Zhang, L.-x.; Li, W.-y. (1987). 江苏大丰石炭纪及早二叠世栖霞期(竹蜓)类 - Carboniferous and lower Lower Permian (Chihsia Stage) fusulinids of Dafeng District, Northern Jiangsu. 古生物学报 - Acta Palaeontologica Sinica. 26(4): 392-410.

291178

Zhang, L.-x.; Li, W.-y.

1987

26(4): 392-410

Publication

Available for editors   [request]

This paper describes the Carboniferous and lower Lower Permian (Chihsia stage fusulinids collected in Dafeng County of Northern Jiangsu. They are well distributed from the top of the Lower Carboniferous to the Early Permian Chihsia stage with a very clear succession, which can be divided and described in descending order as follows: Super-formation: Pukou Formation Unconformity Lower Permian Chihsia stage (Chihsia Formation) Dark grey to blackish grey bioclastic limesone with argillaceous limestone, including two parts: upper part containing the fusulinids Nankinella hunanensis Chen, N.rhomboidea Wang, N.cf.minor Sheng, N.sp., Staffella sp.2; lower part containing Misellina claudiae Deprat, Staffella cf.moellerana Thompson and Pseudovermiporella sp., Gymnocodium sp., with Misellina claudiae as one of the dominant forms, which is only confined to this part. Upper Carboniferous (Chuanshan Formation) Light grey biocalastic limestone with a total thickness of about 10 m, containing the fusulinids Triticites sp., Schubertella zhejiangica and the fossil algae Girvanella sp.. Upper Carboniferous (Huanglong Formation). With a total thickness of about 60 m including three parts: Upper part- Light grey to grey bioclastic limestone, and limestone, yielding the fusulinids Fusulinella vozhgalensis devexa Rauser, F. bocki Moeller, F. colaniae Lee et Chen, Fusulina dafengensis sp.nov., F. nytvica callosa Safonova, F. citronoides Manukalova , F.cf.schellwieni (Staff), Profusulinella wangyüi Sheng, P. parva Lee et Chen, P. ovata Rauser, P. prolibrovichi Rauser and P. cybaea Leontovich. Middle part- Light grey bioclastic limestone, from which the following forms have been found: Profusulinella wangyüi Sheng, P. ovata Rauser, Taitzehoella taitzehoensis Sheng, Fusulinella vozhgalensis devexa Rauser, F. laxa Sheng, Schubertella lata Lee et Chen, S. gracilis Rauser and S. obscura Lee et Chen. Lower part- Whitish grey macrocrystalline limestone with a greenish grey mudstone bed, from which no fossils have been found. Lower Carboniferous (Hochow Formation) Dark grey to blackish grey limestone with dark grey and greenish grey mudstone about 20 m in total thickness,from which the following fusulinids have been found: Pseudoendothyra kremenskensis Rosovskaya, P. dafengensis sp.nov., P. struvei Moeller, P. orassa regina Rosovskaya,P.composita Dutkevich, P.angulata Rauser, Eostaffella vesta Rosovskaya, E.accepta Ganellina, E.endothyroidea Chang, E. postmosquensis Kireeva and E. hohsienica Chang. Among them, Eostaffella hohsienica is the most common and important fusulinid species of the Hochow Formation in Anhui, and has been regarded by Chang (1962) as a zonal fossil. Conformity Subformation:Kaolishan Formation A tentative correlation of the fusulinids is tabulated in the Chinese text for reference. Description of new species Genus Fusulina Fischer et Weldheim,1829 Fusulina dafengensis sp.nov. (P1.II,fig.18) Shell of median size,elongate fusiform with slightly vaulted median portion and pointed polar ends.The holotype having 5(1/2) volutions about 3.24 mm long and 1.0 mm wide,giving a form ra- tio of 3.24:1. Width of first to last volution about 0.23,0.33,0.45,0.61,0.85 and 1.0 mm. Spirotheca rather thin,composed of a thin rectum,a thicker diaphanotheca and a thinner tectorium. Septa almost plane in the central part, regularly and gently fluted so as to form a loosely rounded fold in the lateral regions of the chambers and a simple network in the poles. Chomata well developed in all volutions,about 1/2 as high as the respective chambers. Tunnel wider and narrow. Axial fillings distinctly developed in all volutions. Proloculus rather large,about 0.15 mm in outside diame- ter. Remarks:This new species is marked by the very heavy axial fillings, a less stronger septal fluting and smaller chomata. It is similar to Fusulina pankouensis Lee from the Penchi Formation of the Taitzeho valley, but differs from the latter in having a less stronger septal fluting, a smaller size and a smaller form ratio. Cat.No.94031(Holotype). Genus Pseudoendothyra Mikhailov,1939 Pseudoendothyra dafengensis sp.nov. (P1.III,figs.16,22,23) Shell small,subspherical with depressed umbilical regions. The holotype having 3 volutions about 1.28 mm length and 1.33 mm width,with a form ratio of 0.96:1. Spirotheca relatively thick (about 0.08 mm)and highly replaced by secondary mineralization. Septa unfluted. Chomata massive in the 2—2(1/2) volutions,extending laterally to the polar regions, about 1/2 as high as the respective chambers. Tunnel wide. Prololucus large,about 0.1—0.15 mm in outside diameter. Remarks: In general shape,this form is similar to Pseudoendothyra pseudosphaeroides Dutkevich,but the latter has a smaller form ratio in all volutions, more volutions and less chomata. Cat Nos.94059 (Holotype); 94052,94058 (Paratypes).

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