In small Oaks I have seen a cone of rot at ground level. It usually doesn't go up as high as normal stump cut height. If it does it usually is small diameter.
I have seen Oak grain spiral, but the bark has always given that fact away. Doesn't appear on Gary's tree. I agree with Al that White Oaks that size aren't known to be hollow. Could it be because it is split that it doesn't thump solid?
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