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Intervals
Macrostrat
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Chadronian
412
Type
Age
Age range
37.71–33.9
Ma
International Timescale
Oligocene
Rupelian
Eocene
Priabonian
Bartonian
North American Land Mammal Ages
Orellan
Chadronian
Duchesnean
North American Regional
Orellan
Chadronian
Duchesnean
37.8
37.6
37.4
37.2
37.0
36.8
36.6
36.4
36.2
36.0
35.8
35.6
35.4
35.2
35.0
34.8
34.6
34.4
34.2
34.0
33.8
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