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Michigan's UP ISLE ROYAL
At two places at each end of the circular pits, the copper veins in the wall-like cliff had been attacked and partly excavated. The rock was disclosed, as if from the action of fire, and at the base of the more central point the sandstone is considerably hollowed. All those works exhibited the same roughish surface, totally unlike that produced by the action of water.
Immediately at the end of the southern landing, already described, is a marked depression, occupying nearly the centre of the island, and presenting some indications of artificial origin. But about 35 feet northwestward of the head of the landing occurs a more remarkable excavation. This is of rectangular form, 25 feet long by 20 feet wide. It is filled with water, as are most of the pits.
It may not be uninteresting to state in this connection that I found the rare fern Botrychium lunaria (Swartz) flourishing and rather abundant on the exposed rock of this island. It grows in tufts of Potentilla triderdata (Ait.) grass, and other dwarf plants.
Upper Penisula
Page 19
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