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whereas Holland (1954) described a cleavage that fanned Faults
through the hinge. Near Yanks Peak, where Holland
(1954) described the antiform, the hinge is tight and the
fanned cleavage is likely the axial planar cleavage to the
antiform. The arched cleavages are described from an
area of the Lightning Creek Anticlinorium where it is very
broad. In this area the axial planar cleavage did not form,
and the arched cleavages are those of earlier structures,
now folded about the axis of the Lightning Creek Anti-
clinorium (Fig. 49).

No strike or cross-faults that can be associated with the
period of ductile shortening have been positively identi-
fied. A postulated thrust fault (Keithley Thrust) that dis-
places garnet grade metamorphic rocks onto those of
chlorite grade may have been active during the later part
of the ductile shortening. Although the trace of it is mod-
erately well defined the terminations of the fault are
poorly constrained. The configuration of the metamor-
phic mineral distributions could also be the result of post-

These folds represent deformation in a viscosity metamorphic folding but the northeastern transition from
regime intermediate between ductile and brittle. They garnet to chlorite mineral assemblages is sharp and more
formed during intermediate stages of uplift of the sheared characteristic of a fault.

structural package of the Snowshoe Group.

71