Near-surface seismic refraction tomography imaged the basal contact of the Upper Cambrian silica-rich Mt. Simon Formation with that of the underlying Precambrian granite in central Wisconsin. The discrimination between the Mt. Simon and underlying non-conformable contact with Precambrian rocks was based upon a p-wave velocity of 1,700 m/s. Refraction tomography imaged deep, broad tidal channels within the Mt. Simon consistent with the inference that Mt. Simon was deposited in a high-energy near-shore probably fluvial environment. The Mt. Simon is an arenite that has high commercial value.
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