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Calocycletta costata
1640
Type
Zone
Age range
17.03–15.68
Ma
International Timescale
Miocene
Langhian
Burdigalian
Low Latitude Radiolarian Zonation
Dorcadospyris alata
Calocycletta costata
Stichocorys wolffi
17.0
16.9
16.8
16.7
16.6
16.5
16.4
16.3
16.2
16.1
16.0
15.9
15.8
15.7
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