=. ‘hE; Y g Nh | ie Os if ‘ IN Hard imp. Coal 3" Grey shale 3" Dip 53° Bec } = = ee SSS SS ¥ Le FER esr = im = —= R ' Leve/ of drift Geological Survey, Canada. Figure 13. Sketch of folded coal seam, No. 1 shaft, Camp Robertson. Only the upper portion of the Robertson seam is here shown.