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ammonites(9)
ammonite(7)
ammonoidea(3)
carbon isotope(3)
cretaceous(3)
extinction(3)
mass extinction(3)
paleoenvironment(3)
belemnites(2)
biostratigraphy(2)
conodont(2)
diversity(2)
environmental change(2)
lower jurassic(2)
permian-triassic boundary(2)
taphonomy(2)
toarcian(2)
δ13c(2)
ammonite record(1)
ammonite zones(1)
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