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- W2390863887 abstract "The far south- westof Yangtze platform is oneof the best regions with well developedforaminiferal fauna of early Early Carboniferous.Detailed systematic work reveals ten zones andsubzones,in ascending order as follows:Quasien-dothyra zone,Bisphaera zone,Cherny- shinellazone,Nodochernyshinella zone (subdividing N .tu-mulosa subzone and Spinotournayellina subzone) ,Tuberendothyra zone,Spinoendothyra zone(subdi-viding Paradainella subzone and Pseudodainellasubzone) ,Dainella zone,Globoendothyra zone,Palaeoparastaffella zone and Eoparastaffella zonefrom late late Devonian to early early Visean.Based on these foraminiferal successions is estab-lished the correlation to Dinant Basin and NorthAmerica. The occurrence of tuberculateforaminifers is a very important stage withinforaminiferal phylogentic evolution of early EarlyCarboniferous. The first appearance of N . tumu-losa characterized by the tuberculate and the contin-uous succession through N . tumulosa- Spinotour-nayllina- primitive Tuberendothyra- advanced Tu-berendothyra to the occurrance of Spinoendothyraare a very complete foraminiferal succession ofTn2 b- Tn3 a interval.This paper described fournew genera and type species and a good evolution-ary relationship among them consists of the chang-ing succession of the Tn2 b- Tn3 a interval.This pa-per redefines the Yauguanian which begins at thebase of Bisphaera zone,regarded as the marker ofCarboniferous basal boundary,and ends with thefirst appearance of Eoparastaffella rotundaVdovenko.Description of New Genera and SpeciesGenus Spinotournayellina gen. nov.Type species Spinotournayellina costifera Wu gen.etsp. nov. Test small,oval to subglobular,one to twovolutions,proloculus and early portion of the coilsalways are to a laterality of the test and tendencyto evolution,the last whorl expands more rapidly.Early portion of the last volution pseudoseptate,last coils well developed true,anteriorly diredted,oblique septa.Two to four chambers,high,ex-panded subglobular.wall single layered and micro-granular. Well developed supplementary depositsas disconnected strong spines,two- thirds of theheight of chamber,and mounds at the floor ofchambers of the last whorl.Remarks Differs from Tournayellina Lipinaby developed true septa and disconnected strongspiny ridges. In five specimens of gen. nov. thefirst and second chambers of the last volutionformed pseudochambers by pseudosepta,then truesepta formed two to three chambers.Therefore,Spinotournayellina is a branch of Tournayellinaphylogeny.Stratigraphic range and distribution Spinotour-nayellina subzone of Early Tournaisian to Palseop-arastaffella zone of Late Tournaisian.Lower por-tion of Yanfang Formation in Yanfang village ofHuanjiang county,Guangxi.Spinotournayellina costifera Wu gen. et sp. nov.( Pl. ,figs.6-8) Test small,Diameter 0 .48- 0 .86 mm,more0 .6 1 - 0 .77mm.Width 0 .6 6 - 1 .2 7mm,mor" @default.
- W2390863887 created "2016-06-24" @default.
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- W2390863887 date "2001-01-01" @default.
- W2390863887 modified "2023-09-22" @default.
- W2390863887 title "FORAMINIFERAL ZONATION OF EARLY EARLY CARBONIFEROUS FROM THE SOUTH-WESTERN MARGIN OF YANGTZE PLATFORM" @default.
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