Middle Triassic
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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 Expression error: Unexpected round operator Ma and Expression error: Unexpected round operator 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.[1]
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.[citation needed] The Ashfield Shale and Bringelly Shale of western Sydney date to this epoch, with the former featuring fluvial fossils from that era.[2][3]
Middle Triassic life
Script error: No such module "Labelled list hatnote". 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).[citation needed]
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.[citation needed]
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Mixosaurus cornalianus restoration, a Middle Triassic ichthyosaur
References
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- ^ Page Module:Citation/CS1/styles.css has no content."ICS - Chart/Time Scale" (PDF). Archived from the original (PDF) on 2025-01-01. Retrieved 2025-01-14.
- ^ Page Module:Citation/CS1/styles.css has no content.Roy M. Farman and Phil R. Bell (2020). "Australia's earliest tetrapod swimming traces from the Hawkesbury Sandstone (Middle Triassic) of the Sydney Basin". Journal of Paleontology. 94 (5). Cambridge University Press: 966–978.
- ^ Page Module:Citation/CS1/styles.css has no content."Sampling and Mineralogy of Bringelly Shale" (PDF). The University of Sydney. Retrieved May 12, 2025.
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