Definition of Acastan. Meaning of Acastan. Synonyms of Acastan

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Definition of Acastan

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Meaning of Acastan from wikipedia

- Archean Eon/Eonothem (4030–2420 Ma) Paleoarchean Era/Erathem (4030–3490 Ma) Acastan Period/System (4030–3810 Ma) – named after the Acasta Gneiss, one of the...
- before 3.8 billion years ago.[needs update?] Eoarchean Era — 4031–3600 Mya Acastan Period — 4031–3810 Mya Isuan Period — 3810–3600 Mya Precambrian Supereon...
- redefinition(s) 4031–3490 Ma Gradstein et al., 2012 Proposed subdivisions Acastan Period, 4031–3810 Ma Gradstein et al., 2012 Isuan Period, 3810–3490 Ma...