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Gravity map for Lake Superior and surrounding regions. Note the strong positive contrast of the rift valley to its surrounding rocks. The reason for the positive anomaly was not understood until the results of our studies in the Great Lakes - the large volume of dense volcanics in the rift valley causes the anomaly. Data compilation and plotting by the Geophysics Division of the GSC (Geological Survey of Canada).

Even more striking, perhaps, is this aeromagnetic map.

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