The timetree of life

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Proterozoic phytoplankton and timing of Chlorophyte algae origins (2011, background): “Radiometric ages of the strata in which the microfossils are found are compared to divergence times given by molecular clocks (Cavalier-Smith 2007; Hedges and Kumar 2009).”
Linking patterns in phylogeny, traits, abiotic variables and space: a novel approach to linking environmental filtering and plant community assembly (2011, methodology): “Branch lengths were estimated from a set of dated nodes (mostly from Hedges & Kumar 2009) and the bladj algorithm (Webb, Ackerly &Kembel 2008).”
MEGA5: molecular evolutionary genetics analysis using maximum likelihood, evolutionary distance, and maximum parsimony methods. (2011, methodology): “This master phylogeny was obtained by pruning taxa and groups from the tree of 1,671 families in the Timetree of Life (Hedges and Kumar 2009), such that the ﬁnal tree was strictly bifurcating.”