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Elements morphologically identical with those of the Llanvirnian species “Cordylodus” horridus Barnes & Poplawski have been encountered in the early Arenig Oepikodus evae Zone. They were found associated with elements of a Paroistodus species, and are clearly part of the same apparatus as these.
Des restes de cinq groupes fossiles (radiolaires, conodontes, foraminifères, ostracodes, microrestes de Vertébrés) ont été récoltés à partir d'un seul échantillon du Paléozoïque supérieur de Turquie. Si la datation (sommet du Tournaisien inférieur) et le milieu de sédimentation (profond) présentent un grand intérêt pour la géologie régionale, c'est surtout la coexistence de cinq groupes, non remaniés,...
Los hallazgos de gondolélidos en el Carbonífero Superior son escasos. Este trabajo se ocupa del estudiode tres especies de los géneros Gondolella y Neogondolella encontrados en tres secciones de la Zona Cantábrica (N. de España). La fauna consiste en elementos pectiniformes de Gondolella laevis Kossenko & Kozitskaya, Gondolella nov. sp. 1 y Neogondolella clarki (Koike). Tanto G. Laevis como N...
Some 2379 conodont specimens have been recovered from 50 samples through the 560 m thick BowanPark Group and the basal part of the Malachi's Hill Beds of Late Ordovician age, from the western side of the Molong high, in central New South Wales. These have been assigned to 32 species including three new species, Panderodus nodus nov. sp., Paroistodus? nowlani nov. sp. and Yaoxianognathus ani nov. sp...
L'analyse de deux séquences régionales de France, l'une du Dévonien en Montagne Noire et l'autre du Paléogène des phosphorites du Quercy, a permis de comparer l'évolution des diversités de deux groupes distincts, les conodontes marins et les mammifères terrestres. Les réponses identiques de ces deux groupes face à une crise indiquent qu'il existe un mécanisme commun, quelque soit le groupe systématique,...
In the fossil record, distinction between the two basic aspects of evolution, i.e. branching of evolutionarytrees (cladogenesis) and evolutionary transformations along lineages (phyletic evolution, “anagenesis”), is especially well visible. The process of allopatric speciation, presumably the most common, if not the only, way to split a lineage, cannot be recognised directly in any single geological...
Dans la succession silurienne du synclinorium de Moncorvo (NW de la Zone Centre Ibérique, Portugal), des lentilles calcaires ont livré, dans deux localités distinctes, les premiers conodontes siluriens du Portugal. Dans la première localité, Kockelella cf. variabilis, K., cf. absidata, Ozarkodina confluens, Oz. excavata et Pseudooneotodus beckmanni indiquent le Ludlow s.l. (ou peut-être le Wenlock...
The Jisu Honguer Formation (''Zhesi Formation'') is a North China marine carbonate unit of Permian age containing a mixed fauna of Tethyan, Boreal and endemic elements. The age of the Jisu Honguer Formation has been thought to range from Artinskian to Kazanian based on previous studies using mostly benthic macrofossils. A typical Mesogondolella aserrata conodont fauna is reported from the lower part...
Six Pragian-Emsian boundary sections in the Barrandian area, western of Prague, provided evidence of well detectable entries of Latericriodus fauna probably at the earliest Emsian beds (particularly Latericriodus bilatericrescens gracilis Bultynck). The chance to find icriodontid conodonts increases with latest part of Praha Fm., which is apparently of Emsian age, whereas polygnathids are sparsely...
Conodont elements from Palaeozoic strata (Ordovician, Devonian and Carboniferous) contain abundant evidence for presumed post-mortem colonisation by endolithic organisms. It is possible to distinguish several morphotypes of microcavities in conodont apatite, which show some morphological similarities to microborings in calcareous substrates. Some of them are believed to be produced by microendoliths,...
Middle Triassic conodont assemblages in the semi-closed Peri-Tethyan Germanic Basin comprise endemic forms, which evolved within the basin, and immigrants from the Tethys Ocean. Migration from the Tethys proceeded diachronously through three tectonically predisposed pathways (gates) and was controlled by relative sealevel changes recorded in depositional sequences of the Muschelkalk. In the Early...
Se han extraído por primera vez conodontos en la sección del río Cares, encontrándose 15 especies y 1 subespecie de conodontos carboníferos pertenecientes a 7 géneros, algunos de ellos referidos por primera vez en la Unidad de Picos de Europa. Los conodontos corresponden a varias zonas entre el Turnesiense superior y el Serpujoviense superior-Bashkiriense inferior. Además, la especie Idiognathodus...
Las LLacerias Section in the western part of the Picos de Europa Unit (Cantabrian Zone) in northern Spain offers the best (essentially continuous) Upper Moscovian-Kasimovian succession in the Pennsylvanian of the Cantabrian Zone. The section consists almost entirely of limestones, and conodonts are scarce in general, but some Myachkovian levels are significantly more productive. Most specimens recovered...
Stratigraphic sections and microfossils samples from the upper part of the “Graptolitic Shales-Orthoceras Limestones” and from the Camprodon Formation lying in the area of Camprodon, eastern Pyrenees, Spain, have been studied. Some beds at the top of the “Graptolitic Shales-Orthoceras Limestones” correspond to the Torres Member of the Rueda Formation, and conodont faunas, indicating a Lochkovian age,...
Vertebrate microremains from the Late Devonian–Early Carboniferous of the Carnic Alps are predominantly chondrichthyan, with minor placoderm and actinopterygian remains. The faunas are sparse and, with very few exceptions, occur only in conodont-rich pelagic limestones (Pramosio Limestone) representative of the palmatolepid-bispathodid conodont biofacies. Phoebodont and jalodont chondrichthyans, also...
An uppermost Permian–Lower Triassic biota of brachiopods, conodonts, algae and foraminifers from the Pamucak and Kokarkuyu formations at Çürük Dağ (Antalya, Turkey) is here described. The brachiopods belong to two different assemblages: a lower assemblage, early Wuchiapingian in age, with Spinomarginifera cf. S. helica, Spinomarginifera cf. S. iranica, Alatorthotetina sp. ind., Orthothetina sp. ind...
Dans ce travail sont étudiés des céphalopodes et des conodontes provenant de la zone de passage des Calcaires d’Aspe-Brousset aux Calcaires d’Iraty dans les Pyrénées centrales et occidentales. Leur présence permet de distinguer deux niveaux d’âges différents. Le plus ancien, daté du Viséen terminal ou du Serpoukhovien basal, renferme des spécimens jadis décrits comme Goniatites baylei Leymerie, 1957,...
The conodont fauna from the Devonian–Carboniferous Shahmirzad section, located in the Central Alborz Mountains (North Iran), have been studied mainly for biostratigraphic purposes. Some levels were barren of conodonts, whereas others yielded a not very abundant, but quite differentiated fauna. No conodonts have been found from the mainly terrigenous and shaly Geirud Formation, whereas representative...
This paper summarizes the results of investigations carried out in the Mokrá quarry since 2006 on the biostratigraphy of the Tournaisian-Visean (T-V) boundary interval. It also integrates previous results obtained by J. Kalvoda and collaborators. The main focus is on the boundary itself, but stratigraphically lower and higher levels have been investigated as well to provide a biostratigraphical context...
Successive growth stages of P1-elements in the Middle to early Late Triassic species Pseudofurnishius murcianus allows the observation of a detailed ontogeny. Besides the gradual enlargement of its curved blade and the growing number of its denticles, a small internal platform develops, eventually followed by an external one, both bearing denticles. The number of denticles on the blade and internal...
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