp. 106-10. The retreat of glacial margins is not caused by a reversal of glacier flow, but rather from melting of the ice sheet. Id.
↑ Fisher (2003), pp. 271-72 - ↑ Leverington (2003) - ↑ Broecker (2006) - Sources - Boswell, Randy (2007-11-19). Noah's Ark flood spurred European farming. CanWest News Service. Archive of the original for 2013-07-06. Cited 2007-11-22.
Broecker, Wallace S. (26 May 2006). Was the Younger Dryas Triggered by a Flood ?. Science 312 (5777). with. 1146–1148. doi: 10.1126 / science.1123253. PMID 16728622.
Fisher, Timothy G. (March 2003). Chronology of glacial Lake Agassiz meltwater routed to the Gulf of Mexico. Quaternary Research 59 (2) (Academic Press). with. 271–76. doi: 10.1016 / S0033-5894 (03) 00011-5. Cited 18 March 2009.
Fisher, Timothy G. (December 2004). River Warren boulders, Minnesota, USA: catastrophic paleoflow indicators in the southern spillway of glacial Lake Agassiz (PDF). Boreas 33 (4) (Taylor & amp; Francis). with. 349–58. doi: 10.1080 / 0300948041001938. ISSN 0300-9483. Cited September 22, 2007.
Hostetler, S.W .; et al. (2000). Simulated influences of Lake Agassiz on the climate of central North America 11,000 years ago. Nature 405 (6784). with. 334–337. doi: 10.1038 / 35012581.
Leverington, David W.; James T. Teller (2003). Paleotopographic reconstructions of the eastern outlets of glacial Lake Agassiz. Canadian Journal of Earth Sciences 40 (9). with. 1259–78. doi: 10.1139 / e03-043.
Lusardi, B. A. (1997). Quaternary Glacial Geology (PDF). Minnesota at a Glance. Minnesota Geological Survey, University of Minnesota. Cited 2007-09-22.
Ojakangas, Richard W.; Matsch, Charles L (1982). Minnesota's Geology. Minneapolis: University of Minnesota Press. ISBN 0-8166-0953-5.
Perkins, S. (2002). Once Upon a Lake. Science News 162 (18). with. 283. doi: 10.2307 / 4014064. Abstract at Bibliography of Canadian Geomorphology. Canadian Geomorphology Research Group. Archive of the original for 2013-07-06. Cited 2007-12-15.
Pielou, E. C. (1991). After the Ice Age: The Return of Life to Glaciated North America, Chicago: University of Chicago Press, ISBN 0-226-66812-6
Sansome, Constance Jefferson (1983). Minnesota Underfoot: A Field Guide to the State's Outstanding Geologic Features. Stillwater, MN: Voyageur Press. ISBN 0-89658-036-9.
Turney, C.S.M. and Brown, H. (2007) "Catastrophic early Holocene sea level rise, human migration and the Neolithic transition in Europe." Quaternary Science Reviews, 26, 2036-2041; "The Mother of All Floods? November 21, 2007.
Upham, Warren (1896/2002). The Glacial Lake Agassiz. Monographs of the United States Geological Survey XXV (United States Geological Survey / University of North Dakota). Cited by 16 April 2009.
Valley Formation. Fact Sheets. Minnesota River Basin Data Center (MRBDC, Minnesota State University, Mankato. 2004-11-15. Original Archive 2013-07-06. Cited 2007-09-22.
Coordinates: 51 ° W 98 ° W / 51 ° W 98 ° W / 51; -98

Glacial Era
Huron Glaciation • Cryogenium (Caigas • Sturtium • Proterozoic glaciation) •
Andean-Saharan Ice Age • Carru Glacial Age • ▲ Late Paleocene thermal and [ru] • Quaternary icing
Quaternary icing
(Anthropogenic period)
(2.588 million - 11.7 thousand years ago)
Early Pleistocene
(2.588 million - 230 thousand years ago)
Bramertonian glaciation
Middle Pleistocene
(230 - 100 thousand years ago)
Güntz glaciation • Middel Wax • Dnepr glaciation • Rhys • Illinois glaciation • ▲ Dnepr-Moscow interglacial • Moscow glaciation
Last ice age

(110 - 12 thousand years ago)
Dansgora-Eschger oscillation • Wurm iced ng (▲ Meyndorf oscillation • Ancient Dryas) • Wisconsin icing • Mousterian pluvial • Last glacial maximum (ñëèslingian icing • ë Belling oscillation • Ancient diarrhea • ëå Allredian oscillation À Allredian oscillation > Holocene
(Last 12 Thousand Years)
Bond Events • ▲ Pre -oreal Period • ▲ Boreal Period • Neolithic Subpluvial (Drought 3900 BC). e.)
▲ Atlantic Period
(8 - 5 thousand years ago)
Sturegga • 6200 BCE. e. • ▲ Ancient Peron
Holocene climatic optimum • ▲ Bottom platform • Drought 2200 BC.

Subboreal period
(3710 - 450 B.C.)
Pioric oscillation • Cooling of the Middle Bronze Age • Climatic optimum of the Bronze Age • Cooling of the Iron Age in the Sub-Atlantic Period
(450 years BC - now)
▲ Roman climatic optimum • Climatic pessimism of the early Middle Ages • ▲ Medieval climatic optimum • Small ice age • ▲ Global warming in the Glacier
† Vyslinsky ice sheet • † Cordillera Ice Shield • † Lawrence Ice Shield • † Patagonian Ice Shield (South Patagonian • North Patagonian) • † Scandinavian Ice Shield
Water Surface:
† Agassis • † Baltic • † Warren • East • † Missoula • † Ojibwei • Northern Arctic † Tyrrell Sea • Channel Skebland
Modern Ice Shields: Antarctic (East Antarctic • West Antarctic) • Greenland
Related concepts
Iceberg • Veld-Artois Anticlinal • Freezing • Global Cold Glacial • Glacial isostasis • Degr glaciation • Interglacial • Interstadial • Cryolitozone • Earth's cryosphere • Glacier (Outcast • Mountain • Mainland • Shelf) • Ice Age • Ice Age hatch • Ice Age • Ice Age • Ice Age • Ice Age • Ice Age • Ice Age • Pre-glacial • Sub-glacial) • Paleoglaciology • Cooling • Snow Line
Anti-Glacialism • Glacialist Theory • Snow-Land • Monoglacialism • The Paradox of the Weak Young Dream • I blytt-sernander system • Toba catastrophe theory • Milankovitch cycles
Notes: § Era and the periods listed chronologically, ▲ - warm periods, † is there.

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