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ds of fresh-water shells, apparently formed since the deluge, but when the waters were still of a vast depth and extent, are found in the east of Lake Huron. Little or nothing is known of the dreary solitudes beyond Lake Superior; enormous muddy ponds and marshes are succeeded by open, dry, sandy plains; then forests of hemlock and spruce arise, again swamp, bog, windfalls, and stagnant water succeed; in the course of many miles there may not be one dry spot found for a resting-place. The cold is intense in this desolate region; in winter spirits freeze into a consistency like honey; and even in the height of summer the thermometer only shows thirty-six degrees at sunrise. Part of the north and east shore of this greatest of the lakes present old formations--sienite, stratified greenstone, more or less chloritic, and alternating five times with vast beds of granite--the general direction east, with a north or perpendicular dip. Great quantities of the older shell limestone are found strewn in rolled masses on the beach. Amygdaloid occupies also a very large tract to the north, mingled with porphyries, conglomerates, and various other substances. From Thunder Mountain westward, trappose greenstone is the prevailing rock: it gives rise to some strange pilastered precipices near Fort William. Copper[155] abounds in this region to an extent, perhaps, unsurpassed any where in the world. At the Coppermine River, three hundred miles from the Sault de St. Marie, this metal, in a pure state, nearly covers the face of a serpentine rock, and is also found within the stone in solid masses. Iron is abundant in many parts of Upper Canada; at Charlotteville, eight miles from Lake Erie, the metal produced is of a very fine quality. The Marmora Iron Works, about thirty-two miles north of the Bay of Quinte, on the River Trent, are situated on an extensive white rocky flat, apparently the bed of some dried-up river; the ore is found on the surface, and is very rich, yielding ninety-two per cent.: the necessary assistants, lime and fuel, abound close at hand. Various other minerals have also been found there; among the rest, small specimens of a metal like silver. There are many strong mineral springs in different parts of Canada; the most remarkable of these is the Burning Spring above Niagara; its waters are black, hot and bubbling, and emit, during the summer, a gas that burns with a pure bright flame; this sulphureted hydrogen is us
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