Climate is the long-term weather pattern in an area, typically averaged over 30 years. [1] [2] More rigorously, it is the mean and variability of meteorological variables over a time spanning from months to millions of years. [1]
Rocks from the earliest well-established ice age, called the Huronian, have been dated to around 2.4 to 2.1 Ga (billion years) ago during the early Proterozoic Eon. Several hundreds of kilometers of the Huronian Supergroup are exposed 10 to 100 kilometers (6.2 to 62.1 mi) north of the north shore of Lake Huron, extending from near Sault Ste. Marie to Sudbury, northeast of Lake Huron, with ...
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