{"id":9167,"date":"2023-10-31T02:10:13","date_gmt":"2023-10-31T01:10:13","guid":{"rendered":"https:\/\/www.lakebeyond.com\/?p=9167"},"modified":"2023-10-31T02:10:13","modified_gmt":"2023-10-31T01:10:13","slug":"how-lake-superior-was-formed","status":"publish","type":"post","link":"https:\/\/www.lakebeyond.com\/how-lake-superior-was-formed\/","title":{"rendered":"How Lake Superior Was Formed"},"content":{"rendered":"
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The Ice Age Origin Story<\/h2>\n

Lake Superior is one of the Great Lakes of North America and is the largest freshwater lake in the world; it is estimated to be 31,700 miles square in area. Although it may come as no surprise, this body of water was not always here. It is believed to have been formed thousands of years ago during the last Glacial Period, or Ice Age. In fact, many of the other Great Lakes of North America —Michigan, Huron, Erie, and Ontario—were also formed in this way.
\nIt is estimated that close to 20,000 years ago, the Laurentide Ice Sheet covered over two-thirds of North America and Canada, advancing southward about as far as Wisconsin and Michigan. This immense sheet of ice eventually began to thaw and recede, with the weight of the ice pushing continental rocks downwards and scooping out depressions in the land. Eventually, these depressions were filled with water and the Great Lakes were formed. <\/p>\n

How the Ice Sheet Deposited Rocks and Sand<\/h2>\n

The great expanse of Lake Superior was greatly shaped by the retreat of the Laurentide Ice Sheet. By pressing downwards and carving out land, the ice sheet created great depressions in the land as it melted. The rocks and sands it left behind created the beds of the future lakes. The melted water of the ice sheet poured into these depressions, filling them up and creating the Great Lakes.
\nThe Ice Sheet’s influence on the landscape is still visible today. The area around Lake Superior is dotted with many islands and islands of sand known as eskers, the terminal moraines of the Ice Sheet. It is believed that these were deposited by the Laurentide glacier and were the products of ice erosion and deposition during the recession of the Ice Sheet.<\/p>\n

Expert Analysis and Opinion on the Formation Process<\/h2>\n

Expert opinions vary on how long ago the Great Lakes were formed. Some experts believe that the Great Lakes were formed about 10,000 years ago whereas others estimate as few 15,000 years. Additionally, scientists are divided on how long the process took and how great the Ice Sheet was. Some estimate that the formation of the Great Lakes may have taken up to 10,000 years and that the Ice Sheet, at its largest, could have been as much as 3,000 feet thick.
\nDr. Jeffrey Ryder, Professor of Geography at the University of Michigan and Research Fellow at the Institute of Great Lakes Research, is a leading expert on Lake Superior’s formation. According to Dr. Ryder, the most accepted origin and formation period of Lake Superior is that it was formed by the retreating glaciers of the Wisconsin Glacier about 10,000 to 15,000 years ago.<\/p>\n

The Impact of the Glacial Erosion<\/h2>\n

Though the formation of Lake Superior was a long, gradual process, glaciers had a significant impact on the lake. In particular, the melting of the glaciers created deep depressions in the landscape and helped shape the landscape in the region. These deep depressions, combined with the sediment left behind by the melting of the glaciers, created the lake we know and love today.
\nFurthermore, the water released by the melting of the glaciers was a driving force behind the development of the lake. This created a series of connected lakes, rivers, and streams which now interconnect the Great Lakes and form the current shore line.<\/p>\n

The Effects of Climate Change on Lake Superior Today<\/h2>\n