crossection of a one inch juniper growing from rock in the shade

This crossection illustrates the compactness of the tree rings on this one inch wide tree which grew from bare rock in the shade.
Both false rings and missing rings can be seen.  The pencil point lead in the top of the photo is about a milimeter wide.
 Each pencil mark on the line drawn is about five years of growth.  Visually, false rings and annual rings are more readily
identifiable than on this limited resolution photo.