I think you should cut a slice, polish it up and mount it for posterity.
I cut down a spalted hackberry to find a prairie chicken... seems like there was a cartoon with a character like this.
What a hoot! I'd sure try to put that to use some way, other than in the fireplace! Can't tell the diameter from the pic, but if you coat it with AnchorSeal and let it dry very slowly, you might be able to make a small trivet or cheeseboard out of it.