Quote:
Originally Posted by Chronamut
and before that the entire area from the lip of the escarpment all round lake ontario was actually lake ontario - I think it was called lake iroquois at that point - it would have entirely covered toronto - there used to be a glacial deposit further up that dammed a lot of the water making it a lot higher, once that broke down the water drained something like 100 or 200 feet, which is why the entire area around lake ontario looks like a giant half filled bathtub.
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Partially true -- but it wasn't that deep, and it was created due to ice dams from the retreating ice sheet preventing meltwater and runoff from flowing out. I'm trying to recall university physical geography here, but the surface of Lake Iroquois was about ~100 feet higher than Lake Ontario, and its shoreline was a few km inland of the current one. There is evidence of shorelines and sandbars in Ontario and New York state. A prime example is Burlington Heights, where the High Level Bridge is: a sandbar from Iroquois that carries on southeastward as the rise that skirts downtown Hamilton and goes through Durand... Television City is proposed to be built upon it. This lake existed around 13,000 years ago though, when the ice age was coming to an end.
The escarpment doesn't represent a lakeshore. It's been there for millions of years, and was there before the last glaciation, though that glacial period likely radically altered it through erosion.