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Macrostrat
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Stylatractus universus
1629
Type
Zone
Age range
0.61–0.42
Ma
International Timescale
Pleistocene
Chibanian
Low Latitude Radiolarian Zonation
Collosphaera tuberosa
Stylatractus universus
Amphirhopalum ypsilon
0.61
0.60
0.59
0.58
0.57
0.56
0.55
0.54
0.53
0.52
0.51
0.50
0.49
0.48
0.47
0.46
0.45
0.44
0.43
0.42
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