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《Acta Palaeontologica Sinica》 1965-02
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ORDOVICIAN AND SILURIAN CEPHALOPODS FROM HANZHUNG AND NINGKIANG OF SHENSI

LAI CHAI-GEEN  
The material on which this report is based comes from five different horizons of Ordovician and Silurian,in Shensi Province.Most of them were obtained by L.W. Hsiang and P.Y.Lin(1960)in three localities i.e.,Chaochiapa,Erlangpa and Huang- paji of Ningkiang.A few specimens were collected from Liangshan of Hanzhung and Chaochiapa of Ningkiang,Shensi Province,by Y.T.Chao and the writer(1962).And one specimen was collected from Xingi of Hanzhung,by a geological team of the Geo- logical Bureau of Shensi(1960). Table 1 shows the horizons and localities of each species described in this paper. Cephalopods of Chaochiapa formation The lower part of the Chaochiapa formation yields very abundant graptolites(e.g. Didymograptus deflexus,D.protobifidus),brachiopods,and cephalopods which comprise the following species: Ellesmeroceras sp.? Anthoceras concavum Lai(sp.nov.) Catoraphiceras undulatum Lai(sp.nov.) These genera are characteristic of the Upper Canadian of North America and Chunya stage of Siberian platform of U.S.S.R. Cephalopods of Shihliangssu Shale Only one specimen of Chisiloceras,C.neichianense(Yu)?,was obtained from Shih- liangssu shale of Liangshan,Hanzhung,Shensi.It was associated with some trilobites, such as Ningkianolithus welleri,Hanchungolithus multisoriatus and graptolites,e.g. Didymograptus leeszekuangi.In the same district,Prof.Huo(1960)collected from O_4 (=Shihliangssu shale)some cephalopods,e.g.Vaginoceras sp.,Cameroceras sp.and Palaeocycloceras sp. Endo(1932)described the following species from Hanzhungfu of Shensi,and re- ferred them to Upper Ordovician age.However,they are known to be of Lower Ordo- vician age being obtained from Shihliangssu shale(or Lower part of Prof.Lu's “Yang- tzella beds”). Protocycloceras shensiense(Endo)(=Cycloceras?shensiense Endo) Protocycloceras louderbacki(Endo)(=Cycloceras louderbacki Endo) Chisiloceras neichianense(Yü)(=Endoceras centrotubulatum Endo) In South Shensi cephalopods have not yet been found in the overlying “Yangtzella beds”,the characteristic Yangtzella poloi is also restricted to the lower part of them. According to the lithologic character,Shihliangssu shale and the lower part of “Yangtzella beds”may be united into an assemblage corresponding to the upper part of Dawan for- mation of West Hupeh.While the upper part of the “Yangtzella beds”may agree with the Kuniutang limestone and the Miapo shale of that region. The fauna of Dawan formation consists of very abundant graptolites and cephalo- pods,the latter includes the following species: Bathmoceras sp. Kotoceras curvature Lai Cochlioceras yangtzeense Chang Michelinoceras yangi Chang C.sinense Chang M.hupehense Chang C.lingfengkowense Lai M.mui Chang Chisiloceras changyangense(Chang) M.dobaosense Chang C.neichianense(Yü) M.chaoi Chang C.reedi(Yü) Orthoceras?thyrsus Barr. Dideroceras endoseptum(Chang) Protocycloceras hupehense D.wahlenbergi(Foord) (Shimizu and Obata) D.endocyclindricum(Yü) P.hupehense var.remotum Lai Endoceras leei YüP.wangi Yü E.chienchangi Lai Thylacoceras yangtzeense(Yü) E.suni Lai Vaginoceras mui Chang On the basis of its graptolites fauna,the Dawan formation is correlated with the Upper part of Arenigian and Lower part of Llanvirnian(Mu,1953;Lee,1961).Ac- cording to its cephalopods,this formation corresponds to the Orthoceras limestone(B_3) of Baltic Province. Cephalopods of Pagoda limestone In the lithologic and faunistic characters,the Pagoda limestone of Shensi agrees with that of West Hupeh.The underlying Miaopo shale yields Glyptograptus teretisculus and Nemagraptus gracilis.However,G.teretisculus is also obtained from the Lower marl bed of the Pagoda limestone in Liangshan,Shensi(Huo,1960).Therefore,the Pagoda lime- stone is correlated