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Intervals
Macrostrat
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Hadrynian
203
Type
Period
Age range
850–538.8
Ma
International Timescale
Paleozoic
Cambrian
Terreneuvian
Neoproterozoic
Ediacaran
Cryogenian
Tonian
North American Regional
Begadean
Hadrynian
860
840
820
800
780
760
740
720
700
680
660
640
620
600
580
560
540
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