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Michigan's UP ISLE ROYAL
To this will have to be added the number of years which a tree with the durability of the wood of this species takes to reach the stage of decay here exhibited; and some years may also be allowed for the time which may have elapsed before it commenced growing on its peculiar site. So that the placing this period at from 700 to 800 years, as already given, may not be far from the truth. But it must be remembered that this does not prevent the period of the desertion of the works being placed back at twice or even three times that distance. In other words it only proves that the pits had not been worked within the time mentioned. On removing this stump the debris underlying it was found
to consist of the usual angular fragments of copper-bearing rock, thrown out from the adjoining pit, and with which were intermingled a large number of stone-hammers, some perfect, others fractured from use, and, 'more interesting still, a knife made of copper. Pine trees {pinus strobus) of the present forest, in which 380 annual rings have been counted, have frequently been cut on the tumuli.
Upper Penisula
Page 11
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