Figure 2. Geologic map of the northwest corner of the Canyon Ferry Dam 30' x 60' quadrangle, Montana (Reynolds and Brandt, 2005) showing the complex geology of the Montana disturbed belt terminating on the east against weakly deformed Paleozoic rocks of the continental crust and on the south along the trace of the Lewis and Clark tectonic zone. See the original published map for an explanation of the units.
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