Article
Calibration of avian molecular clocks.
Molecular biology and evolution - 1 Feb 2001
van Tuinen M, Hedges S B
Abstract excerpt
Molecular clocks can be calibrated using fossils within the group under study (internal calibration) or outside of the group (external calibration). Both types of calibration have their advantages and disadvantages. An internal calibration may reduce extrapolation error but may not be from the best fossil record, raising the issue of nonindependence. An external calibration may be more independent but also may...
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