Ordovician

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Ordovician Period
485.4–443.4 million years ago
Mean atmospheric O
2
content ower period duration
c. 13.5 vol %[1][2]
(68 % of modern level)
Mean atmospheric CO
2
content ower period duration
c. 4200 ppm[3][4]
(15 times pre-industrial level)
Mean surface temperature ower period duration c. 16 °C[5][6]
(2 °C above modern level)
Sea level (abuin present day) 180 m; risin tae 220 m in Caradoc an fawin shairply tae 140 m in end-Ordovician glaciations[7]
Key events in the Ordovician
view • discuss • edit
-485 —
-480 —
-475 —
-470 —
-465 —
-460 —
-455 —
-450 —
-445 —
Key events o the Ordovician Period.
ICS approved stages.

Axis scale: millions o years ago.[9]

The Ordovician is a geologic period and system, the seicont o sax periods o the Paleozoic Era.

References[eedit | eedit soorce]