A brief summation of the points I've covered in the past few months regarding the Kensington Rune Stone:

1) HIstorically, we have evidence of a expedition returning from Greenland to Bergen in 1364. According to Cnoyen, this expedition included a priest from Oxford, thought to be Nicholas of Lynne. Fragmentary accounts of the expedition suggest that it proceeded along the Northeastern shores of Canada, possibly to the general vicinity of the magnetic pole, and may have reached Hudson Bay.
Certain maps, made
prior to Hudson's explorations and possibly based on the accounts of this journey, show a large bay on the north side of Canada. Although not conclusive, it does create the basis for a Norse presence in Hudson Bay at the same time as the date on the Kensington Rune Stone. The number of recorded survivors of the expedition (8) also falls within the limits of the number of men the Stone records as having been left with the boats (10). This information would not have been known in the 19th century except to a diligent scholar with a knowledge of Latin.

2) Winchell's notebook shows that he spent considerable time investigating Holland, and that he was not in Holland's pocket as some have suggested. No doubt Holland did exert considerable influence on the preliminary report, as he must have been considered an expert on the stone - this would most likely have been in the area of the linguistics, particularly in answering the objection of Flom.
It can also be seen in the report that Winchell allows room for error in his judgments, and does not seem to allow any personal beliefs to influence his professional judgments.

3) Those persons who best knew Olof Ohman considered him to be a very honest and open man, including such original critics of the stone as Breda and Curme. It is only when distanced by location or time that rumors about him began to develop. And it was only after his death that any attack on his character occurred, or that any concentrated effort to try and link him with a forgery of the stone began. As Breda concluded "I have never seen any reason to connect Mr. Ohman... with the forgery in any way".

4) Two people were present when the inscription on the stone was discovered (Olof and Edward Ohman) and the stone was still in the roots of the tree, and Nils Flaaten was there almost immediately afterwards. Unless all three were lying, the stone was found quite firmly gripped by the roots of the tree in such a fashion the the stone was pulled up by the tree and needed to be cut away from the roots. This suggests that the stone must have been beneath the tree for quite some time.

5) A flattening on the roots of the tree where it was in contact with the stone were noticed by many, again pointing to a long stay beneath the tree. One root, estimated to be three inches thick, some few inches below the ground, followed the width of the stone before heading downward into the soil. In order for such a thing to occur, the stone must have been beneath the root for the length of the roots growth, that is roughly the age of the tree.

6) The exact age of the tree is not known, but cuttings from other trees in the area of similar size to the tree give an approximate age of 40 years. It should be noted that the tree was thought to be rather small for its age, and that it was in a clay like soil and on the side of a hill which were not optimum growing conditions.

7) The calcite disintegration on the stone shows that it must have been exposed to the weather for a number of years. This severely undercuts any such theory as would have a hoaxer remove the stone, inscribe it and rebury it, as it would not have had time to undergo the weathering necessary.

8) It is reasonable to conclude from this evidence that the inscribed stone lay undisturbed beneath the tree for a period of roughly 40 years, or at least back to 1860. The white population of Douglas county at that time was 164.

9) It was noted by those who first examined the stone (including those at Northwestern University) that the coloration of the inscription where not scraped away was the same as on the rest of the stone. It is since been noted (based on a mark placed on the stone in 1909) that it would take approximately 70 - 80 years for the inscription to acquire such a patina.

10) The physical clarity of the inscription should not be considered as odd given the nature of the stone it was inscribed upon. This can be shown by the 'freshness' of the glacial striations on the back of the stone, which would be approximately 8,000 years old.

11) Winchell estimates the age of the inscription as about 500 years old. Indeed none of the geologists who examined the stone in 1910 suggested that the inscription could not be of that age, and the minimum age of the inscription was given at 50 years. This would at the very least place the time of the inscription as prior to 1860.

CONCLUSION:
There is very strong physical evidence from the patina, the
weathering, and the tree roots that the inscription on the stone could not have been made any later than 1860. To the extent of my knowledge there is no evidence to the contrary. If we assume that date, the possibility of the inscription being a hoax is diminshingly small. I shall attempt to show, in further arguments, that the inscription was of such a complexity that although recent research validates the inscription, such knowledge would have been beyond the reach of 19th century scholars.