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A. sibaiyaensis LOZ
1524
Type
Zone
Age range
55.5–55.4
Ma
International Timescale
Eocene
Ypresian
Planktic Foraminiferal Primary Biozones
P. wilcoxensis/M. velascoensis CRZ
A. sibaiyaensis LOZ
M. velascoensis PRZ
55.50
55.49
55.49
55.48
55.48
55.48
55.47
55.47
55.46
55.45
55.45
55.45
55.44
55.44
55.43
55.42
55.42
55.41
55.41
55.41
55.40
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