The Formation of the Great Lakes is a well-researched and documented theory that postulates that the 5 Great Lakes were dug out by glacier action during Ice Ages due to the presence of scour marks on rocks at the bottom of these lakes. I see common sense problems of this theory and suggest an alternative. First off, let’s discuss the 5 Great Lakes. 1. There are only 4 as the Michigan/Huron system is, in actuality, 1 lake. 2. Lake Ontario is below the Niagara Escarpment elevation by approximately 300′ and has confirmed evidence that it was hit by a solid object collision. It has a maximum depth of 802′ and an average depth of 283,’ putting it into the category of an impact crater that filled in with water. This lake does not fit into the proposed theory presented, so it will be excluded, and now we’re down to 3 Great Lakes. 3. Lake Erie’s deepest spot is 210′ with an average depth of 62′. This makes it a Natural Lake and is, in reality, a huge river conveying water from the Superior/Michigan/Huron drainage basin and is also excluded from this theory. So, now we are down to 2 Great Lakes. 4. The Michigan/Huron (MH) system is the brunt of this theory and gives evidence that this entity is, in fact, a very large impact crater from a large object collision many eons ago. Like Lake Manicouagan, it is a complex collision structure with the water features as the circular ring and the Lower portion of Michigan State is, in reality, the rebound core of that collision. Its final shape is a result of glacier action over many centuries. This impact site shows evidence of a low hit from the southeast in a northwest direction. This low angle directed most of its energy into the earth into a downward vector and created: 5. Lake Superior, a Rift Lake. Like the Schumacher/ Levy collision of 1994, a trail of broken objects is responsible for the deep lakes to the northwest that pepper the North American continent until they disappear beyond the land mass into the Arctic Ocean beyond. 

A satellite picture of the 5 (specified) Great Lakes. 
Satellite view of the Great Lakes and other possible Impact Crater Lakes lying in a straight lined path to the northwest of the Great Lakes. 

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