bluuebunny/crossref_metadata_2025_split huggingface dataset:
Evaluation of the ishikawa cell line bioassay for the detection of estrogenic substances from sediment extracts
Authors: Hashimoto Shinya , Akatsuka Yoko , Kurihara Ryo , Matsuoka Sumiko , Nakatsukuri Maiko , Kurokawa Yuko , Tani Yukinori , Kawai Shin'ichiro 
Published: June 2005

Abstract
This study examines the application of Ishikawa human endometrial adenocarcinoma cells to measure the estrogenic activity of fractionated extracts of sediments from Tokyo Bay, Japan. Estrogen stimulates alkaline phosphatase activity in this cell line. The results of these assays were compared with those of a yeast estrogen screen (YES) assay. The Ishikawa cell line bioassay showed higher sensitivity to 17β-estradiol (median effective concentration [EC50], 10.7 pM) than did the YES assay (EC50, 480 pM). Fractionation of sediment extracts (all samples collected from 5 sites) showed that the nonpolar fraction was poisonous to yeast cells; the estrogenic activity of this fraction, therefore, could not be measured by YES. However, the nonpolar fraction did not kill the Ishikawa cells. The 17β-estradiol-equivalent values of 15 extracts (3 fractions from each of 5 sediment samples) ranged from 5.7 to 697 pg/g dry weight according to the Ishikawa cell line bioassay. Chemical analysis using gas chromatography-mass spectrometry revealed that the highest concentrations of endocrine-disrupting chemicals were observed at the sampling station near the sewage treatment plant. The results support that the Ishikawa cell line bioassay is suitable for measuring the estrogenic activity of sediment samples.
A new pycnodontiform fish from the Early Cretaceous of Las Hoyas (Cuenca, Spain)
Authors: Poyato-Ariza Francisco Jose , Wenz Sylvie 
Published: June 2005

Abstract
Stenamara mia is a new genus and species of a rare pycnodontiform fish from the Barremian, early Cretaceous, lacustrine beds of Las Hoyas, province of Cuenca, Spain. It was previously considered Eomesodon sp., but a number of characters clearly separates it from the genus Eomesodon: lack of prognathism; absence of nuchal plates; presence of a parietal process and of only two rows of teeth in the prearticular; and peltate pattern of ossification and distribution of scales, that is, scales are present only before the level of the unpaired fins, and are complete only in the ventralmost abdominal area. The unique combination of these and other characters, plus the following autopomorphies, diagnoses the new taxon: presence of a strongly curved dorsal prominence that results in an ovoid shape of the contour of the body; body deeper than long, with maximum body height near 125% of standard length; and narrow, high cloaca formed by only two differentiated scales, the posterior one considerably longer than the anterior one. Stenamara mia nov. gen. nov. sp. is considered a primitive Pycnodontidae, pending a cladistic analysis to determine precisely its phylogenetic relationships.
Evolution des particules d'or en milieu lateritique soudano-sahelien; alluvions et colluvions dans l'environnement d'un gite filonien, Piela, Burkina Faso
Authors: Ouangrawa Mariam , Grandin Georges , Parisot Jean-Claude , Delaune Mireille 
Published: June 2005

Abstract
On a barren bedrock, transported auriferous materials of colluvial and alluvial origin present differences in the distribution, composition and morphology of gold particles. Under Sudano-Sahelian conditions, transport processes shape evolved particles in short distances.
Trishear kinematic model of fault-propagation folding and sequential development of minor structures; the Oupia Anticline (NE Pyrenees, France) case study
Authors: Grelaud Sylvain , Buil Diego , Hardy Stuart , Frizon de Lamotte Dominique 
Published: June 2005

Abstract
The Oupia anticline is a fault-propagation fold located at the northeastern tip of the Pyrenees. We show that this structure is suitably modelled using the trishear kinematic model rather than the self-similar kink-band model. In particular, the trishear model accounts well for the change in forelimb dip along strike as well as for sequential overall thickening and then thinning of the forelimb deduced from microtectonic analysis.
Where should the Global Stratotype Section and Point (GSSP) for the Paleocene/Eocene boundary be located?
Authors: Aubry Marie-Pierre 
Published: June 2005

