Geological time scale and its naming history
Geological Time Scale
Eon(宙)-Era(代)-Period(纪)-Epoch(世)-age(期)
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Naming History
- Cambrian - The Latin name of Wales
- Ordovician: a Welsh tribe, Ordovices
- Silurian - another tribe of Wales, Silures
- Devonian - Name after the Devon County, the era of fish
- Carboniferous - “coal-bearing”
- Cretaceous - Chalk (Latin: Creta)
Life evolution and important climate events
- LUCA 3.5-3.8 Ga (Procaryote)
- GOE: 2.4-2.0 Ga
- Eucaryote: 2.2 Ga
- Snowball Earth: (2.4 Ga after the GOE; 0.75 to 0.635 Ga)
- Multicelluar organism: 1.4 Ga (diverse cells start to emerge)
- Ediacaran biota: 0.68 Ga (after the second Snowball Earth)
- The first metazoan (Saccorhytus) and the first vertebate (昆明鱼和云南虫)