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Macrostrat
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G. semiinvoluta HOZ
1537
Type
Zone
Age range
38.1–35.8
Ma
International Timescale
Eocene
Priabonian
Bartonian
Planktic Foraminiferal Primary Biozones
G. index HOZ
G. semiinvoluta HOZ
M. crassatus HOZ
Planktic Foraminiferal Secondary Biozones
G. index HOZ
G. semiinvoluta HOZ
M. crassatus HOZ
38.2
38.1
38.0
37.9
37.8
37.7
37.6
37.5
37.4
37.3
37.2
37.1
37.0
36.9
36.8
36.7
36.6
36.5
36.4
36.3
36.2
36.1
36.0
35.9
35.8
35.7
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