Glacial Lake Iroquois was a prehistoric proglacial lake that existed at the end of the last ice age approximately 13,000 years ago. The lake was essentially an enlargement of the present Lake Ontario that formed because the St. Lawrence River downstream from the lake was blocked by the ice sheet near the present Thousand Islands. The level of the lake was approximately 30 m (~100 ft) above the present level of Lake Ontario. In geology, a proglacial lake is a lake formed by the damming action of a moraine or ice dam during the retreat of a melting glacier. ... Variations in CO2, temperature and dust from the Vostok ice core over the last 400 000 years For the animated movie, see Ice Age (movie). ... Lake Ontario seen from near Wolcott, New York Lake Ontario, bounded on the north by Ontario and on the south by Ontarios Niagara Peninsula and by New York State, is one of the five Great Lakes of North America. ... The Saint Lawrence River (French fleuve Saint-Laurent) is a large west-to-east flowing river in the middle latitudes of North America, connecting the Great Lakes with the Atlantic Ocean. ... 1000 Islands near Ivy Lea, Ontario The Thousand Islands are a chain of islands that straddle the U.S.-Canada border in the Saint Lawrence River as it emerges from the northeast corner of Lake Ontario. ...

The lake drained to the southeast, through a channel passing near present day Rome, New York. The channel then followed the valley of the Mohawk River to the Hudson River. Rome is a city located in Oneida County, New York. ... For other uses, see Mohawk River (disambiguation) The Mohawk River is a major waterway in north-central New York. ... View of the Hudson in the 1880s showing Jersey City The Hudson River, called Muh-he-kun-ne-tuk in Mahican, is a river running mainly through New York State but partly forming the boundary between the states of New York and New Jersey. ...

The lake was fed by Early Lake Erie, as well as Glacial Lake Algonquin, an early partial manifestation of Lake Huron, that drained directly to Lake Iroquois across southern Ontario, along the southern edge of the ice sheet, bypassing Early Lake Erie. See also List of prehistoric lakes External Links Michigan State University, Dept. ... The Great Lakes from space; Lake Huron is the third from the left. ... Motto: Ut Incepit Fidelis Sic Permanet (Latin: Loyal she began, loyal she remains) Official languages English, French (in some areas) Capital Toronto Largest city Toronto Lieutenant-Governor James K. Bartleman Premier Dalton McGuinty (Liberal) Parliamentary representation  - House seat  - Senate seats 106 24 Area  - Total  - % water Ranked 4th 1,076,395...

The subsequent melting of the ice dam resulted in a sudden lowering of the lake to its present level, and setting off the Younger Dryas episode. The Younger Dryas stadial, named after the alpine / tundra wildflower Dryas octopetala, and also referred to as the Big Freeze [1], was a brief cold climate period following the Bölling/Allerød interstadial at the end of the Pleistocene, and preceding the Preboreal of the early Holocene. ...

The prehistoric shoreline, marked by a ridge known as the Iroquois Shoreline, can be discerned in places around Lake Ontario.This can be seen, for instance, in Toronto parallelling Davenport Road near Spadina Avenue, and also nearby in Scarborough, where the prehistoric shoreline takes the form of earthen cliffs at the modern lakeshore (called the Scarborough Bluffs). Template:Hide = Motto: Template:Unhide = Diversity Our Strength City of Toronto, Ontario, Canadas Location. ... Motto: City of Scarborough (Dissolved), Ontario, Canadas Location. ...

See also

• List of prehistoric lakes

This a partial list of prehistoric lakes. ...

External links

• History of Lake Iroquois
• Lake Iroquois and its shore cliff, showing map of the lake
• Deglaciation of the Central St. Lawrence Lowland
• Great Lake Genesis