Devonian යනු වසර මිලියන 419-359 කට පෙර, එනම් Paleozoic යුගයේ සිව්වන කාලපරිච්ඡේදය වේ.

Devonian
419.2 ± 3.2 – 358.9 ± 0.4 Ma
Late Devonian world map
Chronology
Etymology
Name formalityFormal
Nickname(s)Age of Fishes
Usage information
Celestial bodyEarth
Regional usageGlobal (ICS)
Time scale(s) usedICS Time Scale
Definition
Chronological unitPeriod
Stratigraphic unitSystem
Time span formalityFormal
Lower boundary definitionFAD of the Graptolite Monograptus uniformis
Lower boundary GSSPKlonk, Czech Republic
49°51′18″N 13°47′31″E / 49.8550°N 13.7920°E / 49.8550; 13.7920
GSSP ratified1972[1]
Upper boundary definitionFAD of the Conodont Siphonodella sulcata (discovered to have biostratigraphic issues as of 2006).[2]
Upper boundary GSSPLa Serre, Montagne Noire, France
43°33′20″N 3°21′26″E / 43.5555°N 3.3573°E / 43.5555; 3.3573
GSSP ratified1990[3]
Atmospheric and climatic data
Sea level above present dayRelatively steady around 189 m, gradually falling to 120 m through period[4]

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  • [[::Category:Devonian plants|:Category:Devonian plants]]

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  1. ^ Chlupáč, Ivo; Hladil, Jindrich (January 2000). "The global stratotype section and point of the Silurian-Devonian boundary". CFS Courier Forschungsinstitut Senckenberg: 1–8. සම්ප්‍රවේශය 7 December 2020.
  2. ^ Kaiser, Sandra (1 April 2009). "The Devonian/Carboniferous boundary stratotype section (La Serre, France) revisited". Newsletters on Stratigraphy. 43 (2): 195–205. doi:10.1127/0078-0421/2009/0043-0195. සම්ප්‍රවේශය 7 December 2020.
  3. ^ Paproth, Eva; Feist, Raimund; Flajs, Gerd (December 1991). "Decision on the Devonian-Carboniferous boundary stratotype" (PDF). Episodes. 14 (4): 331–336. doi:10.18814/epiiugs/1991/v14i4/004.
  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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