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Michigan's UP ISLE ROYAL
I cannot but conclude that since the last work was done on those pits several generations of trees have arisen and disappeared. The remains of trees older by hundreds of years than the oldest of our present timber are found in and on the sides of the pits. The present growth of forest covers, unbroken, those excavations and the debris surrounding them; all the timber now growing on them being of the same character as that covering the adjacent land, and which is now in process of supplanting by what is known as our " second growth." The late General Harrison, President of the United States, acknowledged to have been remarkably skilled in woodcraft as well as in warfare, in his notes on the Ohio mounds, has made some valuable and suggestive remarks on the relation observed by the different species of forest growth. Lyell, in his "Antiquity of Man," quotes the passage with further and approving remarks.
Upper Penisula
Page 9
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