Silurian
Silurian යනු වසර මිලියන 444-419 කට පෙර Paleozoic යුගයේ තුන්වන කාලය වේ.
| Silurian | |
|---|---|
 Plate tectonics of Earth during the early Silurian | |
| Chronology | |
| 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°26′24″N 3°16′12″W / 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°51′18″N 13°47′31″E / 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] |
සටහන්
සංස්කරණය- ^ Lucas, Sepncer (6 November 2018). "The GSSP Method of Chronostratigraphy: A Critical Review". Frontiers in Earth Science. 6: 191. Bibcode:2018FrEaS...6..191L. doi:10.3389/feart.2018.00191.
- ^ Holland, C. (June 1985). "Series and Stages of the Silurian System" (PDF). Episodes. 8 (2): 101–103. doi:10.18814/epiiugs/1985/v8i2/005. සම්ප්රවේශය 11 December 2020.
- ^ Chlupáč, Ivo; Hladil, Jindrich (January 2000). "The global stratotype section and point of the Silurian-Devonian boundary". CFS Courier Forschungsinstitut Senckenberg. සම්ප්රවේශය 7 December 2020.
- ^ Haq, B. U.; Schutter, SR (2008). "A Chronology of Paleozoic Sea-Level Changes". Science. 322 (5898): 64–68. Bibcode:2008Sci...322...64H. doi:10.1126/science.1161648. PMID 18832639. S2CID 206514545.
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Wikisource has original works on the topic: Paleozoic#Silurian
Silurian හා සබැඳි මාධ්ය විකිමාධ්ය කොමන්ස් හි ඇත.
- Ogg, Jim (June 2004), Overview of Global Boundary Stratotype Sections and Points (GSSP's)
- Palaeos: Silurian
- UCMP Berkeley: The Silurian
- Paleoportal: Silurian strata in U.S., state by state සංරක්ෂණය කළ පිටපත 2021-03-15 at the Wayback Machine
- USGS:Silurian and Devonian Rocks (U.S.)
- "International Commission on Stratigraphy (ICS)". Geologic Time Scale 2004. සම්ප්රවේශය September 19, 2005.
- Examples of Silurian Fossils
- GeoWhen Database for the Silurian
- Silurian (Chronostratography scale)