title: Constraining fossil calibrations for molecular clocks.
authors.forename: S Blair
authors.initials: SB
authors.lastname: Hedges
authors.forename: Sudhir
authors.initials: S
authors.lastname: Kumar
authors.forename: Marcel
authors.initials: M
authors.lastname: van Tuinen
mesh_terms: D000818:Animals; D002138:Calibration; D019143:Evolution, Molecular; D005580:Fossils; D013997:Time Factors