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M. velascoensis PRZ
1523
Type
Zone
Age range
55.9–55.5
Ma
International Timescale
Eocene
Ypresian
Planktic Foraminiferal Primary Biozones
A. sibaiyaensis LOZ
M. velascoensis PRZ
G. pseudomenardii TRZ
55.90
55.88
55.86
55.84
55.82
55.80
55.78
55.76
55.74
55.72
55.70
55.68
55.66
55.64
55.62
55.60
55.58
55.56
55.54
55.52
55.50
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