Abstract
The Working Group (WG) on the Paleocene/Eocene (P/E) boundary will soon have to submit a formal proposal regarding the selection of a GSSP for the boundary. Before it proceeds, a number of critical points must be considered. First, there has been dual definition of the Paleocene/Eocene boundary so that even today the boundary is placed at two different lithostratigraphic horizons by marine and vertebrate paleontologists. The former use the base of the Ypresian Stage = Mont Heribu Member in the Belgium Basin whereas the latter use the Conglomerat de Meudon believed until recently to lie at the base of the Sparnacian Argile plastique of the Paris Basin. A historical review of the definitions of the terms that have become accepted as standard chronostratigraphic units help to explain how this dual definition arose and to show that the definition accepted by most vertebrate paleontologists is spurious. The current placement of the Paleocene/Eocene boundary, i.e., defined by the base of Ypresian Stage (Ieper Clay), conforms to the definition of the Paleocene by Schimper in 1874. Second, the WG must determine whose basic chronostratigraphic procedures to follow. There has been in recent years a profound shift in chronostratigraphic procedures so that the fundamental principles recognized by the International Subcommission on Stratigraphic classification [ISSC, Hedberg, Ed, 1976; Salvador, Ed., 1994] are difficult to reconcile with the rules published by the International Commission on Stratigraphy (ICS) in recent years, based on the precept that "correlation precedes definition". For this reason the WG finds itself in a dilemma, and must weigh the risks associated with the attractive solution that would consist in defining the P/E boundary by a lithostratigraphic level where the late Paleocene carbon isotope excursion (CIE) is recorded. Four possible options that may satisfy Hedberg's principle of chronostratigraphy and/or the need for recognizing globally the Paleocene/Eocene boundary are presented. Whichever option is followed, it is important to remember that chronostratigraphy must remain objective and as arbitrary as possible, and thus independent of any aspect of Earth history, either paleobiologic, tectonic or climatic. In addition, in making a proposal for the definition of the P/E boundary, the WG must ensure that its choice will not contribute to a destabilisation of the current chronostratigraphic framework.
Calcareous nannofossil turnover around the Paleocene/Eocene transition at Alamedilla (southern Spain)
Authors: Monechi Simonetta , Angori Eugenia , von Salis Katharina 
Published: June 2005

Abstract
A high resolution biostratigraphic study of calcareous nannofossil assemblages has been performed on the Alamedilla section in southern Spain across the Paleocene/Eocene transition. The identification of numerous and well differentiated events together with a major calcareous nannofossil turnover suggest the Alamedilla section to represent one of the most expanded and continuous sections straddling the P/E boundary. Quantitative analyses have revealed a change in the species richness and fluctuations in abundance of important paleoecological species.
Conditions et ages 40 Ar/ 39 Ar de mise en place des granitoides de la zone externe sud du Massif central francais; exemple des granodiorites de St-Guiral et du Liron (Cevennes, France)
Authors: Najoui Khalid , Leyreloup Andre Francois , Monie Patrick 
Published: June 2005

Abstract
The St-Guiral and the Liron laccolithic granodiorites outcropping in the southeastern area of the French Massif Central intrude the Cambro-Ordovician low grade series of the western Cevennes. The petrological study of their contact aureoles shows that these plutons emplaced at low depth (1-2 kb; 690-700 degrees C). The laser probe 40 Ar/ 39 Ar allows us to suggest a minimum age of 324 Ma for the emplacement of the St-Guiral granodiorite. This emplacement seems synchronous with the LP-HT regional metamorphism in the western Cevennes for which the cooling ages are identical. The Liron granodiorite (310 Ma) is younger and crosscuts the thermal structures of the LP-HT regional metamorphism. Accordingly these plutons emplaced at the Namurian-early Westphalian during the extensional phases related to the generalised gravitational collapse of the previously thickened Hercynian belt. The detachment of the subducted lithosphere (slab detachment) could be related to these phenomena and could explain the granitization of the south external area of the Hercynian belt as well as the migration of the magmatism towards the south of the belt.
La diagenese des otolithes par la comparaison des donnees microstructurales, mineralogiques et geochimiques; application aux fossiles du Pliocene du Sud-Est de la France
Authors: Dufour Elise , Cappetta Henri , Denis Alain , Dauphin Yannicke , Mariotti Andre 
Published: June 2005

