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Silurian යනු වසර මිලියන 444-419 කට පෙර Paleozoic යුගයේ තුන්වන කාලය වේ.
Silurian | |
---|---|
Chronology | |
සැකිල්ල:Silurian graphical timeline | |
Etymology | |
Name formality | Formal |
Synonym(s) | Gotlandian |
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 | Roderick Murchison, 1835 |
Time span formality | Formal |
Lower boundary definition | FAD of the Graptolite Akidograptus ascensus |
Lower boundary GSSP | Dob's Linn, Moffat, UK 55.4400°N 3.2700°W |
GSSP ratified | 1984[1][2] |
Upper boundary definition | FAD of the Graptolite Monograptus uniformis |
Upper boundary GSSP | Klonk, Czech Republic 49.8550°N 13.7920°E |
GSSP ratified | 1972[3] |
Atmospheric and climatic data | |
Sea level above present day | Around 180m, with short-term negative excursions[4] |
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