Luo, Z.-X.; Yuan, C.-X.; Meng, Q.-J.; Ji, Q.
taxonomy · range · morphology · topology · geochronology
Primary description and original Tiaojishan provenance and topology for BMNH PM1343B; those assignments are not converted into a universal calibration.
BMNH PM1343B preserves a partial articulated skeleton whose original study attributed it to approximately 160-million-year-old Tiaojishan strata and recovered a basal eutherian position; provenance, age use and topology remain conditional, and an unconstrained tip-dating analysis instead estimated an Early Cretaceous morphological age signal.
claim:event:juramaia-conditional-provenanceJuramaia sinensis is bounded conditionally by holotype BMNH PM1343B and its original approximately 161–159 Ma Tiaojishan attribution; uncertain collection provenance and a younger tip-dating signal prevent treating that interval as a secure global first appearance or calibration.
claim:taxon:juramaia:fossil-rangeTherian boundary evidence is an atlas navigation route spanning separately sampled Juramaia, Eomaia and Ambolestes records from approximately 161–124.1 Ma; it is not a taxonomic clade, continuous lineage or ancestor sequence, and its older endpoint inherits the disputed Juramaia provenance.
claim:taxon:therian-boundary-evidence:route-boundary