Sheng, J. Z.; Rui, L. (1984). 江西乐平鸣山矿区上二叠统长兴阶的类 - Fusulinaceans from Upper Permian Changhsingian in Mingshan Coal Field of Leping, Jiangxi. 微体古生物学报 - Acta Micropalaeontologica Sinica. 1(1): 30-46.

336253

Sheng, J. Z.; Rui, L.

1984

1(1): 30-46

Publication

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The Mingshan Coal Field located at about 7.5km west of Leping County, Jiangxi Province is known as the type locality of the Wangpanli, Shizishan, Laoshan and Guanshan Members of the Leping Formation and it is a famous synclinal basin in the east part of the Pingxiang-Leping depositional depression. The Leping Formation is well exposed in this basin, but its overlying Changhsingian mostly covered by Quaternary deposits. Recently, No. 223 Geological Prospecting Team of Coal Bureau of Jiangxi Province discovered an excellent Upper Permian Changhsingian section which consists of light grey, whitish grey and grey thick-bedded to massive pure limestones, with cherty nodules in the lowermost and uppermost parts, about 148.6 m in thinkness. The carbonate grains consist mainly of benthonic fragments varying from sand to pebble in size. The carbonate rocks are composed of grainstone containing biosparudite, biocalcir.enite, calcirudite and calcirenite, and a small part of wakestone containing biomicrudite, representing a neritic open platform environment with medium to high energy. The biota is characterized by the most diversified benthos, such as fusulinaceans, non-fusuline foraminifets, calcareous algae, limestone facies brachiopods and so on, and by the absence of nearly all kinds of planktons.The fusulinaceans studied in this paper comprise 34 species including some unnamed species and 6 new species in 7 genera (Table 1), Two fusulinacean zones can be recognized in ascending order as follows. 1. Gallowayinella meitienensis zone This zone is confined to the lowermost part of the section, about 8.2m in thickness, and it is rather monotonic, composed of only 2 species of the genues Gallowayinella which represents a lower Changhsingian endemic form in South China. G. meitienensis is widesperad in the lower part of the Changhsingian and has been referred to the G. meitienensis subzone of Palaeofusulina zone in South China (Sheng Rui, 1980). It is here designated as the zonal fossil for the G. meitienensis zone, representing the lower Changhsingian in the Mingshan Coal Field.2. Palaeofusulina sinensis zone This zone conformably overlies the Gallowayinella meitienensis zone, about 140.44m in thickness. It is characterized by the entire absence of the genus Gallowayinella and by the occurrence of the advanced species of Palaeofusulina (Table 1). The leading form P. sinensis is most widely distributed in the upper Changhsingian in South China and is referred to the P. sinensis subzone of the Palaeofusulina zone (Sheng Rui, 1980). This subzone is here raised to a zonal lovel, i. e. the P. sinensis zone, representing the middle and upper Changhsingian in the Mingshan Coal Field.Diagnosis of New SpeciesNankinella mingshanensis sp. nov.(P1. ?, figs. 24—26)This new species is characterized by its smaller size, fewer volutions, lenticular shell with a bluntly angular periphery, tightly coiled volutions and fairly thick spirotheca composed of rectum, thicker diaphanotheca and discontinuous thinner lower tectorium as compared with Nankinella quasihunanensis Sheng and N. minor Sheng.Nanlingella ]iangxiensis sp. nov.(P1. ?, figs. 20—22)The new species has a smaller fusiform, tightly coiled shell with bluntly pointed poles, which serve to distinguish it from Nanlingella guizhouensis(Rui).Paiaeofusulina lepingensis sp. nov.(P1. ?, figs. 7—9)1979 Palaeofusulfna sp. Rui, p. 290, pl.4 fig. 8.This species can be distinguished from Palaeofusulina pulla Sheng and P. abscondida Lin by its much smaller and nearly fusiform shell with a broadly vaulted medium portion, bluntly rounded poles, and less volutions. Palaeofusulina mingshanica sp. nov.(P1. ?, figs. 10—12)The diagnostic character of this species lies in its smaller and elongate fusiform shell, with tightly coiled volutions and a greater form ration, by which it can be distinguished from P. fusiformis Sheng and P. meilinica Wang Y. H.Palaeofusulina jiangxiana sp. nov.(P1. ?, figs. 18, 19)This species is closely allied toPalaeofusulina pulla Sheng, P. parafusiformis Lin and P. typica Ru

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