Permian-Triassic boundary  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Triassic
 ....Lower Triassic
 .....Permian-Triassic boundary
BTstratigraphic boundary
 .Permian-Triassic boundary
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Permian
 ....Upper Permian
 .....Permian-Triassic boundary
UFP-T boundary (age)
 P/T boundary (age)
RTKarroo Supergroup
 Beacon Supergroup
 Baskunchak Series
 Beaufort Group
 Botucatu Formation
 Estrada Nova Formation
 Cache Creek Group
 Chugwater Formation
 Korenevskaya Formation
 Eagle Mills Formation
 Gondwana System
 Goose Egg Formation
 Ivishak Formation
 Louann
SNBefore 1998, also search Permian-Triassic; (Permian AND Triassic AND (stratigraphic boundary or boundary)). This term has multiple hierarchies. Added to Thesaurus in 1998.