The glacial history of the Rouche Montonee is explained by looking at the direction of the striations and the plucking, the location and direction of each give a pretty complete history of that area. Another way that makes understanding the history of the formation is by having good understanding of the rest of the area. One of the biggest known products of the most recent glaciation was the presence of glacial Lake Agassiz (pictured below) which the main basin for the melting glacial run-off to flow into. This lake is long since gone and most of its waters have flowed either into the Great Lakes or into the the Hudson Bay. Glacial Lake Agassiz is believed to the largest freshwater lake to ever have existed.
Looking just at the striations that are present on the Roche Moutonnee it can be known that there were two separate glacial movements over that large piece of bedrock, since there are two separate directions. The two different directions are almost perpendicular, showing us that they are definitely not from the same glacial movement. One of the two directions is coming straight away from Lake Superior and the other is running nearly parallel with the coastline. It can also be noted that the first of the two glaciations were moving away from Lake Superior because that striae has been eroded more and the other striation cuts across it. Also it is known because the plucking region occured with the glaciation that moved parallel to the coast and that happens on the side of the roche moutonnee that faces the direction the glacier is moving.
A diagram showing how the Great Lakes were formed as the Glacial lobes retreated north towards Hudson Bay.