Journal of Paleontology; September 2008; v. 82; no. 5;
p. 1038-1042; DOI: 10.1666/06-089.1
© 2008 Paleontological Society
Late Permian (Lopingian) Gastropods from the Qubuerga Formation at the Qubu Section in the Mt. Everest (Qomolangma) Region, Southern Tibet (Xizang), China
Pan Hua-Zhang1 and
Shen Shu-Zhong1
1 LPS, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, 210008, <hzpan@nigpas.ac.cn>, <szshen@nigpas.ac.cn>
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LATE PERMIAN gastropod fauna in the Mt. Everest (Qomolangma) region, southern Tibet (Xizang), China is poorly known. This paper describes a small gastropod fauna collected by one of the authors (SSZ) from the upper part of the Qubuerga Formation at the Qubu section. The section is located at about 30 km north of Mt. Everest (Fig. 1). Although a limited number of specimens is available, the fauna is more diverse than all previously reported gastropod faunas (e.g., Yu, 1975) from southern Tibet. Description of the gastropod fauna in the Mt. Everest region adds significant data for understanding the distribution of gastropods during the Late Permian and the paleobiogeographic relationship between the Himalayan and Tethyan regions.
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FIGURE 1—Map showing the location of gastropods described in this paper (after Shen et al. 2003a)
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The Permian strata at the Qubu section have been discussed in detail by Shen et al. (2003a). The Qubuerga Formation yielding the gastropod fauna described herein is composed of siltstone interbedded with shale and bioclastic limestone with a thickness of 255.7 m. This formation is divided into two members. The lower member is dominated by bioclastic limestone and siltstone containing abundant brachiopods and bryozoans. The upper member is composed of black shale and micaceous siltstone. Atomodesma-dominated bivalves and gastropods are abundant in the upper part of the lower member and the upper member (Fig. 2).
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FIGURE 2—Distribution of gastropod species and associated bivalves and brachiopods at the Qubu section (stratigraphic column and brachiopod assemblages after Shen et al., 2003a)
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AGE AND FAUNAL AFFINITIES
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A total of eight species in six genera and an indeterminate genus and species of Neritopsidae are recognized. The identified species are Stachella micra Yu, 1975, Bellerophon sp. cf. B. affinis Waagen, . . . [Full Text of this Article]
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