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Cahabagnathus sweeti
554
Type
Zone
Age range
461.2–456.6
Ma
International Timescale
Late Ordovician
Sandbian
Middle Ordovician
Darriwilian
Conodont Zonation
Plectodina aculeata
Cahabagnathus sweeti
Cahabagnathus friendsvillensis
461.4
461.2
461.0
460.8
460.6
460.4
460.2
460.0
459.8
459.6
459.4
459.2
459.0
458.8
458.6
458.4
458.2
458.0
457.8
457.6
457.4
457.2
457.0
456.8
456.6
456.4
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