91

stones, with lesser unmetamorphosed limestones, lying unconformably
beneath Silurian beds, and unconformably above a series of quartzites,
schists, slates, and basic igneous rocks of probable Precambrian age. This
area is within the Rocky Mountains, and the rocks in it show no direct
affinities with those of the Western Cordilleran region (Lord, 1947, p. 230),
in which the Aiken Lake map-area is included. The tan quartzites have
been correlated with the Cambrian Macdougal group of the Mackenzie
Plain. The relation of these beds to the Ingenika group is not known;
the two assemblages may be in part equivalent, although the Macdougal
group is obviously part of a much thinner, possibly foreland facies. The
crustal movement that produced the pronounced unconformity below the
Silurian beds in this area must also have affected the Aiken Lake region,
and evidence of it should be preserved if sedimentary deposition occurred
both before and after the disturbance. The lack of any such unconformity
in the Ingenika group suggests that all beds assigned to the group are at
least pre-Silurian in age.

WOLVERINE COMPLEX

NAME AND DistTRIBUTION

The name “Wolverine complex” was given by Armstrong and Thurber
(1945, p. 5) to an assemblage of gneisses and schists, with intimately
associated granitic rocks and pegmatites, in Wolverine Range of Manson
Creek map-area. In Wolverine Range, the rocks are so altered by
metamorphism and granitization that it was not found possible to divide
the complex into stratigraphic units. These rocks may be traced north-
westward into Aiken Lake map-area, where it has been found that they
correspond mainly, and probably entirely, to those of the Tenakihi and
Ingenika groups. In Aiken Lake map-area the name Wolverine complex
has been retained for those rocks of the Tenakihi and Ingenika groups
that have been profoundly and distinctly altered by processes of metamor-
phism and granitization additional to the regional metamorphism suffered
by all the rocks of these groups, and for the intrusive and meta-igneous
rocks intimately associated with the intensely metamorphosed sediments.

Such rocks occupy an area of about 150 square miles, in a belt 5 to 8
miles wide, running transverse to the strike of the formations, and extend-
ing northeast from Blackpine Lake to Tomias Lake and Ingenika Cone.
Along its southeast side, where exposed, the belt adjoins typical Ingenika
group rocks at a fault contact. The northwest side of the belt grades
into Tenakihi and Ingenika group rocks of lower metamorphic rank.

LitrHOLOGY

The rocks in Aiken Lake map-area assigned to the Wolverine complex
consist mainly of feldspathic quartzite, quartz-mica-feldspar schist, gneiss,
and migmatite, with lesser amounts of silicated marble, skarn, amphibolite,
and amphibolite-gneiss. These meta-sedimentary rocks are invaded by a
variety of acidic rocks ranging from granodiorite stocks to narrow
pegmatite and aplite dykes and lit-par-lit injections. The amount of