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• central part of sec. 29 where an exposure of relatively resistant <br />I <br />shale and sandstone occurs in an island of Lewis Shale surrounded <br />by Alluvium. <br />Two regional folds are mapped in the area. The Fish Creek <br />anticline is mapped from the south-central part of sec. 17 <br />northward to the east-central part of sec. 32. In the southern <br />part of the area coal mining is projected across the anticline in <br />sec. 17, and farther south, outside the area mapped, the main <br />mining will be on the western flank of the anticline in secs. 19 <br />and 20. <br />An unnamed syncline is mapped from the southeastern part of <br />sec. 16 to the northwestern part of sec. 33. <br />The positions of the anticlinal and synclinal axes are mapped <br />• generally. In the northern part of the area, these folds are <br />largely obscured by Alluvium as in Scotchmans Gulch. <br />Only one Eault was mapped in the area and it is obscured by <br />Alluvium in Scotchmans Gulch. The fault is mapped from the north- <br />central part of sec. 18 into the southwestern part of sec. 5. The <br />basis for the fault is offset of the Williams Fork Formation-Lewis <br />Shale contact in the NE cor. sec. 7/NW cor. sec. 8 where the <br />movement indicated is down on the western side of the fault. <br />Alluvium covers the fault for all but the southernmost 1400 feet <br />where it is mapped in the Williams Fork Formation. Outcrop data <br />could not be found in this reach of the fault which was mapped on <br />the basis of a strong alignment that essentially followed the <br />headwater drainage of Scotchmans Gulch. <br />• Alignments usually are found in the photogeologic <br />interpretation. These linear or curvilinear features are based on <br />15 <br />