Marine late Triassic-Jurassic carbon-isotope excursion and biological extinction records: New evidence from the Qiangtang Basin, Eastern Tethys: Comment and reply

This is a comment on the Triassic and Jurassic boundary from the Qiangtang region, northern Tibet, reported by Hu et al., 2020, as there is no convincing evidence to support the identification of the boundary in the section, either by stratigraphy or by fossils presented in the paper. •It is not agreeable with the conclusion that the first high-resolution carbonate carbon-isotope record, geochemistry, palaeontologic and lithological data from a marine T-J section (Wenquan section) …in Eastern Tethys”.•No high-resolution palaeontological and lithological data that can be derived from the Wenquan section, Qiangtang.•No new evidence of a bio-extinction has been demonstrated by Hu et al. (2020), regardless that the paper is titled of the paper is entitled …”biological extinction records: new evidence from the Qiangtang Basin…