: J.G. Gray has traced the Carbonifcrous rocks along their
strike from tho west half of the Fort Fraser map-arca ino rocks
along the shores of Stuart Lake assigned by G.M. Dawson ~’~ to the

pe

Report on Exploration in British Columbia, Gcol. Surv., Canada,
Rept. of Prog. 1876-77, pt. B, pp. 55-57 (1878)

Report on an Exploration from Port Simpson on the Pacific Coast
to Edmonton on the Saskatchewan; Geol. Surv., Canada,
Rept. of Prog. 1879-80, pt. B, p. 106 (1881).

a Ra a mau cree nh move i rare we cog ee we a a ee

Lower Cache Creek series of Carboniferous age. Dawson bases his
conclusions as to their age upon the occurrenee of Fusilinac and
crinoid stems in the limestones of Pope Mountain, The writer
collceted fossils from the limestones outcropping along the south
shore of Kazchek Lake, and this collection was reported on by

F.H. MeLearn of the Geological Survey as follows: "This lot contains
a variety of crinoid stems. Thoy may be of Palacozoic age, but I do
not feel I can make a dating on the basis of these fossils",

Group 1. The most extensive occurrences of this group are found
along the shores of Stuart, Trembleur, and Cumninghan Lakes, and
in the Middle River Range, and in areal extent they occupy 150
square miles,

The cherts, which aro the most charactcristic rocks of
the group, are generally blue-grey, but range in shade from cream-
grey to black, and in placos are pale green, They are fine-grained,
and are thinly bedded, the beds being only $ to 2 inches thick with
thin partings of ergillaccous material between thom. Only very
rarely do the argillaccous partings cqual the chert beds in thiclmess.
In many localities the partings have been metamorphosed to mica schist.
The cherts are greatly crumplod,

Besides the argillaccous partings separating the thin
beds of chert, argillite and slate, in thicknesses ranging from
100 to 3,000 feet or more, are interstratificd with the cherts,.
These argillites and slates are grey to black, but where iron
minerals are present they weather to shades of brown and red. Thoy
commonly contain much carbonaceous material, which gives them a
lustrous appearance. These argillaceous sediments in many places
have a blocky appearance, due to jointing in three directions, two
nearly vertical, and one nearly horizontal.