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] |
The Ordovician is a geologic period and system, the seicont o sax periods o the Paleozoic Era.
References[eedit | eedit soorce]
- ↑ Image:Sauerstoffgehalt-1000mj.svg
- ↑ Image:OxygenLevelsThroughEarthHistory.png
- ↑ Image:Phanerozoic Carbon Dioxide.png
- ↑ Image:CO2LevelsThroughEarthHistory.png
- ↑ Image:All palaeotemps.png
- ↑ Image:TemperatureLevelsOverEarthHistory.png
- ↑ 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.
- ↑ Wellman, C.H.; Gray, J. (2000). "The microfossil record of early land plants". Phil. Trans. R. Soc. B. 355 (1398): 717–732. doi:10.1098/rstb.2000.0612. PMC 1692785
. PMID 10905606.
- ↑ Gradstein, F. M., ed. (2012). The Geologic Time Scale 2012. Elsevier Science Ltd. p. 504. ISBN 978-0444594259.
