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Silurian

විකිපීඩියා වෙතින්
Silurian
443.8 ± 1.5 – 419.2 ± 3.2 Ma
Plate tectonics of Earth during the early Silurian
Chronology
Etymology
Name formalityFormal
Synonym(s)Gotlandian
Usage information
Celestial bodyEarth
Regional usageGlobal (ICS)
Time scale(s) usedICS Time Scale
Definition
Chronological unitPeriod
Stratigraphic unitSystem
First proposed byRoderick Murchison, 1835
Time span formalityFormal
Lower boundary definitionFAD of the Graptolite Akidograptus ascensus
Lower boundary GSSPDob's Linn, Moffat, UK
55°26′24″N 3°16′12″W / 55.4400°N 3.2700°W / 55.4400; -3.2700
GSSP ratified1984[1][2]
Upper boundary definitionFAD of the Graptolite Monograptus uniformis
Upper boundary GSSPKlonk, Czech Republic
49°51′18″N 13°47′31″E / 49.8550°N 13.7920°E / 49.8550; 13.7920
GSSP ratified1972[3]
Atmospheric and climatic data
Sea level above present dayAround 180m, with short-term negative excursions[4]

Silurian යනු වසර මිලියන 444-419 කට පෙර Paleozoic යුගයේ තුන්වන කාලය වේ.

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  1. ^ 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.
  2. ^ 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.
  3. ^ 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.
  4. ^ 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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