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Updated: May 5, 2025
To begin with the oldest set of rocks, No. 1; they consist chiefly of hornblendic gneiss, and in the neighbouring Hebrides form whole islands, attaining a thickness of thousands of feet, although they have suffered such contortions and denudation that they seldom rise more than a few hundred feet above the sea-level. Laurentian gneiss. 2.
The adventurous type of Anglo-Saxon probably thinks the country too tame; scholars, too trite; ordinary tourists, too dirty. The accommodation and food in San Demetrio leave much to be desired; its streets are irregular lanes, ill-paved with cobbles of gneiss and smothered under dust and refuse.
A. Smith, the line of junction between the granite and the slate, as it stretched inland, in a S.E. direction, we came to a place, where the slate was converted into a fine-grained, perfectly characterised gneiss, composed of yellow-brown granular feldspar, of abundant black brilliant mica, and of few and thin laminae of quartz.
Their great size and angularity, after a journey of so many leagues, has justly excited wonder; for hundreds of them are as large as cottages; and one in particular, composed of gneiss, celebrated under the name of Pierre a Bot, rests on the side of a hill about 900 feet above the lake of Neufchatel, and is no less than 40 feet in diameter.
No man will condescend to grind the corn. There are no circular hand-mills, as among Oriental nations; but the corn is ground upon a simple flat stone, of cithor gneiss or granite, about two feet in length by fourteen inches in width.
There were Maid Marion Falls, where the river drops fifty feet into a narrow gorge cut out of the gneiss and schists of the Laurentian rock over which it flows; Gertrude Falls, a direct drop of sixty feet, which for dignity and beauty is unsurpassed by any feature of the Nascaupee; and Isabella Falls, a system of falls and rapids and chutes extending for more than a mile, where the water poured over ledges, flowed in a foaming, roaring torrent round little rocky islands, or rushed madly down a chute.
The haste of the men to get the picks was not half haste enough for him; and when they began to dig he hurried them the more, until a great pile of snow had been thrown out. It was a weird scene the most weird I have ever known. We stood in a snow-pit amongst the hills, and above us rose in grandeur the great pyramids of basalt and gneiss.
Hence the recession of the banks of the canon has gone steadily on with the downward cutting of the river. Where the rock is homogeneous, as it is in the inner chasm of the dark gneiss, the widening process seems to have gone on much more slowly.
The gneiss, the constituent parts of which are in a state of considerable disintegration, contains large crystals of feldspar; and, though it forms the body of the vein in the mica-slate, it is itself traversed by threads of quartz two inches thick, and of very recent formation. The aspect of this phenomenon is very curious: it appears as if cannon-balls were embedded in a wall of rock.
The formation is upper Silurian or lower Devonian, a transition to gneiss, but not highly metamorphic. No fossils have yet been found: if any exist they would be microscopic. Where talcose it is bluish, and shows streaks of 'black sand, titaniferous iron. The grey sand washes to white. There are pot-holes which have been filled with either a pudding or a breccia of quartz.
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