Silurian

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Silurian Period
443.8–419.2 million years aby
Mean atmospheric O
2
content ower period duration
c. 14 vol %
(70 % o modren level)
Mean atmospheric CO
2
content ower period duration
c. 4500 ppm
(16 times pre-industrial level)
Mean surface temperatur ower period duration c. 17 °C
(3 °C abuin modren level)
Sea level (abuin present day) Aroond 180 m, wi short-term negative excursions[1]
Key events in the Silurian
-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 443.8 million years ago (Mya), tae the beginnin o the Devonian Period, 419.2 Mya.[4]

References[eedit | eedit soorce]

  1. 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. 
  2. 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. 
  3. 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. 
  4. "International Chronostratigraphic Chart v.2015/01" (PDF). International Commission on Stratigraphy. January 2015.