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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