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~1 <br /> <br />faults is not provided by Mailed's report, as they were not mapped <br />by several other major investigators of the Dowe Flats area. In <br />' addition, examination of large scale aerial photography in <br />connection with this study did not reveal any evidence of the <br />' northeastern tending fault and only limited evidence of the <br />northwest tending fault. Therefore, the northeast tending fault is <br />' not believed to be present, and the northwest tending fault, if <br />present, is a localized small scale feature. <br />All of these units are Upper Cretaceous in age. The synclinal <br />' structure of the central Dowe Flats basin is such that the youngest <br />(Pierre Shale) formation is exposed over much of the eastern <br />portion of the valley bottom with the older strata forming <br />concentric horseshoe like rings as they outcrop around the valley <br />' perimeter on the east and west margins. <br />Structurally the region surrounding Dowe Flats is extremely <br />' complex with both intense and sometimes superimposed folding as <br />well as Post-Cretaceous faulting. In this context, the simplicity <br />of the central interior portion of Dowe Flats is almost anomalous. <br />Interpretation of available information does not indicate the <br />presence of major faulting, shearing, or significant folding in the <br />interior portion of Dowe Flats. <br />~1 <br /> <br /> <br /> <br /> <br />' 50 <br />1 <br />