Lake Coleman

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Lake Coleman was a large lake, in the same basin as Lake Ontario, during an interglacial period, approximately 75,000 years ago.[1] Its level was 20 m (65.62 ft) higher than Lake Ontario.[2]

Lake Coleman was named after Arthur Philemon Coleman, a respected geologist whose excavations played a role in discovering the existence of the lake.[3]


  1. Wayne Reeves, Christina Palassio. HTO, Toronto's Water from Lake Iroquois to Taddle Creek and Beyond, Coach House Books. Retrieved on 2018-09-29.
  2. Frank Remiz. Toronto's Geology: including history, biota, and High Park, Toronto Field Naturalists, 2012-01-24. Retrieved on 2018-09-29.
  3. Dennis Duffy. Historicist: The Man the Rocks Talked To: A.P. Coleman uncovered Toronto's prehistory, among other adventures., Torontoist, 2017-08-19. Retrieved on 2018-09-29. “In honour of the geologist, a prehistoric body of water covering this region before Lake Ontario came to be was named Lake Coleman after his death.”