Fig. 4

Ginkgo secondary calibration extracted from the gymnosperm-wide divergence time estimation. a Age distribution from the four different combinations of tree model and topology. Ginkgo crown age and the two oldest splits within the species (TM12/TM22 and TM12/ES10) were used for calibration. Displayed are combinations of all four runs for each respective parameter set, excluding burn-in. b Magnification of the Ginkgo intrageneric nodes from Fig. 3. Upper and lower 95% HPD limits are given. Red stars denote nodes used for secondary calibration in the Ginkgo only analysis (Fig. 5)