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Intervals
Macrostrat
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O. beckmanni TRZ
1535
Type
Zone
Age range
40.8–40
Ma
International Timescale
Eocene
Bartonian
Planktic Foraminiferal Primary Biozones
M. crassatus HOZ
O. beckmanni TRZ
M. lehneri PRZ
Planktic Foraminiferal Secondary Biozones
M. crassatus HOZ
O. beckmanni TRZ
40.8
40.8
40.7
40.6
40.6
40.5
40.5
40.5
40.4
40.4
40.3
40.3
40.2
40.1
40.1
40.0
40.0
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