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