Lexicon
Intervals
Macrostrat
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Arikareean
515
Type
Age
Age range
29.8–18.6
Ma
International Timescale
Miocene
Burdigalian
Aquitanian
Oligocene
Chattian
Rupelian
North American Land Mammal Ages
Hemingfordian
Arikareean
Whitneyan
North American Regional
Hemingfordian
Arikareean
Whitneyan
30
30
29
29
28
28
27
27
26
26
25
25
24
24
23
23
22
22
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21
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19
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