Absolute time, Biology

Absolute time is one of the two types of geologic time (relative time being the other), with the distinct age date established generally by the decay of the radioactive elements, though ages might also be attained by counting tree rings, decay of the specific type of atom, or an annual sedimentary layers (like varves in lakes or layers in the glacier). The term is in some disfavor because it suggests an exactness which might not be possible to obtain.

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