MOUNTAIN - eo 53°15" \ 3 Va ° Sa Da ¢ j Seren ms TWO SISTERS A y Aa B4 MOUNTAIN & f ee _ eg Spectacle 4 MOUNT Lokes a MURRAY FLAT TOP MOUN TAIN jm s l—— DF mecaeve STE WWINGDAM SOVEREIGN MOUNTAIN MOUNT f KIMBALL | , | ? BLACK STUART f 4 MOUNTAIN Little Map of the Barkerville Terrane divided into arbitrary structural domains by the dashed black lines. The equal area nets record the averaged plot of poles to the ductile style cleavage for each domain. The Lightning Creek Anticlinorium (plotted as the black line with open triangles on either side) is defined by the change of dip of the cleavage from southwest to northeast, a feature well displayed by the plots. The diffuse pattern of the plot in the northwest domain records a broad arching of the cleavage as opposed to the most southeasterly plot, which records tighter folding of the cleavage with the presence of a secondary cleavage. Figure 49. are axial surfaces to folds of earlier muscovite. In zones of garnet grade metamorphism the cleavage may be equivalent to a more ductile flatter foliation parallel to the bedding cleavage. There may, however, be other inter- ceding foliations that are confused because of overprint- ing during stable metamorphic conditions. Folds formed along the set 2 cleavage are not always easily differentiated from earlier ones. Where the folds involve quartzite they are approximately concentric. They are open to tight, but locally isoclinal. The Lightning Creek Anticlinorium, in which layer-parallel cleavage is folded, has features of the set 2 type. The Lightning Creek Anticlinorium. The Lightning Creek Anticlinorium (Fig. 49) is a late antiform superimposed upon a complex of earlier thrusts and folds. It traverses the area from Tregillus Lake southeastward to Cariboo 69