The middle Cambrian cosmopolitan key species <i>Lejopyge laevigata</i> and its biozone: new data from Sweden

Axheimer, Niklas; Eriksson, Mats E.; Ahlberg, Per; Bengtsson, Anders

doi:10.1017/s0016756806002007

Cited by 32 publications

(39 citation statements)

References 26 publications

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“…This interval of the Teta Member of the upper Karsha Formation is referred to the Lejopyge acantha Zone. As noted by Peng and Robison (2000), the L. laevigata Zone of South China is correlatable with the Solenopleura brachymetopa Zone of Sweden , and to the lower part of the revised L. laevigata Zone of Sweden, into which the Swedish S. brachymetopa Zone has recently been merged (Axheimer et al, 2006). Globally, the Himalayan Lejopyge acantha Zone can be correlated with the basal part of Guzhangian Stage as the base of the stage coincides with the FAD of Lejopyge laevigata (Peng et al, 2009) (Figs.…”

Section: Biostratigraphy and Global Correlationmentioning

confidence: 92%

Cambrian Trilobites from the Parahio and Zanskar Valleys, Indian Himalaya

et al. 2009

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New collections of trilobites from the type section of the Parahio Formation in the Parahio Valley, Spiti, and from the Parahio, Karsha, and Kurgiakh formations in the Zanskar Valley, permit biozonation based on material precisely located within measured stratigraphic sections. Specimens preserved in limestone with mild tectonic deformation clarify the features of several Himalayan taxa known previously only from severely deformed specimens preserved in shale. A total of 75 trilobite taxa from the Cambrian of Spiti and Zanskar can be referred, questionably at least, at the generic level or below, and 61 of these are present in our new collections. This new material is assigned with confidence to 29 existing species, and to 12 new species. Three new genera,Haydenaspis, Bhargavia, andHimalisania, are established; new species includeHaydenaspis parvatya, Prozacanthoides lahiri, Probowmania bhatti, Xingrenaspis parthiva, X. shyamalae, Bhargavia prakritika, Kaotaia prachina, Gunnia smithi, Sudanamonocarina sinindica, Proasaphiscus simoni, Koldinia odelli, andTorifera jelli. Ten additional Himalayan forms are assigned at the generic level only, and another 11 are questionably assigned to genera or species. The zonation proposed includes 6 zones and 3 levels, including theHaydenaspis parvatyalevel, theOryctocephalus indicuslevel, theKaotaia prachinaZone, theParamecephalus defossusZone, theOryctocephalus salteriZone, theIranoleesia buteslevel, theSudanomocarina sinindicaZone, theLejopyge acanthaZone, and theProagnostus bulbusZone. The sections span from the upper part of the informal Stage 4, Series 2 of the Cambrian System, about 511 Ma old, to theProagnostus bulbuszone of the Guzhangian Stage near the top of Series 3, dated at about 501 Ma. This time interval is represented by about 2000 m of section, which is thick compared to similar intervals elsewhere and is consistent with high rates of sedimentation along the Himalayan margin at the time. The fauna resembles others from equatorial peri-Gondwanaland, with closest similarity to that of South China. It also bears strong affinity to the North China fauna. Juvenile trilobites are described for the first time from India. A new Chinese species,Monanocephalus liquani, is also described.

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Section: Biostratigraphy and Global Correlationmentioning

confidence: 92%

Cambrian Trilobites from the Parahio and Zanskar Valleys, Indian Himalaya

et al. 2009

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“…3; Westergård 1950;Martinsson 1965). Trace fossils occur abundantly (Martinsson 1965;Schlirf & Bromley 2007), Geyer & Shergold (2000), Axheimer & Ahlberg (2003) and Axheimer et al (2006); see also text for discussion.…”

