e last mentioned. (157.)

[38] _Specimens from the cliffs in lat. 66-3/4 degrees._

159 Very fine-grained sandstone, with much clayey basis--portions of the
bed iron-shot.

160 Sandstone fine-grained, and appearing, when examined with a lens, to
be composed of minute grains of whitish translucent quartz, black Lydian
stone, and ochre-coloured grains, probably of disintegrated felspar.

161 Rounded grains of nearly transparent quartz united without
cement--this stone is friable.

162 Sandstone composed of grains like the preceding, united by a basis,
and forming a firmer stone.

163 Hard, thin, slaty, bluish-gray sandstone, much iron-shot.

164 Fine-grained, bluish-gray sandstone, not to be distinguished in
hand-specimens from some of the sandstones which occur at the rapid in
Bear Lake River.

[39] _Horizontal limestone beds lying under the sandstone._

166 Fine-grained limestone, with an earthy fracture, coloured brown and
grayish-white in patches.

167, 168 Similar stone to preceding, containing many shells. Some beds
contain only broken shells.

169 Bed of imperfectly crystalline limestone, of a brownish-gray colour,
traversed by veins of calc-spar.

170 Fragments containing madrepores and chain coral--occur amongst the
debris of the limestone cliffs.

[40] _Sandstone cliffs twenty miles below Fort Good Hope._

173 Friable sandstone, composed of grayish-white quartz, in smooth,
rounded grains, cemented by a brownish basis. Some carbonaceous matter
is interspersed through the stone, and it contains small fragments of
bituminous shale.

174 Calcareous sandstone passing into slate-clay--bluish-gray colour.

175 Black, flinty-slate, with a flat conchoidal cross fracture. Some of
the pieces appear to be rhomboidal distinct concretions.

176 Dull, flinty-slate, with an even fracture.

178 Thin-slaty blackish-gray sandstone, much indurated, containing
scales of mica.

179, 180 Bluish-gray sandstone, containing many minute specks of
carbonaceous matter; also, in patches, grains of chert, and
flinty-slate, and imbedded pieces of iron-shot clay, which has obscure
casts of shells. Scales of mica are interspersed through this stone.

181, 182 Sandstone containing specks of bituminous? coal, and casts of
some vegetable? substance.

183 Gray limestone, much impregnated with quartz, and having an
imperfect crystalline structure.

[41] Mackenzie notices the precipices of "gray stone," which bound the
riv