trunk cross section of a 70 year old douglas fir, pseudotsuga menziesii,

annual background bark certified clear clearly color council cracks cross cut dark douglas example fir forest forestry fsc grown growth hallmark harvest healthy labeled light log logs lumber management material menziesii natural nature numbered old pattern product production pseudotsuga ready ring rings section shrinkage species stacked stewardship stump sustainable sustainably texture this timber transport tree trunk typical visible wood wooden year