Silurian

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

Silurian
443.8 ± 1.5 – 419.2 ± 3.2 Ma PreЄ Є O S D C P T J K Pg N
Plate tectonics of Earth during the early 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°26′24″N 3°16′12″W / 55.4400°N 3.2700°W / 55.4400; -3.2700
GSSP ratified	1984
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 / 49.8550; 13.7920
GSSP ratified	1972
Atmospheric and climatic data
Sea level above present day	Around 180m, with short-term negative excursions

සටහන්

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.