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Middle Triassic
Second epoch of the Triassic period
Second epoch of the Triassic period
| Field | Value |
|---|---|
| name | Middle Triassic |
| color | Middle Triassic |
| time_start | 246.7 |
| time_end | 237 |
| time_end_prefix | ~ |
| image_map | Mollweide Paleographic Map of Earth, 240 Ma (Ladinian Age).png |
| caption_map | A map of Earth as it appeared 240 million years ago during the Middle Triassic Epoch, Ladinian Age |
| image_outcrop | Obere Schaumkalkbank am Altenberg bei Dörzbach 280308.jpg |
| caption_outcrop | Middle Triassic aged Muschelkalk (Schaumkalk) in Baden-Württemberg, Germany |
| timeline | Triassic |
| name_formality | Formal |
| celestial_body | earth |
| usage | Global (ICS) |
| timescales_used | ICS Time Scale |
| chrono_unit | Epoch |
| strat_unit | Series |
| timespan_formality | Formal |
| lower_boundary_def | Not formally defined |
| upper_boundary_def | FAD of the Ammonite *Daxatina canadensis* |
| upper_gssp_location | Prati di Stuores, Dolomites, Italy |
| upper_gssp_coords | |
| upper_gssp_accept_date | 2008 |
- FAD of the Conodont Chiosella timorensis
- Base of magnetic zone MT1n
- Desli Caira, Northern Dobruja, Romania
- Guandao, Guizhou, China
In the geologic timescale, the Middle Triassic is the second of three epochs of the Triassic period or the middle of three series in which the Triassic system is divided in chronostratigraphy. The Middle Triassic spans the time between Ma and Ma (million years ago). It is preceded by the Early Triassic Epoch and followed by the Late Triassic Epoch. The Middle Triassic is divided into the Anisian and Ladinian ages or stages.
Formerly the middle series in the Triassic was also known as Muschelkalk. This name is now only used for a specific unit of rock strata with approximately Middle Triassic age, found in western Europe. The Ashfield Shale and Bringelly Shale of western Sydney date to this epoch, with the former featuring fluvial fossils from that era.
Middle Triassic life
Main article: :Category:Middle Triassic life
Following the Permian–Triassic extinction event, the most devastating of all mass-extinctions, life recovered slowly. In the Middle Triassic, many groups of organisms reached higher diversity again, such as the marine reptiles (e.g. ichthyosaurs, sauropterygians, thallatosaurs), ray-finned fish and many invertebrate groups like molluscs (ammonoids, bivalves, gastropods).
During the Middle Triassic, there were not yet any flowering plants, but instead there were seed ferns and gymnosperms. Small dinosauriforms began to appear, like Nyasasaurus and the ichnogenus Iranosauripus.
File:Mixosaurus BW.jpg|Mixosaurus cornalianus restoration, a Middle Triassic ichthyosaur
References
References
- (September 2012). "The Global Boundary Stratotype Section and Point (GSSP) of the Carnian Stage (Late Triassic) at Prati Di Stuores/Stuores Wiesen Section (Southern Alps, NE Italy)". Episodes.
- "ICS - Chart/Time Scale".
- Roy M. Farman and Phil R. Bell. (2020). "Australia's earliest tetrapod swimming traces from the Hawkesbury Sandstone (Middle Triassic) of the Sydney Basin". [[Cambridge University Press]].
- "Sampling and Mineralogy of Bringelly Shale". [[The University of Sydney]].
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