A fossil-integrated molecular-clock study preferred a tightly constrained Late Jurassic crown estimate, while alternative treatments of the same calibration densities produced much older intervals.
Represented range152.99–151.46 Ma
RegionsGlobal fossil and molecular sample
CladesCrown Angiospermae
Claim ledger
divergence-time · medium
A 2026 analysis used 25,685 non-pollen fossil occurrences to construct 110 calibration densities for a 644-species molecular tree; its preferred hard-bound strategy estimated crown Angiospermae at 152.99–151.46 Ma, while less constrained strategies yielded far older intervals, so the result is a calibration-dependent model rather than a fossil first appearance.