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<br />amounts of gravel. <br />2. Structure <br />Coal lease applications C-22644 and C-26913 lie on the <br />north-northwest plunging asymmetrical Trout Creek <br />(formerly Oak Creek) anticline, Beds on the flank of <br />this anticline strike N. 50E, and dip 15 degrees on the <br />average toward the northwest, Another synclinal axis <br />trends due north, about a half mile west of the lease <br />area, then swings northeast to join the other eastern <br />synclinal axis and continue northward as the Twentymile <br />Park syncline. At the proposed tracts, the northwest <br />flank of the Trout Creek anticline is broken by at <br />least ten northwest-trending normal faults, almost all <br />downthrown on the southxest side, Vertical displace- <br />ments range from less than 1 to possibly more than 50 <br />feet. It is probable that coal mining in the area will <br />reveal many more faults (Bass, Eby, and Campbell 1956), <br />The area most affected by these faults, as far as coal <br />mining is concerned, is in sec. 8, T, 4 N., R. 86 W „ <br />(C-26913) where displacement is greatest and where <br />there are either two faults creating a graben (more <br />than two faults and cross-fractures), with a consequent <br />complex fracturing of coal and other rocks, <br />The two parcels comprising coal lease application <br />31 <br />