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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...
Long-term morphological changes were investigated in the conodont genus Palmatolepis, using a Fourier analysis of the outline of platform elements. Three time-slices and four Late Frasnian - Early Famennian sections on North Gondwana were studied. No difference existed between locations, but shape variations were recorded associated with the successive Kellwasser events. The Middle Famennian period...
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...
The space of Devonian time considered in this paper corresponds to the uppermost part of the Famennian or the latest Famennian as a fourfold subdivision of the stage, usually called by many authors Strunian in neritic facies and Wocklumeria Stufe or Wocklumian in pelagic facies. Here, we examine the biostratigraphical value of certain brachiopod genera and species as bio-markers of the uppermost Famennian...
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...
La region de Sao Raimundo Nonato (Piaui, Nordeste Bresilien) a livre une cinquantaine de restes de Macraucheniidae. L'etude de ce materiel et d'autres fossiles provenant egalement du Nordeste bresilien (Paraiba, Pernambuco, Rio Grande do Norte) montre que cet animal est tres semblable a Macrauchenia patachonica defini en Argentine. Le binome Xenorhinotherium bahiense cree en 1988 par Cartelle et Lessa...
L'etude detaillee d'un echantillon de << Pecten (Amussiopecten) benoisti >> Cossmann et Peyrot, 1914, des gisements chattiens du bassin de l'Adour a permis de mieux cerner cette espece assez mal connue et de montrer son importante variabilite, notamment au niveau de l'ornementation. Elle nous a aussi amenes a eclaircir certains points de nomenclature sur le plan generique : nous infirmons...
The Middle Awash paleontological study area, located in the Afar Rift of Ethiopia, has yielded fossils spanning the last six million years. The geology and geochronology of the Mio-Pliocene sites of the study area have been refined and a reliable chronostratigraphy has been established by 40 Ar/ 39 Ar radiometric dating. The latest Miocene Adu-Asa Formation is divided into...
The most northerly known Emsian crinoids were located at approximately 45 o to 50 o N latitude. They are the first Devonian crinoid cups discovered in Mongolia. Specimens are reported from excellent exposures of the informally designated crinoidal beds in the upper part of the stratotype section of the Chuluun Formation, between N44 o 22.119', E99 o 27.130' and N44...
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