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Tropites welleri
777
Type
Zone
Age range
232.6–229.7
Ma
International Timescale
Late Triassic
Carnian
Ammonite Zonation - Boreal
Klamathites macrolobatus
Tropites welleri
Tropites dilleri
232.6
232.4
232.2
232.0
231.8
231.6
231.4
231.2
231.0
230.8
230.6
230.4
230.2
230.0
229.8
229.6
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