98: NOTES ON MANGANESE ORES OF LOCH LOMOND.—GILPIN. 
up the Salmon River, to Loch Lomond; and bounded on the 
north by the felsites of East Bay, and on the south by the 
felsites of the Mira Hills. At several points the Lower Car- 
boniferous marine limestone formation crops out beneath the 
millstone grit, and occurs. as isolated patches resting directly on. 
the felsites, and there are patches of the basal carbonte iene 
conglomerates brought up. by faults. through the millstone grit. 
The locality in which these deposits have been discovered is 
on the Salmon River Road, about two miles east of Loch 
Lomond, near the line dividing Cape Breton and Richmond 
Counties. 
The felsites formed a shore along which we now find lime- 
stones, conglomerates, shales and grits exposed as they were 
accumulated under the varying conditions of current, depth of 
water, and of the prevailing winds of the period under con- 
sideration. At some points the limestones rest on the felsites, at. 
other points’ conglomerates and shales intervene. The discoveries 
of manganese ores, more particularly the subject of my paper, 
were made in one of these bays, where the felsites are sueceeded 
by shales, grits, conglomerates, and’ finally by limestones, the 
latter extending apparently from. point to point of the ancient 
Bay. 
The. manganese ores are found at the Western, or ] MecCuish 
Mine, in “sae bedded layers in a soft arenaceous shale, which 
is-in places caleareous, and coated with manganese oxide The 
layers vary in thickness up to 18 inches, and are sometimes 
connected by vertical stringers of ore. The shales when 
weathered present nodules of ore, and large quantities are present 
as films on the cleavage planes of the shale. 
At the Eastern, or Morrison mine, the ore at the time of my 
visit was mined from a bed underlying a thin layer of black 
manganiferous limestone, with red and greenish shales and sand- 
stones and conglomerate. The thickness of the ore and of the 
limestone varied from 2 to 8 inches. The average thickness of 
the two layers being 8 inches. 
The ore was found at several other points in the vicinity as 
lenticular masses and irregular nests in conglomerate, ete., and. 
