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.