with the Caradocian of British classification. From the Pagoda limestone the following seven genera are described in this paper. All but one,viz Sinoceras,agree with Balaschov's Secondary Association of nautiloids in Baltic Province of U.S.S.R. Sinoceras Bactroceras Lituites Oelandoceras Orthoceras Polygrammoceras Michelinoceras According to the fact that the genera and species,Lituites sp.,Bactroceras angusti- siphonatum and Orthoceras regulare are restricted to “Echinosphaeritenkalk”,the Pagoda limestone presumably corresponds to “Echinosphaeritenkalk”of Baltic Province. Cephalopods of Nancheng Shale One species,Mysterioceras shengi(sp.nov.)is obtained from Nancheng Shale of Liangshan,Shensi.It occurs together with Dalmanitina nanchengensis and Eohomalona- tus sp. Cephalopods of Lojoping formation In 1960,Hsiang and Lin collected some corals,brachiopods and nautiloids from the yellowish green shale,on a hillock about 500 m north-west of Erlangpa,Ningkiang,Shen- si.Lin considered the corals to be of Middle Silurian age.The following species of nautiloids are described: Jangziceras sichuanense Lai Sichuanoceras stenosiphonatum Lai(sp.nov.) Ningkianoceras centrale Lai(gen et sp.nov.) Oocerina triangulata Lai Among them Jangziceras sichuanense has been discovered in the Lojoping formation of Middle Silurian,in Szechuan and Kweichow Province.Accordingly,the yellowish green shale is considered to be of Middle Silurian age. DESCRIPTION OF SPECIES Protocycloceratidae Kobayashi 1935 Catoraphiceras Ulrich et Foerste 1936 Catoraphiceras undulatum Lai(sp.nov.) (Pl.1,figs.3—4) Diagnosis:This is an annulated orthoceracone with depressed cross section,and marginal siphuncle being about 1/3 the diameter of the shell.The annulations cross the conch transversely.Two to 3 annulations or 6—7 camerae occupy a length equal to the dorso-ventral diameter of the conch.The sutures are approximately transverse but sinuous.Each suture forms a narrow,deep ventral lobe,a broad,shallow lateral saddle and dorsal lobe. Remarks:The present species is similar to Catoraphiceras lobatum Ulrich et Foerste and C.carpyschevi Balaschov.It differs from Catoraphiceras lobatum in its shal- lower ventral lobes and larger siphuncle.From C.carpyschevi it differs in having trans- versal annulations,and in having lateral saddles and dorsal lobes. Horizon and locality:From the lower part of the Chaochiapa formation,at Ma- jan-ja south-western Huangpaji,Ningkiang,Shensi Province.(Coll.Hsiang and Lin, 1960).Cat.No.Ce3033(holotype),Ce3034(paratype). Baltoceratidae Kobayashi 1935 Bactroceras Holm 1898 Bactroceras angustisiphonatum(Rüd.) (Pl.1,figs.10—11;Text-fig.1) Remarks:The present specimens agree with the holotype of Bactroceras angusti- siphonatum Rüdiger in the outline of the siphuncle and the height of the camerae.But our form has a shorter septal neck than that of Rüdiger's.This feature may be of a minor difference in the individual and cannot serve to characterize a distinct species. Horizon and locality:From the Pagoda limestone of Shuang-ho-kow,Chaochia- pa,Ningkiang,Shensi Province.The specimens were collected by Hsiang and Lin (1960).Cat.No.Ce3036,Ce3037. Bactroceras?chinense Lai(sp.nov.) (Pl.2,figs.1,5.;Text-fig.2) Diagnosis:The conch is longiconic orthoceracone with circular cross section.The siphuncle occupies the position between the periphery and the center of the shell,its dia- meter is about 1/8 that of the shell.The septal necks are very short and orthochoanitic. About one and a half camerae occupy a length equal to the diameter of the shell.The sutures are straight and directly transverse to the long axis of the conch.The surface of the shell is covered with very fine oblique striae,which are arched on the ventral side. Remarks:The new species is closely related to Bactroceras angustisiphonatum,but differs from the latter in the position of the siphuncle.Its siphuncle is nearer to center than that of B.angustisiphonatum.It may be also readily distinguished from Bactroceras avus Holm and Bactroceras latisiphonate Glenister,for the latter species have much more approximate septa,subventral siphuncle and much longer septal necks. Horizon and localities:The holotype was collected by a geological team of the Geological Bureau of Shensi,from the Pagoda limestone at Xin-gi,Hanzhung in South Shensi.Cat.No.Ce3038;Paratype was obtained from the same bed at Liangshan,Han- zhung,Shensi.