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Pterocanium prismetium
1632
Type
Zone
Age range
2.74–1.74
Ma
International Timescale
Pleistocene
Calabrian
Gelasian
Pliocene
Piacenzian
Low Latitude Radiolarian Zonation
Anthocyrtidium angulare
Pterocanium prismetium
Lychnodictyum audax
2.8
2.7
2.6
2.6
2.5
2.5
2.5
2.4
2.4
2.3
2.3
2.2
2.1
2.1
2.0
2.0
1.9
1.9
1.9
1.8
1.8
1.7
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