Abstract
Microstructure, mineralogy and elemental and isotopic compositions of recent and fossil otoliths have been investigated. Fossil otoliths come from marine Pliocene localities of southeastern France. The study of the different parameters show that diagenetic changes are weak. Microstructural features specific to otoliths, such as needle-like crystals and growth increments, are usually well preserved. When present, the microstructural modifications remain limited inside each otolith. Except a few pyritic specimens, the only mineral found is aragonite like in recent specimens. The chemical compositions of fossil and recent otoliths are not significantly different, and any element is preferentially changed by diagenesis. The isotopic composition does not show strong alterations. However, the difference in 18 O content between recent fishes having different ecological habits is not found with the same magnitude in fossil specimens. Finally, when elemental and isotopic compositions are compared, the specimens are sorted according to taxonomy and not according to their geologic age. This suggests that biogenic signals have been preserved.
The Jurassic Thalattosuchia (Crocodyliformes) of Chile; a paleobiogeographic approach
Authors: Gasparini Zulma , Vignaud Patrick , Chong Guillermo 
Published: June 2005

Abstract
The thalattosuchian fossils from the Jurassic of Chile are revised. Some specimens, dating from the Lower Lias (Sinemurian), are the oldest known thalattosuchians, but are too fragmentary to establish a precise taxonomic placement. New specimen related to the genus Metriorhynchus is described from the lower Bajocian. It is the oldest representative of the genus and fills an important gap in our knowledge of the paleogeographic history of this group. Other new cranial fragments, related to the Callovian species Metriorhynchus casamiquelai, are described and this species is revised in the light of new studies on the intraspecific variability in extant crocodilians. Up until now, the known distribution of Liassic Thalattosuchia suggested a circumpacific distribution with minimally episodic passages through the Caribbean Corridor. Nevertheless, the close affinities between the South American and the European Metriorhynchidae from the Callovian to the Tithonian suggest the possibility that more and more frequent communications were made via the Caribbean Corridor. The new data corroborate the hypothesis formulated from the invertebrate faunas.
Le karst des plateaux jurassiques de la moyenne valee de l'Ardeche; datation par paleomagnetisme des phases d'evolution plio-quaternaires (aven de la Combe Rajeau)
Authors: Audra Philippe , Camus Hubert , Rochette Pierre 
Published: June 2005

Abstract
Thanks to its immunity, karst is an excellent recorder of environmental change, which also offers the possibility for dating. Karst records position of old base levels, in particular to which were linked horizontal underground drains located near the piezometric surface. After a base level lowering, a new drain appears at a lower level, the old perched drain being abandoned. If base level lowering is slow, the initial drain is progressively entrenched, forming a canyon. The "Combe Rajeau" cave system corresponds to this last type: a 100 m high underground canyon, continuously entrenched during the Ardeche valley downcutting. The underground river left several terraces during the entrenchment. Knowing that speleothem U/Th radiometric dating method covers only the most recent part of karst systems history, which spans over several million years, paleomagnetism has been applied to date the Combe Rajeau sediments. A more precise knowledge of the evolution phases of this system provides a better understanding of the middle Ardeche valley evolution upon which it depends.
Apports de l'etude isotopique Sr et Nd des sediments cenozoiques de Limagne a la comprehension du fonctionnement du rift du Massif central francais
Authors: Briot Danielle , Poidevin Jean-Louis , Hugueney Marguerite 
Published: June 2005

Abstract
Radiogenic isotope geochemistry of shales, siliciclastics and carbonates potentially provides important information on the evolution of reservoirs such as continental crust or seawater. The aim of this study is to show that Sr and Nd isotope compositions of Cenozoic sediments and fossil remains in rift-related basins of the Massif Central can be used to contribute to a better understanding of rifting processes. Two questions are of particular relevance: firstly, did the volcanic activity which started during Eocene in the Massif Central continue through Oligocene, if so it would only be visible in sediments? Secondly, did the sedimentation occur in basins directly connected with seawater or in isolated lakes?
Correlations et interpretations genetiques dans les formations recifales oxfordiennes de la haute vallee de l'Yonne (sud-est du bassin de Paris, France)
Authors: Chevalier Francis , Garcia Jean-Pierre , Quesne Didier , Guiraud Michel , Menot Jean-Claude 
Published: June 2005

