Heartwood
When trees sustain an injury, they are unable to repair or heal the injury. Instead they grow new tissue around the wound site and isolate it. This looks like an oak tree, maybe 80 or so years old. I took this at C&N Sawmill in Marshall.

This entry was posted
on Sunday, April 12th, 2009 at 6:47 pm and is filed under Woodworks and tagged with Photography, Tree, Wood.
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Great description | great photo
Thanks. It wasn’t very long ago that I learned that about trees. It was really surprising.