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System Series Stage Age (Ma)
Jurassic Lower Hettangian younger
Triassic Upper Rhaetian 199.6–203.6
Norian 203.6–216.5
Carnian 216.5–228.0
Middle Ladinian 228.0–237.0
Anisian 237.0–245.0
Lower Olenekian 245.0–249.7
Induan 249.7–251.0
Permian Lopingian Changhsingian older
Subdivision of the Triassic system according to the IUGS, as of July 2009.
Sandstone from the Early Triassic epoch

The Early Triassic is the first of three epochs of the Triassic period of the geologic timescale. It spans the time between 251 ± 0.4 Ma and 245 ± 1.5 Ma (million years ago). Rocks from this epoch are collectively known as the Lower Triassic, which is a unit in chronostratigraphy. The Early Triassic is the oldest epoch of the Mesozoic era and is divided into the Induan and Olenekian ages.

The Lower Triassic series is coeval with the Scythian stage, which is today not included in the official timescales but can be found in older literature. In Europe, most of the Lower Triassic is composed of so called Buntsandstein, a lithostratigraphic unit of continental red beds.

Early Triassic life

The Permian-Triassic extinction event spawned the Triassic period. The massive extinctions that ended the Permian period and Paleozoic era caused extreme hardships for the surviving species. Many types of corals, brachiopods, molluscs, echinoderms, and other invertebrates had completely disappeared. The most common Early Triassic hard-shelled marine invertebrates were bivalves, gastropods, ammonoids, echinoids, and a few articulate brachiopods. The most common land animal was a small herbivorous synapsid Lystrosaurus.

Early Triassic faunas lacked biodiversity and were relatively homogenous throughout the epoch due to the effects of the extinction, ecological recovery on land took 30M years [1]. The climate during the Early Triassic epoch (especially in the interior of the supercontient Pangaea) was generally arid and dry and deserts were widespread however the poles possessed a Temperate climate. The relatively hot climate of the Early Triassic may have been caused by widespread volcanic eruptions which accelerated the rate of global warming and possibly caused the Permian Triassic extinction event.

See also

References

  1. ^ Sahney, S. and Benton, M.J. (2008). "Recovery from the most profound mass extinction of all time" (PDF). Proceedings of the Royal Society: Biological 275: 759. doi:10.1098/rspb.2007.1370. http://journals.royalsociety.org/content/qq5un1810k7605h5/fulltext.pdf.  
Triassic period
Lower/Early Triassic Middle Triassic Upper/Late Triassic
Induan | Olenekian Anisian | Ladinian Carnian | Norian
Rhaetian
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