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M. crassatus HOZ
1536
Type
Zone
Age range
40–38.1
Ma
International Timescale
Eocene
Bartonian
Planktic Foraminiferal Primary Biozones
G. semiinvoluta HOZ
M. crassatus HOZ
O. beckmanni TRZ
Planktic Foraminiferal Secondary Biozones
G. semiinvoluta HOZ
M. crassatus HOZ
O. beckmanni TRZ
40.0
39.9
39.8
39.7
39.6
39.5
39.4
39.3
39.2
39.1
39.0
38.9
38.8
38.7
38.6
38.5
38.4
38.3
38.2
38.1
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