Sorry spiral, there is no visible, photographable end grain. Not with the 16x magnification I have. There are a few small areas, that exhibit side grain like several known examples found here, and on line. Around the edges, there are some bug nips, and chips. The larger ones, have been filled with something. When touched with a hot pin, it smells like burning hair. So whatever it is, it's organic. The surface shows areas similar, to old cracked paint. I found a few photos on line, that were similar. Maybe, I can take it to the zoo, or college.
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