When Did Lakes Michigan, Huron, and Superior Drain Via the Nipissing

question 36

Multiple Choice

When did Lakes Michigan, Huron, and Superior drain via the Nipissing spillway to the Ottawa River and the St. Lawrence?

• A) in the Archean, prior to 2.5 b.y. ago as recorded by bedrock lithologies
• B) in the Early Holocene between 10,500 and 5,500, prior to glacial isostatic rebound
• C) prior to the 1930s when the waters were diverted to run hydroelectric stations and create the tourist attraction of Niagara Falls
• D) in the 1920s by damming the rivers to make paths for the early log drives

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