I wonder if this is a difference from where along the shaft the cross-section is taken, or if it's just the individual variation?
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The thing that's extra interesting to me about that cross-section is that the pattern is pretty clearly a two-point sourced wave propagation interference pattern.
Well, I'm not willing to say that's what it is mathematically (math is hard, let's go shopping for razors!), but from a visual representation standpoint, it's a very familiar noise pattern for me.
If I remember correctly the way to tell Elephant from say Mammoth is the angle that the lines cross at.
"Bone is much more porous than ivory." And they said the information learned on 'Pawn Stars' was useless. Lol.