A Finding of Mollusks Watsonella crosbyi Grabau (Gastropoda: Helcionelliformes) in the Botomian of China
- 16 Downloads
The mollusk species Watsonella crosbyi Grabau, 1900 was found among other mollusks in the Lower Botomian strata of the Xinji Formation on the Northern China Platform (Shaanxi Province). Taxonomically the mollusk assemblage is extremely similar to that from the Mernmerna Formation, Parara Limestone, and Sellick Hill Formation of Southern Australia, the Bastion Formation of Laurentia, and the uppermost Emyaksin Formation of the Siberian Platform. All these strata can be aged as Early Botomian. The new finding of Watsonella crosbyi confirms the significant time range of the species distribution (Tommotian–Botomian) and raises doubts about newly proposed correlations of the Lower Cambrian of Southern Australia making the previously determined age of the formations one or even two ages older.
We thank the organizers of ICECS-2018 headed by Professor Zhang Xingliang for the hospitality and the opportunity to collect material in the studied sections.
This work was supported by the Russian Foundation for Basic Research, project nos. 16-05-00651 and 19-05-00526.
- 1.A. I. Varlamov, A. Yu. Rozanov, Yu. E. Demidenko, et al., in Proc. All-Russ. Meet. “General Russian Stratigraphic Scale: Current State and Ways of Perfection.” Moscow, May 23–25,2013, Ed. by M. A. Fedonkin (Geol. Inst., Russ. Acad. Sci., Moscow, 2013), pp. 79–87 [in Russian].Google Scholar
- 2.Peng Sanchi, L. E. Babcock, and R. A. Cooper, The Geologic Time Scale 2012, Ch. 19: The Cambrian Period (Elsevier, Amsterdam, 2012), Vol. 1, pp. 437–488.Google Scholar
- 4.P. Yu. Parkhaev, G. A. Karlova, and A. Yu. Rozanov, Mus. North. Ariz. Bull., No. 67, 298–300 (2011).Google Scholar
- 5.P. Yu. Parkhaev, G. A. Karlova, and A. Yu. Rozanov, J. Guizhou Univ. 29 (Suppl. 1), 179–180 (2012).Google Scholar
- 6.P. Yu. Parkhaev, in Proc. Ext. Sum. IGCP Project, 591 Field Workshop 2014 (Nanjing Univ. Press, Nanjing, 2014), pp. 102–105.Google Scholar
- 7.P. Yu. Parkhaev, in The Cambrian Biostratigraphy of the Stansbury Basin, South Australia, Ed. by E. M. Alexander, J. B. Jago, A. Yu. Rozanov, and A. Yu. Zhuravlev (MAIK Nauka/Interperiodica, Moscow, 2001), pp. 133–210 [in Russian].Google Scholar
- 14.A. Kouchinsky, M. Steiner, S. Clausen, and M. Vendrasco, Acta Palaeontol. Pol. 60 (2), 421–512 (2015).Google Scholar
- 15.C. B. Skovsted, Bull. Geol. Soc. Den. 51, 11–37 (2004).Google Scholar