A good starting point:

• http://www.trca.on.ca/water_protection/strategies/lakeontario/#places
  Toronto Area Conservation Authority's site.

Additional resources:

• http://www.science.uwaterloo.ca/earth/waton/watonf99.html
  U of Waterloo's site with article on the Great Lakes.
• http://www.torontobay.net/
  Site related to Toronto Bay Initiative, which has a goal of regenerating the city's harbour into a healthy ecosystem

• Coleman, A.P., 1937;
  Lake Iroquois and the Geology of the North Shore of Lake Ontario,
  Ontario Department of Mines, 45^th Annual Report, Volume XLV, Part VII.
• Karrow, P.F. and Calking, P.E. (editors), 1985;
  Quaternary Evolution of the Great Lakes,
  Geological Association of Canada, Special paper 30.
• Tovell, W.M., 1979;
  The Great Lakes,
  Royal Ontario Museum, Encounter Series.