Triassic

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Triassic Period
252.2–201.3 million years ago
Mean atmospheric O
2
content ower period duration
c. 16 vol %[1][2]
(80 % of modern level)
Mean atmospheric CO
2
content ower period duration
c. 1750 ppm[3][4]
(6 times pre-industrial level)
Mean surface temperature ower period duration c. 17 °C[5][6]
(3 °C above modern level)
Key events in the Triassic
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-255 —
-250 —
-245 —
-240 —
-235 —
-230 —
-225 —
-220 —
-215 —
-210 —
-205 —
-200 —
Full recovery of woody trees[7]
Coals return[8]
Scleractinian
corals & calcified sponges[9]
An approximate timescale o key Triassic events.
Axis scale: millions o years ago.

The Triassic, accordin tae current scienteefic consensus, is a geologic period an seestem which spans 50.9 million years frae the end o the Permian Period 252.2 million years ago (Mya), tae the beginnin o the Jurassic Period 201.3 Mya.

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. McElwain, J. C.; Punyasena, S. W. (2007). "Mass extinction events and the plant fossil record". Trends in Ecology & Evolution. 22 (10): 548–557. doi:10.1016/j.tree.2007.09.003. PMID 17919771. 
  8. Retallack, G. J.; Veevers, J.; Morante, R. (1996). "Global coal gap between Permian–Triassic extinctions and middle Triassic recovery of peat forming plants". GSA Bulletin. 108 (2): 195–207. doi:10.1130/0016-7606(1996)108<0195:GCGBPT>2.3.CO;2. Retrieved 2007-09-29. 
  9. Payne, J. L.; Lehrmann, D. J.; Wei, J.; Orchard, M. J.; Schrag, D. P.; Knoll, A. H. (2004). "Large Perturbations of the Carbon Cycle During Recovery from the End-Permian Extinction". Science. 305 (5683): 506–9. doi:10.1126/science.1097023. PMID 15273391.