Section: Articlementioning

confidence: 98%

The Middle Cambrian Paradoxides paradoxissimus Superzone on Öland, Sweden

Weidner¹,

Nielsen²

2009

GFF

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Trilobites from the Middle Cambrian Paradoxides paradoxissimus Superzone on Ö land are reviewed, including species found in glacial erratic boulders in Germany and Denmark. The fauna recorded contains 20 species including 10 agnostids. The succession, up to 70 m thick, comprises the Ä leklinta Member of the Borgholm Formation (previously known as the Paradoxissimus sandstone or siltstone) and a thin overlying conglomerate, here informally referred to as the Mörbylilla conglomerate, forming the base of the Alum Shale Formation. The thin Granulata Conglomerate, including a limestone layer previously correlated with the Exsulans Limestone, forms the base of the Ä leklinta Member. It has yielded several species characteristic of the Triplagnostus gibbus Zone, e.g. Ctenocephalus exsulans, Bailiella tenuicincta, Solenopleura parva, Parasolenopleura aculeata and T. gibbus. The Ä leklinta Member contains T. gibbus, Ellipsocephalus lejostracus and P. aculeata, all indicative of the T. gibbus Zone. The overlying Mörbylilla conglomerate contains reworked (?) specimens of E. lejostracus and T. gibbus associated with Acidusus atavus, Tomagnostus fissus, Ptychagnostus affinis, Onymagnostus hybridus, Tomagnostella cf. truncata, Hypagnostus parvifrons and H. mammillatus. Most of these agnostids are found in small stinkstone pockets within the conglomerate. Tomagnostus bothrus? is recorded in Scandinavia for the first time. The fauna shows that the conglomerate represents the A. atavus Zone. The stinkstone pockets indicate that the conglomerate was deposited under dysoxic "Alum Shale" conditions. In the beach section at Mörbylilla, the 0.16 m thick Mörbylilla conglomerate is overlain by an anthraconite bed, up to 0.6 m thick, representing the Exporrecta Conglomerate Bed.

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“…Among them, nos. 15-24 agnostid biozones are considered by colleagues as the international standards [43,44] ; the FADs of L. laevigata and G. reticulatus are stratotype points defining the bases of Paibian Stage and Guzhangian Stage respectively in the global Cambrian System; the index fossils A. orientalis and L. americanus are voted by the members of the International Subcommission on Cambrian Straitgraphy (ISCS) as the key species for defining the global Cambrian Stage 9 and 10 respectively [45] . Besides, the A. trisulcatus-P. anabarica biozone and W. crosbyi biozone in the Diandongian Series and the A. chauveaui biozone and O. granulata-B.…”

Section: The Revised Cambrian Biostratigraphic Succession Of South Chinamentioning

confidence: 99%

The newly-developed Cambrian biostratigraphic succession and chronostratigraphic scheme for South China

Shanchi

2009

Chin. Sci. Bull.

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Biostratigraphy and chronostratigraphy are common means of subdividing rock strata. The biostratigraphic succession and chronostratigraphic scheme are regarded as the basis for the subdivision and correlation of regional and global stratigraphic units. This paper reviews research on the biostratigraphy and chronostratigraphy carried out in the Jiangnan Slope Belt, South China since 1978, and, in particular, the biostratigraphic succession and chronostratigraphic scheme developed in the last decade. The updated biostratigraphic succession of South China includes 36 biozones, the base of each of which is defined by the first appearance of a single taxon (index fossil), and a poorly fossiliferous interzone. The updated chronostratigraphic scheme of South China comprises 4 series and 10 stages, embracing 3 global chronostratigraphic units, the Guzhangian Stage, Furongian Series, and Paibian Stage, and 2 GSSPs, all of which are erected in northwestern Hunan and 2 International Tie Points recognized in sections also in northwestern Hunan and each was accepted by the International Subcommission on Cambrian Stratigraphy for defining the base of the global stage. The biostratigraphic and chronostratigraphic systems are recognized as Chinese standards both domestically and worldwide. Future research is suggested for improving the two sets of stratigraphic standards.

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The middle Cambrian cosmopolitan key species Lejopyge laevigata and its biozone: new data from Sweden

Cited by 32 publications

References 26 publications

Cambrian Trilobites from the Parahio and Zanskar Valleys, Indian Himalaya

Cambrian Trilobites from the Parahio and Zanskar Valleys, Indian Himalaya

The Middle Cambrian Paradoxides paradoxissimus Superzone on Öland, Sweden

The newly-developed Cambrian biostratigraphic succession and chronostratigraphic scheme for South China

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