wcconnete. | OMENICA RIVER SECTION. 23 ¢

the Omenica and Finlay River districts, but so far as observed are
everywhere confined to the valleys. They usually strike parallel, or
nearly so, to the general direction of the valleys in which they lie, and
conform approximately in dip to the older rocks on which they rest.
Above the Black Caiion the strike is 8. 28° E. and the dip is south-
westerly at an angle of 30°.

The materia's of these conglomerates and associated beds have been
derived from the Archean gneisses and schists and the Paleozoic
schists and limestones which floor the surrounding country. The
conglomerate consists of pebbles of quartz, felsite, chert, schist and
limestone, imbedded in a soft sand or clay matrix, occasionally hard-
ened by a feruginous cement. The shales are usually dark in colour,
are coarsely laminated and often pass by the gradual addition of
arenaceous material into a shaly sandstone. Mica enters larzely into
the composition of the rocks of this series, and in some iastances heds
a foot or more in thickness were observed, which consisted almost
entirely of this material.

Fossil leaves and other vegetable remains are abundant in some of Fossils.
the shales and shaly sandstones, but are usually in a somewhat frag-
mentary condition. Among the specimens brought back, Sir J. Wm.
Dawson has recognized fragments of the stem of an Arwndo, Sequoia
Langsdorffii and S. Couttsie, a Populus like P. Arctica, a Platanus, a
Quercus, a Viburnum, probably V. asper, Newberry, and a carpolite
resembling Leguminosites arachnoides, Lesquereux. The only animal
fossils found were a couple of Ostracods which have not yet been
specifically determined.

The Tertiary beds are exposed above the cafion in a nearly con-
tinuous section for about a mile, and at intervals for several miles
farther. Two miles and a half below the mouth of the Tchutetzeca a
ledge of limestone projects out from the left bank, and is also exposed
on an island in the centre of the stream. ‘The limestone here is very Limestone ex-
hard, an : evidences its proximity to a line of strong disturbance in its PS"
whitened and cracked appearance, and in the schistose condition of
some associated shaly beds. A mile further up, an exposure of hard-
ened shales, holding some beds of impure limestone, was noticed in the
right bank, which probably belongs to the Laramie series. At the
bend of the Omenica above the mouth of the Tchutetzeca, grayish-
limestones are exposed in several places, and they also occur in the
mountains north of the river. No fossils were found in these lime Age of lime-
stones, and their age is therefore uncertain, but they probably belong “™®