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Thyrsocyrtis triacantha
1654
Type
Zone
Age range
47.5–44.5
Ma
International Timescale
Eocene
Lutetian
Low Latitude Radiolarian Zonation
Podocyrtis ampla
Thyrsocyrtis triacantha
Dictyoprora mongolfieri
47.6
47.4
47.2
47.0
46.8
46.6
46.4
46.2
46.0
45.8
45.6
45.4
45.2
45.0
44.8
44.6
44.4
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