Cambrian
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Cambrian Period යනු Paleozoic යුගයේ පළමු කාලපරිච්ඡේදය, එනම් වසර මිලියන 539-485 කට පෙර යුගය වේ.
Quick Facts Chronology, Etymology ...
Cambrian | |
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538.8 ± 0.2 – 485.4 ± 1.9 Ma | |
Chronology | |
සැකිල්ල:Cambrian graphical timeline | |
Etymology | |
Name formality | Formal |
Usage information | |
Celestial body | Earth |
Regional usage | Global (ICS) |
Time scale(s) used | ICS Time Scale |
Definition | |
Chronological unit | Period |
Stratigraphic unit | System |
First proposed by | Adam Sedgwick, 1835 |
Time span formality | Formal |
Lower boundary definition | Appearance of the Ichnofossil Treptichnus pedum |
Lower boundary GSSP | Fortune Head section, Newfoundland, Canada 47.0762°N 55.8310°W / 47.0762; -55.8310 |
GSSP ratified | 1992[1] |
Upper boundary definition | FAD of the Conodont Iapetognathus fluctivagus. |
Upper boundary GSSP | Greenpoint section, Green Point, Newfoundland, Canada 49.6829°N 57.9653°W / 49.6829; -57.9653 |
GSSP ratified | 2000[2] |
Atmospheric and climatic data | |
Sea level above present day | Rising steadily from 4 m to 90 m[3] |
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