|
gptkb:Permian-Triassic
|
first appearance of conodont Hindeodus parvus
|
|
gptkb:Eocene–Oligocene_transition
|
first appearance of the foraminiferan Hantkenina extinction
|
|
gptkb:Permian/Triassic_boundary_at_Meishan,_China
|
first appearance of conodont Hindeodus parvus
|
|
gptkb:Carboniferous
|
appearance of conodont Siphonodella sulcata
|
|
gptkb:Permian–Triassic
|
extinction horizon in marine strata
|
|
gptkb:Newfoundland_and_Labrador–Quebec_border
|
1927 Privy Council decision
|
|
gptkb:Eocene_epoch
|
first appearance of the foraminiferan Hantkenina
|
|
gptkb:Permian–Triassic
|
first appearance of conodont Hindeodus parvus
|
|
gptkb:Carboniferous
|
disappearance of fusulinid Pseudoschwagerina
|
|
gptkb:Maastrichtian
|
first appearance of ammonite Pachydiscus neubergicus
|
|
gptkb:Strömgren_sphere
|
balance between ionization and recombination
|