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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. 1. — Micropora mikesmithi n in Cretaceous microporid cheilostome bryozoans from the Campanian historical stratotype of southwest France
FIG. 1. — Micropora mikesmithi n. sp.: A-C, paratype, NHMUK PI BZ 8363, Aubeterre Fm, rock face behind car-park, Aubeterre-sur-Dronne, Charente: A, part of the colony; B, group of autozooids with avicularia distal of the orifices; C, autozooid at the growing edge; D-E, holotype, NHMUK PI BZ 8809, Aubeterre Fm, Archiac, Charente-Maritime: D, part of the colony; E, three ovicellate autozooids lacking an associated avicularium, and one infertile autozooid (left) with an avicularium; F, paratype, NHMUK PI BZ 8655, Aubeterre Fm, roadcutting at junction of D5 and C18, east of Saint-Privat-des-Prés, Dordogne, orifice and avicularium. Scale bars: A, D, 500 μm; B, E, 200 μm; C, F, 100 μm.
FIG. 3 in Cretaceous microporid cheilostome bryozoans from the Campanian historical stratotype of southwest France
FIG. 3. — Dimorphomicropora voigti Ducasse & Vigneaux, 1960: A, lectotype, UB C.B.993 (Ducasse & Vigneaux 1960: fig. 1), probably Aubeterre Fm, Meschers, Charente-Maritime, branch with large polymorphic zooid near base; B, E, F, NHMUK PI BZ 8767, Aubeterre Fm, Pointe de Suzac, Meschers; B, branch; E, autozooids near base of branch; F, detail of an orifice; C, G, NHMUK PI BZ 8768, Aubeterre Fm, Pointe de Suzac, Meschers; C, branch with a large polymorphic zooid near the centre; G, detail of polymorph; D, paralectotype, UB C.B.994 (Ducasse & Vigneaux 1960: fig. 2), probably Aubeterre Fm, Meschers, Charente-Maritime; H, NHMUK PI BZ 8769, Aubeterre Fm, Pointe de Suzac, Meschers, Charente-Maritime, dilated branch with a cluster of ovicellate zooids. Scale bars: A, B, C, D, H, 500 μm; E, 200 μm; F, G, 100 μm.
FIG. 4 in Cretaceous microporid cheilostome bryozoans from the Campanian historical stratotype of southwest France
FIG. 4. — Dimorphomicropora crestulata (Ducasse, 1958): A, holotype (Ducasse 1958: pl. 7, fig. 3), UB C.B.917 Ducasse Collection, probably Barbezieux Fm (foram biozone CVI), RN 730, close to police station, Mirambeau, Charente-Maritime, dilated branch with ovicellate zooids; B, C, NHMUK PI BZ 8271, Aubeterre Fm, cliff north of town, Meschers, Charente-Maritime; B, well-preserved branch; C, detail of autozooids; D, NHMUK PI BZ 8272, Aubeterre Fm, cliff north of town, Meschers, branch. Scale bars: A, 500 μm; B, C, D, 200 μm.
FIG. 2. — Platelinella solea n. gen. et n in Cretaceous microporid cheilostome bryozoans from the Campanian historical stratotype of southwest France
FIG. 2. — Platelinella solea n. gen. et n. sp.: A-E, holotype, NHMUK PI BZ 8564, Biron Fm, Caillaud (north side), Talmont, Charente-Maritime: A, part of the colony; B, group of zooids; C, zooid with narrow distal opercular shelf; D, group of zooids, one with a slightly enlarged orifice (upper centre); E, broken zooid revealing two distal and two distolateral septular pores; F, paratype, NHMUK PI BZ 8848, Biron Fm, Caillaud (south side), Talmont, Charente-Maritime, group of zooids. Scale bars: A, 1 mm; B, D, F, 500 μm; C, E 100 μm.
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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Stratotype Bajocien
Modèle 3D en basse résolution du stratotype du Bajocien Acquisition faite le 16/11/2021 drone : Phantom 4 pro Source: Objaverse 1.0 / Sketchfab
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