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P. wilcoxensis/M. velascoensis CRZ
1525
Type
Zone
Age range
55.4–54.5
Ma
International Timescale
Eocene
Ypresian
Planktic Foraminiferal Primary Biozones
M. marginodentata PRZ
P. wilcoxensis/M. velascoensis CRZ
A. sibaiyaensis LOZ
55.4
55.4
55.3
55.3
55.2
55.1
55.1
55.0
55.0
55.0
54.9
54.9
54.8
54.8
54.7
54.6
54.6
54.5
54.5
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