1. State Key Laboratory of Continental Dynamics Shaanxi Key laboratory of Early Life & Environments, & Department of Geology Northwest University Xi'an 710069 China
2. Department of Earth Sciences Palaeobiology Uppsala SE‐752 36 Sweden
3. Department of Geology National Museum of Wales Cathays Park Cardiff CF10 3NP UK
4. Department of Geology Faculty of Sciences Golestan University Gorgan Iran
5. Department of Geology Institute of Earth Sciences St Petersburg State University St Petersburg Russia