Remarks on the stratigraphy and character of the Ordovician conodont fauna of Thuringia

Fuchs, Arnold

doi:10.1127/njgpm/1990/1990/193

Cited by 6 publications

(6 citation statements)

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“…5). Refinement of the age comes from the compo s ition of the conodont assemblage, which allows for biostratigraphic correlation with the Kalkbank of Thuringia (Knüpfer 1967, Fuchs 1990, Ferretti & Barnes 1997, and the broadly coeval Sholeshook Limestone of Wales, which Ferretti et al (2014b) assigned to the lower A. ordovicicus Zone, in agreement with previous trilobite, graptolite, and chitinozoan data (Fig. 5).…”

Section: Biostratigraphy and Biofaciessupporting

confidence: 77%

“…Based on its composition, the Casaio conodont fauna is ascribed to the Mediterranean Province of Sweet & Bergström (1984), with locally abundant faunas of low diversity, characteristic of Late Ordovician polar to subpolar regions. It shares the typical species association of the Sagit todontina robusta-Scabbardella altipes Biofacies, which is known from Thuringia (Knüpfer 1967, Fuchs 1990, Ferretti & Barnes 1997, Libya (Bergström & Massa 1992), Portugal (Sarmiento et al 2001), Spain (Carls 1975, Sarmiento et al 2011, and NW France (Paris et al 1981, Ferretti et al 2014a, though with a different frequency distribution of the conodont species. The Carnic Alps, an important sector of the peri-Gondwana Mediterranean Province characterized by the Hamarodus europaeus-Dapsilodus mutatus-Scabbardella altipes Biofacies (Serpagli 1967, Bagnoli et al 1988, Ferretti & Schönlaub 2001, is linked with the conodont assemblage from the Casaio Formation by the common occurrence of Amorphognathus, Drepanoistodus, Hamarodus, Icriodella, Panderodus, Sagittodontina and Scabbardella.…”

Section: Biostratigraphy and Biofaciesmentioning

confidence: 94%

“…8C, E), based on Libyan specimens, and suggested a similar oral-architecture to Amorphognathus. Fuchs (1990) reconstructed the apparatus of Sagittodontina after analysing the original collection of Knüpfer (1967) and additional material from Thuringia. Bergström & Massa (1992) discussed and illustrated the Libyan collection as Sagittodontina robusta (Fig.…”

Section: Walliserodus Cf Debolti Serpagli 1967mentioning

confidence: 99%

“…indentatus Rhodes (1953) as the Pb element in the oral reconstruction of A. superbus, a criterion followed by Savage & Bassett (1985). Fuchs (1990) referred Ambalodus triangularis var. indentatus Rhodes sensu Knüpfer (1967) as the Pb element of Sagittodontina robusta.…”

Section: Walliserodus Cf Debolti Serpagli 1967mentioning

confidence: 99%

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Taxonomy, biostratigraphy and biofacies of an Upper Ordovician (Katian) conodont fauna from the Casaio Formation, Northwest Spain

Voldman¹,

Toyos²

2019

Bull. Geosci.

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Although Katian conodont faunas from high-latitude Gondwanan to peri-Gondwanan regions are widely referred to in the literature, their taxonomy is not yet stabilised, which is critical to biostratigraphically constrain the climate and tectonic events preceding the Hirnantian mass-extinction. In the present contribution, 595 conodont elements and abundant fragmentary conodont material recovered from meta-limestones of the Casaio Formation, northern Central Iberian Zone, is taxonomically and biostratigraphically analysed. The conodont assemblage is characterised by the genera Amorphognathus, ?Baltoniodus, ?Drepanoistodus, "Drepanodus", Eocarniodus, Hamarodus, Icriodella, Istorinus, Panderodus, Sagittodontina, Scabbardella, and Walliserodus, and documents the lower Amorphognathus ordovicicus Zone (Ka3) in Northwest Spain. After the taxonomic analysis, Icriodella iberiensis sp. nov. is proposed, and the complexity of the balognathid genera Sagittodontina and Amorphognathus is further discussed. Based on the composition of the major components, a new Icriodella-Sagittodontina-Amorphognathus Biofacies is introduced. Conodont based correlations and cluster analysis verify the strong similarity of the conodont assemblage of the Casaio Formation with the Thuringian conodont faunas from the Upper Ordovician Mediterranean Province.

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Section: Biostratigraphy and Biofaciessupporting

confidence: 77%

Section: Biostratigraphy and Biofaciesmentioning

confidence: 94%

Section: Walliserodus Cf Debolti Serpagli 1967mentioning

confidence: 99%

Section: Walliserodus Cf Debolti Serpagli 1967mentioning

confidence: 99%

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Taxonomy, biostratigraphy and biofacies of an Upper Ordovician (Katian) conodont fauna from the Casaio Formation, Northwest Spain

Voldman¹,

Toyos²

2019

Bull. Geosci.

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“…A thin (0.1‐ to 0.4‐m‐thick) limestone bed, known as the Kalkbank, in the Schmiedefeld Formation in the otherwise clastic Upper Ordovician succession in south‐eastern Germany has yielded a conodont fauna of abundant specimens but of low species diversity (Knüpfer ; Sweet and Bergström ; Fuchs , ; Ferretti and Barnes ). Ferretti and Barnes () recognized in this fauna nine taxa identified to species and four additional ones referred only to genus.…”

Section: International Comparisonsmentioning

confidence: 99%

Katian (Upper Ordovician) conodonts from Wales

Ferretti¹,

Bergström

Barnes

2013

Palaeontology

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Middle and upper Katian conodonts were previously known in the British Isles from relatively small collections obtained from a few localities. The present study is mainly based on 17 samples containing more than 17 000 conodont elements from an approximately 14-m-thick succession of the Sholeshook Limestone Formation in a road\ud cut near Whitland, South Wales, that yielded a diverse fauna of more than 40 taxa. It is dominated by representatives of Amorphognathus, Aphelognathus/Plectodina and Eocarniodus along with several coniform taxa. Representatives of Decoriconus, Istorinus and Sagittodontina are reported from the Ordovician of UK for the first time. The fauna is a typical representative of the British Province of the Atlantic Realm and includes a mixture of taxa of North American, Baltoscandic and Mediterranean affinities along with pandemic species. Based on the presence of many elements of Amorphognathus ordovicicus and some morphologically advanced specimens of Amorphognathus superbus, the Sholeshook Limestone Formation is referred to the lower A. ordovicicus Zone. Most of the unit is also coeval with Zone 2 of the\ud Cautleyan Stage in the British regional stage classification, and stage slice Ka3 of the middle Katian Stage in the global stratigraphical classification, an age assignment consistent with data from trilobites, graptolites and chitinozoans. The unusually large collection of M elements of Amorphognathus provides insight into the complex morphological variation in this element of some Katian species of this genus. The Sholeshook conodont fauna is similar to those of the Crug and Birdshill limestones, but differs in several respects from the slightly older ones from the Caradocian type area in the Welsh Borderland. Although having some species in common, the Sholeshook conodont fauna clearly differs from coeval Baltoscandic faunas and is even more different in composition compared with equivalent North American Midcontinent faunas

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