mcconnett. | GEOLOGICAL SUMMARY. 33 ¢

up over the limestones by a well-defined overthrust fault, running in
a north-westerly direction.

Mount Selwyn is flanked on the west by a small range composed Ss of
partly of the rocks of the Bow River series and partly of ithe schists Mt. Selwyn.
of the still older Shuswap series, all dipping to the south-west. The
latter overlie the former, but the cause of their superior position was
not ascertained.

The Peace River section through the Rocky Mountains, thus Comparison
resembles the Bow River section through the same range, in the wines
predominance of limestones and in the persistent westerly dips due{to
repetition of the beds by overthrust faulting, but differs from it in
its absence of beds newer than the Triassic, and in the gradually
increasing age of the rocks from east to west.

GroLocicaL SuMMARY.
Archean (Shuswap Series ).

The oldest rocks in the district consist of a series of well foliated Shuswap
mica-gneisses, probably derived to a large extent from sheared erup- ass
tives, lustrous mica-schists, horneblende- and actinolite-schists, quartz-
ose schists and crystalline limestones, filled with mica, hornblende and
other secondary minerals. The rocks of this series are usually evenly
bedded and conform in dip with the overlying formations.

Rocks of the Shuswap series are found on both sides of the Finlay Distribution.
from its mouth up to its junction with the Ingenica. North of this
point, the formation divides around a bay filled with newer rocks.
The eastern limb follows the eastern slope of the Finlay Valley north-
westward to the Quadacha and for some distance beyond. It has a
width at Paul’s Branch, where it forms the most westerly range of
the Rocky Mountains, of four miles. This width decreases towards
the north and increases to the south.

The western limb bends away from the Finlay above the Ingenica,
but crosses it again at the great bend which the Finlay describes after
leaving the Rocky Mountains, and continues on to the north. The
width of this band was not ascertained, as its western boundary was
not reached.

A second area of Shuswap rocks, separated from the first by a band
of limestones, occurs on the Omenica River above the Oslinca. The
gneisses in this occurrence are coarser in grain than is usually the case,
and in places have a granitic appearance. The band has a width of
ten miles.

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