Early Triassic


Early Triassic

The Early Triassic (also known as Lower Triassic, Buntsandstein, or Scythian) is the first of three epochs of the Triassic period. It spans the time between 251 ± 0.4 Ma and 245 ± 1.5 Ma (million years ago). The Permian-Triassic extinction event spawned the Triassic period. It also marked the beginning of the Mesozoic era and is divided into the Induan and Olenekian faunal stages. 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. 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

* Geologic time scale

References

* [http://www.stratigraphy.org/geowhen/stages/Early_Triassic.html GeoWhen Database - Early Triassic]
* [http://www.palaeos.com/Mesozoic/Triassic/EarlyTrias.htm Palaeos]
* [http://www.scotese.com/etriascl.htm scotese]


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Triassic Period — Interval of geologic time, с 248–206 million years ago, that marks the beginning of the Mesozoic Era. Many new vertebrates emerged during the Triassic, heralding the major changes that were to occur in both terrestrial and marine life forms… …   Universalium

  • Triassic — Geological period from=251 middle=225 to=199 o2=16 co2=1750 temp=17The Triassic is a geologic period and system that extends from about 251 to 199 Ma (million years ago). As the first period of the Mesozoic Era, the Triassic follows the Permian… …   Wikipedia

  • Early Jurassic — For general context see Jurassic .The Early Jurassic (in geology referred to as the Lower Jurassic, originally (and still in Europe) the Lias ) is the earliest of three epochs of the Jurassic period. Early Jurassic starts immediately after the… …   Wikipedia

  • Triassic–Jurassic extinction event — The Triassic–Jurassic extinction event marks the boundary between the Triassic and Jurassic periods, Ma|Jurassic, and is one of the major extinction events of the Phanerozoic eon, profoundly affecting life on land and in the oceans. Twenty… …   Wikipedia

  • Permian–Triassic extinction event — …   Wikipedia

  • Middle Triassic — System Series Stage Age (Ma) Jurassic Lower Hettangian younger Triassic Upper …   Wikipedia

  • Timeline of early prehistory — This page lists events in the early prehistory of the universe and the Earth, up to approximately 10,000 BC. Note that many of these dates are speculative or very rough estimates. For events from 10,000 BC onwards, see 10th millennium BC. For… …   Wikipedia

  • Evolution of mammals — Restoration of Thrinaxodon, a member of the cynodont group, which includes the ancestors of mammals Further information: Evolutionary history of life The evolution of mammals within the synapsid lineage (sometimes called mammal like reptiles )… …   Wikipedia

  • dinosaur — /duy neuh sawr /, n. 1. any chiefly terrestrial, herbivorous or carnivorous reptile of the extinct orders Saurischia and Ornithischia, from the Mesozoic Era, certain species of which are the largest known land animals. 2. something that is… …   Universalium

  • Geology of Alderley Edge — Infobox Mountain Name = Alderley Edge Photo = Stormy Point 1993.jpg Caption = Stormy Point Elevation = 183 m (600 ft) Location = Cheshire, ENG Range = Prominence = Coordinates = Topographic OS Landranger 118 Grid ref UK = SJ870760 Grid ref… …   Wikipedia


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.