References / paperThe earliest seeds
Gillespie, W.H.; Rothwell, G.W.; Scheckler, S.E.
Year1981
Source roleprimary-study
DOI / ID10.1038/293462a0
Fitness and scope
taxonomy · range · morphology
Famennian cupule systems from the Hampshire Formation contain lagenostomalean-type seeds; the record anchors early total-group seed plants, not the crown age of living gymnosperms.
Claim ledger
fossil-range · mediumThe Gymnospermae atlas root uses a rounded 365–0 Ma total-seed-plant navigation envelope, anchored by Famennian cupulate seeds and living gymnosperm families; it is not the fossil first appearance or crown age of extant Gymnospermae.
claim:taxon:gymnospermae:root-range-rc39