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Precambrian[edit]
Side by side comparison{{Infobox geologic timespan}} | {{Infobox geologic timespan/sandbox}} |
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Hadean |
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| Artist illustration of Earth and the Moon towards the middle/end of the Hadean eon | |
−4500 — – — – −4000 — – — – −3500 — – — – −3000 — – — – −2500 — – — – −2000 — – — – −1500 — – — – −1000 — – — – −500 — – — – 0 — | | |
| Proposed subdivisions | See text
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Synonym(s) | Priscoan Period
Harland et al., 1989
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Celestial body | Earth |
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Regional usage | Global (ICS) |
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Chronological unit | Eon |
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Stratigraphic unit | Eonothem |
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First proposed by | Preston Cloud, 1972 |
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Time span formality | Informal |
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Upper boundary definition | Defined Chronometrically |
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Upper GSSA ratified | 1991 |
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Hadean |
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|
| Artist illustration of Earth and the Moon towards the middle/end of the Hadean eon | |
−4500 — – — – −4000 — – — – −3500 — – — – −3000 — – — – −2500 — – — – −2000 — – — – −1500 — – — – −1000 — – — – −500 — – — – 0 — | | |
| Proposed subdivisions | See text
|
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|
Synonym(s) | Priscoan Period
Harland et al., 1989
|
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|
Celestial body | Earth |
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Regional usage | Global (ICS) |
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|
Chronological unit | Eon |
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Stratigraphic unit | Eonothem |
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First proposed by | Preston Cloud, 1972 |
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Time span formality | Informal |
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Upper boundary definition | Defined Chronometrically |
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Upper GSSA ratified | 1991 |
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Cambrian[edit]
Paleocene[edit]
Cryogenian[edit]
Test without timeline
Side by side comparison{{Infobox geologic timespan}} | {{Infobox geologic timespan/sandbox}} |
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Cryogenian |
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Name formality | Formal |
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Name ratified | 1990 |
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Celestial body | Earth |
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Regional usage | Global (ICS) |
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Time scale(s) used | ICS Time Scale |
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Chronological unit | Period |
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Stratigraphic unit | System |
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Time span formality | Formal |
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Lower boundary definition | Defined chronometrically with an interim calibrated age of c. 720 Ma. GSSP is in progress. |
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Lower boundary definition candidates | The first appearance of widespread glaciation.[6] |
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Lower boundary GSSP candidate section(s) | To be determined |
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Upper boundary definition |
- Worldwide distinct cap carbonates.
- Beginning of a distinctive pattern of secular changes in carbon isotopes.
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Upper boundary GSSP | Enorama Creek section, Flinders Ranges, South Australia 31°19′53″S 138°38′00″E / 31.3314°S 138.6334°E / -31.3314; 138.6334 |
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Upper GSSP ratified | March 2004[7] |
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Mean atmospheric O2 content | c. 12 vol % (60 % of modern) |
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Mean atmospheric CO2 content | c. 1300 ppm (5 times pre-industrial) |
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Mean surface temperature | c. 5 °C (9 °C below modern) |
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Cryogenian |
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Name formality | Formal |
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Name ratified | 1990 |
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|
Celestial body | Earth |
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Regional usage | Global (ICS) |
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Time scale(s) used | ICS Time Scale |
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|
Chronological unit | Period |
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Stratigraphic unit | System |
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Time span formality | Formal |
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Lower boundary definition | Defined chronometrically with an interim calibrated age of c. 720 Ma. GSSP is in progress. |
---|
Lower boundary definition candidates | The first appearance of widespread glaciation.[6] |
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Lower boundary GSSP candidate section(s) | To be determined |
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Upper boundary definition |
- Worldwide distinct cap carbonates.
- Beginning of a distinctive pattern of secular changes in carbon isotopes.
|
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Upper boundary GSSP | Enorama Creek section, Flinders Ranges, South Australia 31°19′53″S 138°38′00″E / 31.3314°S 138.6334°E / -31.3314; 138.6334 |
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Upper GSSP ratified | March 2004[7] |
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Mean atmospheric O2 content | c. 12 vol % (60 % of modern) |
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Mean atmospheric CO2 content | c. 1300 ppm (5 times pre-industrial) |
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Mean surface temperature | c. 5 °C (9 °C below modern) |
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References[edit]