A combined plastome, fossil and tectonic calibration scheme yielded mean crown-age estimates of 69.31 and 42.88 Ma under different tree priors, without converting either model result into a fossil range.
Represented range69.31–42.88 Ma
RegionsGlobal Cycas plastome sample with Palawan calibration
CladesExtant Cycadaceae · Cycas
Claim ledger
divergence-time · medium
Under a calibration scheme combining a Cycas fossil, Palawan tectonic history and plastome data, different tree priors yielded mean crown ages of extant Cycadaceae of approximately 69.31 and 42.88 Ma; this Palaeogene-to-Late-Cretaceous model result is not a fossil first appearance for Cycadaceae or an age for all cycads.