Silurian

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Silurian Period
443.4–419.2 million years ago
Mean atmospheric O
2
content ower period duration
c. 14 vol %[1][2]
(70 % of modern level)
Mean atmospheric CO
2
content ower period duration
c. 4500 ppm[3][4]
(16 times pre-industrial level)
Mean surface temperature ower period duration c. 17 °C[5][6]
(3 °C above modern level)
Sea level (abuin present day) Aroond 180 m, wi short-term negative excursions[7]
Key events in the Silurian
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-444 —
-442 —
-440 —
-438 —
-436 —
-434 —
-432 —
-430 —
-428 —
-426 —
-424 —
-422 —
-420 —
-418 —
Key events of the Silurian Period.
Axis scale: millions of years ago.

The Silurian, accordin tae scientists, is a geologic period an seestem spannin 24.6 million years frae the end o the Ordovician Period, at 443.4 million years ago (Mya), tae the beginnin o the Devonian Period, 419.2 Mya.[10]

References[eedit | eedit soorce]

  1. Image:Sauerstoffgehalt-1000mj.svg
  2. Image:OxygenLevelsThroughEarthHistory.png
  3. Image:Phanerozoic Carbon Dioxide.png
  4. Image:CO2LevelsThroughEarthHistory.png
  5. Image:All palaeotemps.png
  6. Image:TemperatureLevelsOverEarthHistory.png
  7. Haq, B. U.; Schutter, SR (2008). "A Chronology of Paleozoic Sea-Level Changes". Science. 322 (5898): 64–68. Bibcode:2008Sci...322...64H. PMID 18832639. doi:10.1126/science.1161648. 
  8. Jeppsson, L.; Calner, M. (2007). "The Silurian Mulde Event and a scenario for secundo—secundo events". Earth and Environmental Science Transactions of the Royal Society of Edinburgh. 93 (02): 135–154. doi:10.1017/S0263593300000377. 
  9. Munnecke, A.; Samtleben, C.; Bickert, T. (2003). "The Ireviken Event in the lower Silurian of Gotland, Sweden-relation to similar Palaeozoic and Proterozoic events". Palaeogeography, Palaeoclimatology, Palaeoecology. 195 (1): 99–124. doi:10.1016/S0031-0182(03)00304-3. 
  10. "International Chronostratigraphic Chart v.2015/01" (PDF). International Commission on Stratigraphy. Januar 2015.