Graphics courtesy of Parker Gay; Figure 1 from Short, et al.

Basement Mapping Highly Crucial ... return to story

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Figure 1

Figure 2

Figure 3a, b, c, d

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Figure 2.

The basement fault block pattern as mapped by surface geology on southern edge of Canadian Shield in the "driftless" area of Wisconsin. Note rock type changes that take place across shear zones, more clearly shown in top part of mapped area.