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10 results for “Conodont faunas”
Conodont faunas across the Kasimovian–Gzhelian boundary (late Pennsylvanian) in South China and implications for the selection of the stratotype for the base of the global Gzhelian stage
The upper Pennsylvanian Naqing and Narao carbonate successions were deposited in intra-platform slope to basinal settings across the Kasimovian-Gzhelian boundary in Guizhou, South China. Conodont faunas comprise a mixture of the endemic taxa of the Idiognathodus luodianensis group and cosmopolitan species of the I. simulator group. The I. luodianensis group includes the new species I. fengtingensis, I. luodianensis, I. naqingensis and I. naraoensis. Platform landmark analysis demonstrates that the species of the I. luodianensis group differ in morphological features from co-occurring species of the I. simulator group. Both groups display similar increasing asymmetry in P1 element pairs across the Kasimovian-Gzhelian boundary, as recognized on the basis of the first occurrence of I. simulator. Many Kasimovian Idiognathodus species disappear and several Gzhelian species first appear with I. simulator, including two new species of Streptognathodus, S. nemyrovskae and S. zhihaoi. Just below the base of the Gzhelian, carbonate δ13C falls from 4‰ to 2‰ in both sections. The combination of an abrupt faunal turnover immediately above the prominent negative δ13C excursion might represent an oceanic event in South China, maybe recognizable on a global scale. One of these two South China sections may be the best location to place the GSSP for the base of the Gzhelian Stage.
Fig. 6 in Conodont faunas with Lenodus variabilis in the upper Arenigian to lower Llanvirnian of Sweden
Fig. 6. Relative abundance of major taxa in the samples for different areas and stratigraphic intervals. "Skåne" comprises samples from Killeröd and Tommarp, "Närke" samples from Lanna and Yxhult and "Dalarna" samples from Leskusänget and Kårgärde.
Fig. 2 in Conodont faunas with Lenodus variabilis in the upper Arenigian to lower Llanvirnian of Sweden
Fig. 2. Chronostratigraphic and biostratigraphic subdivisions in the Kundan. The interval investigated here,the L. variabilis and Y. crassus zones,approxi − mately equals the lower half (Da 1−2) of the Darriwilian Stage (Da 1−4).
Fig. 5 in Conodont faunas with Lenodus variabilis in the upper Arenigian to lower Llanvirnian of Sweden
Fig. 5. Stratigraphic ranges of key taxa in Swedish sections. The range of Scalpellodus latus applies to Finngrundet only; in other areas,except possibly in Jämtland, the species disappeared before the beginning of the L. variabilis Zone interval.
Fig. 4 in Conodont faunas with Lenodus variabilis in the upper Arenigian to lower Llanvirnian of Sweden
Fig. 4. Distribution of conodont elements in samples from Närke,Dalarna and Västergötland not previously presented. Samples with an asterisk (samp les D70−102, GB81−900, HK88−2 and HK88−3) represent the Y. crassus Zone; the remaining samples are from the L. variabilis Zone.
Fig. 8. Additional conodont elements from the upper L. variabilis and Y. crassus zones. A–D in Conodont faunas with Lenodus variabilis in the upper Arenigian to lower Llanvirnian of Sweden
Fig. 8. Additional conodont elements from the upper L. variabilis and Y. crassus zones. A–D. Yangtzeplacognathus crassus Chen and Zhang,1993 (in Ding et al. 1993) from samples Öl92−9 (A) and Öl87−3 (B–D), Y. crassus Zone,Gillberga quarry. A. Dextral Pa element,LO 8708t,× 50. B. Sinistral Pa element,LO 8707t,× 55. C. Dextral Pb element,LO 8710t,× 60. D. Sinistral Pb element,LO 8709t,× 40. E–I. Dzikodus hunanensis Zhang,1998b from samples HK88−3 (E, F, H) and HK88−2 (I),Hällekis quarry,and Öl93−8 (G),Gillberga quarry,all from the Y. crassus Zone. E. Sinistral juvenile Pa element,LO 8849t,× 90. F. Sinistral subadult Pa element,LO 8850t,× 50. G. Dextral? Pb element,LO 8851t,× 55. H. Sb element,LO 8852t,× 100. I. M element,LO 8853t,× 80. J–N. Parapanderodus quietus Bagnoli and Stouge,1997 from sample Öl87−1, L. variabilis Zone,Gillberga quarry. J. Slender element (?Sb),lateral view,LO 8854t, × 75. K. Slender element (?Sb),posterior−lateral view,LO 8855t,× 70. L. Small,laterally compressed element (?Sc),LO 8856t,× 100. M. Small,asymmetrical element (?Sd),LO 8857t,× 105. N. Bicostate element (?Sa),posterior view,LO 8858t,× 75. O–Q. Protopanderodus calceatus Bagnoli and Stouge,1997 from sample HK88−3,Hällekis quarry, Y. crassus Zone. O. Square−based asymmetrical element,LO 8804t,× 45. P. Short−based asymmetrical element,LO 8805t, × 60. Q. Scandodontiform element,LO 8806t,× 45. R–U. Protopanderodus rectus (Lindström,1955) from sample Vg98−4B, L. variabilis Zone,Österplana quarry. R. Scandodontiform element,LO 8807t,× 50. S. Short−based asymmetrical element,LO 8808t,× 55. T. Square−based acontiodontiform element,LO 8809t,× 50. U. High−based acontiodontiform element,LO 8810t,× 60. V–W. Parapaltodus simplicissimus Stouge,1984 from sample Öl87−3, Y. crassus Zone, Gillberga quarry. V. Scandodontiform element,LO 8829t,× 80. W. Drepanodontiform element,LO 8830t,× 45. X. Ansella jemtlandica (Löfgren,1978) from sample Öl87−3, Y. crassus Zone,Gillberga quarry,LO 8859t,× 110. Y, Z. Periodon flabellum (Lindström,1955),late form from sample Öl87−3, Y. crassus Zone,Gillberga quarry. Y. Sb element,LO 8860t,× 80. Z. M element,LO 8861t,× 80. AA. Strachanognathus parvus Rhodes,1955 from sample Öl87−2, Y. crassus Zone,Gillberga quarry,LO 8862t,× 120. AB–AD. Costiconus mysticus (Barnes and Poplawski,1973) from sample GB81−900, E. crassus Zone, Gullhögen quarry. AB. Multicostate element,LO 8831t,× 100. AC. Geniculate element,LO 8832t,× 110. AD. Scandodontiform element,LO 8833t,× 80.
Data from: Conodont faunas across the Kasimovian–Gzhelian boundary (Late Pennsylvanian) in South China and implications for the selection of the stratotype for the base of the global Gzhelian Stage
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Fig. 3 in Conodont faunas with Lenodus variabilis in the upper Arenigian to lower Llanvirnian of Sweden
Fig. 3. Conodont element distribution in the samples from the Gillberga section.
Fig. 1 in Conodont faunas with Lenodus variabilis in the upper Arenigian to lower Llanvirnian of Sweden
Fig. 1. Location of areas (provinces) and sections in Sweden where samples have been taken.
Data from: Silurian (late Llandovery–Wenlock) conodont fauna and biostratigraphy from the Yanbian area of Sichuan province, south-west china
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