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Intervals
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NP12
311
Type
Zone
Age range
52.93–50.65
Ma
International Timescale
Eocene
Ypresian
Calcareous Nannoplankton Zones
NP13
NP12
NP11
53.0
52.9
52.8
52.7
52.6
52.5
52.4
52.3
52.2
52.1
52.0
51.9
51.8
51.7
51.6
51.5
51.4
51.3
51.2
51.1
51.0
50.9
50.8
50.7
50.6
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