Lexicon
Intervals
Macrostrat
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Bortonian
384
Type
Age
Age range
42.6–39.1
Ma
International Timescale
Eocene
Bartonian
Lutetian
New Zealand Ages
Kaiatan
Bortonian
Porangan
42.6
42.4
42.2
42.0
41.8
41.6
41.4
41.2
41.0
40.8
40.6
40.4
40.2
40.0
39.8
39.6
39.4
39.2
39.0
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