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BEST .FIGURE 4 EA57 <br /> <br />• <br />LEGEND <br />S. S. <br />Dakota Formation <br />® Clay <br />HS H4~ H3 <br />(mined from <br />underground <br />SECTION LOOKING NORTFI <br />Scale: 1" = SO' <br />No Vertical Exaggeration <br />HOGBACK AfINE <br />TYPICAL VERTICAL SECTION <br />ROBINSON BRICK CODIPANI' <br />