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Ordovician

Perioada Ordovician
Acum 485.4–443.4 milioane de ani

O hartă a lumii așa cum apărea în Ordovician (acum 450 milioane de ani)

Conținut mediu de O2 atmosferic pe durata perioadei c. 13.5 vol %
(68 % din nivelul modern)
Conținut mediu de CO2 atmosferic pe durata perioadei c. 4200 ppm
(15 ori nivelul preindustrial)
Temperatura medie a suprafeței pe durata perioadei c. 16 °C
(2 °C deasupra nivelului modern)
Nivelul mării (peste cel actual) 180 m; s-a înălțat la 220 m în Caradoc și a scăzut brusc la 140 m la sfârșitul glaciațiilor ordoviciene.[1]

Ordovicianul este a doua perioadă a Paleozoicului. A început acum 488,3 milioane de ani, la sfârșitul Cambrianului, și s-a terminat acum 443,7 milioane de ani, la începutul Silurianului.

  1. ^ Haq, B. U.; Schutter, SR (). „A Chronology of Paleozoic Sea-Level Changes”. Science. 322 (5898): 64–68. Bibcode:2008Sci...322...64H. doi:10.1126/science.1161648. PMID 18832639. 

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Ordovician
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