ide," on the
Mackenzie, and in horizontal strata in an island near that rock, where
it forms angular concretions.

After passing Sellwood Bay, the north and east shores of Cape Parry, and
the islands skirting them, present magnificent cliffs of limestone,
which, from the weathering action of the waves of the sea, assume
curious architectural forms. Many of the insulated rocks are perforated.
Between the bold projecting cliffs of limestone there are narrow
shelving beaches, formed of its debris, that afford access to the
interior. The strata have generally a slight dip to the northward, and
the most common Rock is a yellowish-gray dolomite which has a very
compact structure, but presents some shining facets of disseminated
calc-spar. This stone, which is not to be distinguished by its
mineralogical characters from the prevailing limestone of Lake Winipeg,
and at the passage of _La cloche_ in Lake Huron, forms beds six or eight
feet thick, and is frequently interstratified with a cellular limestone,
approaching to chert in hardness, and exhibiting the characters of
rauchwacke. In some parts, the rauchwacke is the predominating rock, and
has its cells beautifully powdered with crystals of quartz or of
calc-spar, and contains layers of chert of a milky colour. The chert has
sometimes the appearance of calcedony, and is finely striped.

[Sidenote: 208, 209] The extremity of Cape Parry is a hill about seven
hundred feet high, in which beds of brownish dolomite, impregnated with
silica, are interstratified with a thin-slaty, gray limestone, having a
compact structure.[44] The vegetation is very scanty, and there are some
spots covered with fragments of dolomite, on which there is not the
vestige even of a lichen. Many large boulders of greenstone were thrown
upon the N.W. point of Cape Parry. The islands in Darnley Bay, between
Capes Parry and Lyon, are composed of limestone.

SEA-COAST.--FORMATION OF SLATE-CLAY, SANDSTONE, AND LIMESTONE, WITH
TRAP-ROCKS.

From Cape Lyon to Point Tinney, the rocks forming the coast-line are
slate-clay, limestone, greenstone, sandstone, and calcareous
puddingstone.

[Sidenote: 214] Near the extremity of Cape Lyon the _slate-clay_
predominates, occurring in straight, thin, bluish-gray layers, which are
interspersed with detached scales of mica. [Sidenote: 215] It sometimes
forms thicker slates, that are impregnated with iron, and occurs alone,
or interstratified in thin beds with a reddi