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This pattern of growth results in alternating bands of light-colored, low density "early wood" and dark, high density "late wood".Each dark band represents a winter; by counting rings it is possible to find the age of the tree (Figure 11.22).Because these units are used according to the rules of the metric system, the M in Ma and the G in Ga must be capitalized, and the k in ka must not be capitalized.
When you see the drawing in juxtaposition to the photograph, it is obvious they do not match perfectly.
By using the principles of relative geologic age, the sequence of geologic events -- what happened first, what happened next, what happened last -- can be established.
Absolute geologic age refers to how long ago a geologic event occurred or a rock formed, in numeric terms, such as 65.5 million years ago.
The amount of deformation can normally be measured with greater accuracy than the age.
Adequate age control is thus a limiting factor in studies of active tectonism.