Keep this discussion on topic or you will be banned. I believe this is the third time I've had to warn about this.
You should probably move this thread to the proper forum then as it has absolutely nothing to do with fe theory.
It is a major contribution to FE canon and has substantial explanatory power with regard to issues in zetetic geology and geography. As a fervent globularist I would not expect you to understand its merit.
Vegetation fossils aren't exactly hard to come by, so why haven't we found any that resemble boats or rafts.
It's hardly surprising if you consider the ratio of plants found to plants which existed. There would have to have been a staggeringly large number of boats in order for it to be statistically probable that one would be found. Current evidence is not anomalous in light of the approximate proportions of fossils found to fossilisable artifacts which were produced.
However, that's not to say the boats aren't out there. I personally think we should be looking for them much harder than we currently are.