(Coll.Chao and the writer,1962).Cat.No.Ce3039. Proterocameroceratidae Kobatashi 1937 Oelandoceras Foerste 1932 Oelandoceras sp. (Pl.2,fig.4;Text-fig.3) Remarks:This specimen must undoubtedly be referred to this genus,although the state of preservation is not sufficiently good to allow for any determination of the species. In our specimen the septal necks extend for a length equal one-fourth that of a camera,their tips may be forked.The connecting rings consist of two layers,forming outer and inner zones.The inner zone is thicker than the outer.In the siphuncle there is a conical cavity.It is probably an endocone.These characters of the structure of the siphuncle are described for the first time in the genus Oelandoceras.On this basis the genus is placed in Proterocameroceratidae. Horizon and locality:Obtained from the Pagoda limestone of Erlangpa-gie, Erlangpa area,Ningkiang,Shensi.(Coll.Hsiang and Lin,1960).Cat.No.Ce3040. Anthoceras Teichert et Glenister 1954 Anthoceras concavum Lai(sp.nov.) (Pl.1,figs.2,6;Text-fig.4) Diagnosis:The shell is annulated orthoceracone with depressed cross section.The siphuncle is large and marginal,its diameter being about 1/3 that of the shell.Five— 6 camerae or 3 annulations occupy a length equal to the diameter of the shell.In gen- eral,the curvature of septum occupys one and a half camerae.Each suture forms a shal- low dorsal and ventral lobe,and a broad shallow lateral saddle. Endosiphuncle is highly specialized.The endocones are considered as semicircular, terminating centrally slender.Its ventral side in middle is sometimes concave. Remarks:According to the external form,especially the
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1 CHENG Li-ren 1 , ZHANG Yu-jie 2 , ZHANG Yi-chun 1 (1.College of Earth Sciences, Jilin University, Changchun130061, China; 2. Chengdu Institute of Geology and Mineral Resources, Chengdu610082, China);Ordovician Nautiloid Fossils of Xainza Region,Tibet[J];Journal of Jiling University (Earth Science Edition);2005-03
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1 ZHANG Yi-chun~(1),CHENG Li-ren~(1),ZHANG Yu-jie~(2)(1.College of Earth Sciences, Jilin University, Changchun130061, China;2.Chengdu Institute of Geology and Mineral Resources, Chengdu610082, China);The Ordovician system in the Xainza region, north Tibet[J];Journal of Jiling University (Earth Science Edition);2004-04
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10 Lai Caigen (Institute of Geology,Chinese Academy of Geological Sciences);ORDOVICIAN CEPHALOPODS FROM MT.QUERQUERK(MT.CHARCHAG),XINJIANG[A];[C];1987
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3 A.T.MU Institute of Palaeontology,Academia Sinica;ON THE WUFENG SHALE[J];Acta Palaeontologica Sinica;1954-02
4 SHENG JING-CHANG Institute of Palaeontology,Academia Sinica;PERMIAN FUSULINIDS FROM LIANGSHAN,HANCHUNG,SOUTHERN SHENSI[J];Acta Palaeontologica Sinica;1956-02
5 YANG KING-CHIH Institute of Palaeontology,Academia Sinica;SOME BRYOZOA FROM THE UPPER PART OF THE LOWER ORDOVICIAN OF LIANGSHAN,SOUTHERN SHENSI(INCLUDING A NEW GENUS)[J];Acta Palaeontologica Sinica;1957-01
6 Чжан Жи-дун Палеонмолоцческц■ цнсмцмум Ака(?)е(?)цц наук КНР;ИСКОПАЕМЫЕ НАУТИЛОИДЕИ ГОЛОВОНОΓИХ В ЗОНЕ YANGTZEELA POLOI СРЕДНЕГО ОРДОВИКА ЧАНЪЯНА ХУБЭЯ[J];Acta Palaeontologica Sinica;1957-01
7 WU WANG-SHIH (Institute of Paleontology,Academia Sinica);UPPER PERMIAN CORALS FROM LIANGSHAN,S.SHENSI[J];Acta Palaeontologica Sinica;1957-02
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