Lake Connecticut

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Glacial Lake Connecticut
Location	Over what is now Long Island Sound and coastal Connecticut
Type	Glacial lake
Primary inflows	Meltwater from the Laurentide Ice Sheet
Primary outflows	The Race (tidal outlet between the North Fork of Long Island and Fishers Island)
Basin countries	United States

Max. length	About the same size as present-day Long Island Sound
Average depth	78 feet (24 m) (average depth of Long Island Sound today)

Glacial Lake Connecticut formed over what is now Long Island Sound and coastal Connecticut at the fore edge of the ice sheet of the Wisconsin glaciation, as the lobe of the Laurentide Ice Sheet began to retreat, some 18 to 20,000 years before present. It was dammed by the terminal moraine that now forms the spine of Long Island and Fishers Island. About 15,000 BP, the moraine dam that impounded Lake Connecticut failed; the outlet, known as The Race for its tidal rip currents, lies between the North Fork of Long Island and Fishers Island. For a time, much of the lake bed was exposed to wind-driven erosion: the cue is found in soundings that reveal regional unconformities in the sediment bed of Long Island Sound.

The fore-edge lake formed by glacial meltwater expanded to be about the same size as present-day Long Island Sound; it may have been connected at times with similar freshwater lakes in Block Island Sound and Buzzards Bay, while sea level was low. The fairly shallow average depth of 78 feet (24 m) of today's Long Island Sound is the result of fine lake-bottom sediments deposited as glacial outwash slowed in Lake Connecticut. Suspended as rock flour, the fine sediments would have rendered Lake Connecticut a turquoise blue-green.

The end of Lake Connecticut was marked by a series of intervals of salt water incursion after about 15,000 BP and subsequent refreshening, as rising sea levels and isostatic rebound of land depressed by the former weight of ice sheets adjusted to one another.

References

Geologic History of Long Island Sound at the Wayback Machine (archived May 29, 2010)

Pleistocene proglacial lakes and related seas

Africa

Antarctica

Lake Washburn

Asia

Europe

Baltic Sea	Ancylus Lake Baltic Ice Lake Littorina Sea Mastogloia Sea Yoldia Sea
Russia	Lake Komi
Great Britain	Lake Harrison Lake Lapworth Lake Pickering

North America

Nelson River drainage	Lake Agassiz Lake Bassano Lake Souris Proglacial lakes of Minnesota
James Bay drainage	Lake Ojibway Tyrrell Sea
Great Lakes	Champlain Sea Lake Admiralty Lake Algonquin (Multiple basins) Lake Arkona Lake Chicago Lake Chippewa Lake Dana Lake Duluth Early Lake Erie Lake Frontenac Lake Houghton (glacial) Glacial Lake Iroquois Lake Lundy Lake Maumee Lake Minong Nipissing Great Lakes (Multiple basins) Early Lake Ontario Lake Saginaw Lake Stanley Lake Tonawanda Lake Warren Lake Wayne Lake Whittlesey
Columbia River system	Lake Allison Glacial Lake Columbia Lake Lewis Glacial Lake Missoula
Great Basin system	Lake Bonneville Lake Lahontan
Puget Sound system	Glacial Lake Hood Lake Nisqually Lake Puyallup Glacial Lake Russell Glacial Lake Sammamish Lake Skokomish
Upper Missouri River	Lake Chouteau Lake Circle Lake Cut Bank Lake Glendive Lake Great Falls Lake Jordan (Montana) Lake McKenzie Lake Musselshell
Upper Mississippi drainage	Lake Kankakee Kankakee Outwash Plain Lake Wisconsin
Ohio drainage	Lake Monongahela Lake Tight Teays River
Hudson valley	Lake Albany Lake Passaic
New England	Lake Cape Cod Lake Connecticut Lake Hitchcock Lake Merrimack Lake Nantucket Sound Lake Stowe
California	Lake Cahuilla Lake Corcoran Lake Harper Lake Manix Lake Manly Lake Modoc Lake Mojave Lake Panamint Lake Russell Lake Tecopa Lake Thompson
Rio Grande rift	Lake Alamosa Lake Estancia Lake Palomas Lake San Agustín
Alaska	Lake Atna

South America

Summary

List of prehistoric lakes

This glaciology article is a stub. You can help Wikipedia by expanding it.

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