Abstract
Novel palaeoenvironmental interpretations and high-resolution correlations in Oxfordian reefal formations (fig. 1, 2) are provided by genetic stratigraphy. The main objectives of this study are: (1) to determine environmental conditions and the zonation of depositional environments; (2) to propose a genetic sequence framework and correlations of the outcrop sections; (3) to evaluate a possible tectonic control on coral buildup settlement and growth both at local scale.
Datation de surfaces geomorphologiques reperes par le 10 Be produit in-situ; implications tectoniques et climatiques
Authors: Siame Lionel L. , Braucher Regis , Bourles Didier L. , Bellier Olivier , Sebrier Michel 
Published: June 2005

Abstract
The evolution of continental landforms is mainly modulated by the impact of climatic and tectonic processes. Because of their distinctive morphology and the periodicity of their deposition, climatically induced landforms such as alluvial fans or terraces are well suited to infer rates of tectonic and continental climatic processes. Within tectonically active regions, an important step consists in dating displaced geomorphic features to calculate slip rates on active faults. Dating is probably the most critical tool because it is generally much more simpler to measure deformation resulting from tectonic activity than it is to accurately date when that deformation occurred. Recent advances in analytical chemistry and nuclear physics (accelerator mass spectrometry) now allow quantitative abundance measurements of the extremely rare isotopes produced by the interaction of cosmic rays with surface rocks and soils, the so-called in situ-produced cosmogenic nuclides ( 3 He, 10 Be, 21 Ne, 26 Al, 36 Cl), and allow to directly date the duration that a landform has been exposed to cosmic rays at the Earth's surface [Lal, 1991; Nishiizumi et al., 1993; Cerling and Craig, 1994; Clark et al., 1995]. In fact, the abundance of these cosmonuclides is proportional to landscape stability and, under favorable circumstances, their abundance within surface rocks can be used as a proxy for erosion rate or exposure age. These cosmonuclides thus provide geomorphologists with the opportunity to constrain rates of landscape evolution. This paper presents a new approach that combines cosmic ray exposure (CRE) dating using in situ-produced 10 Be and geomorphic as well as structural analyses. This approach has been applied on two active strike-slip and reverse faults located in the Andean foreland of western Argentina. These two case studies illustrate how CRE dating using in situ-produced 10 Be is particularly well suited for geomorphic studies that aim to estimate the respective control of climate and tectonics on morphogenesis.
Paleocene/Eocene transition in the northeastern Peri-Tethys area; Sokolovskii key section of the Turgay Passage (Kazakhstan)
Authors: Radionova E. P. , Khokhlova I. E. , Beniamovskii V. N. , Shcherbinina E. A. , Iakovleva A. I. , Sadchikova T. A. 
Published: June 2005

Abstract
Lithology, microfossils, and stratigraphy of the uppermost Paleocene - lowermost Eocene predominantly terrigenous and siliceous sediments from the Sokolovskii section located in the Turgay Passage, northern Kazakhstan, were studied. Among the microfossils, calcareous nannofossils, radiolarians, and especially dinocysts proved to be useful for age determinations, correlation with standard zonal schemes, and for paleoecological reconstructions. The NP8 (Heliolithus riedelii) nannoplankton Zone, the Acarinina subsphaerica and A. acarinata (lowermost part) planktonic foraminifera Zones, the Petalospyris foveolata regional radiolarian Zone, the Moiseivia uralensis diatom Zone were recognised, as well as four dinocysts zones: the Alisocysta margarita, Apectodinium hyperacanthum, A. augustum, and Wetzeliella meckelfeldensis Zones. Also, two transgressive-regressive cycles are distinguished. They are interrupted by short hiatuses; the upper one corresponds to the boundary between the Apectodinium augustum and Wetzeliella meckelfeldensis dinocyst Zones.
Stratigraphie sequentielle de l'Aptien du sous-bassin de Galve (Province de Teruel, NE de l'Espagne)
Authors: Vennin Emmanuelle , Aurell Marc 
Published: June 2005

Abstract
A correlation is established in a north-south transect based on continuous outcrops. Considering the different reference surfaces and the geometry, three major depositional sequences can be distinguished which can be subdivided into a complex arrangement of parasequences. These third-order sequences are composed of a lower retrogradational and an upper progradational trends. The first sequence contains orbitolinid bioaccumulations in the retrogradational trend and oolitic-bioclastic shoals in the progradational trend. The second sequence exhibits, from bottom to top, a transgressive, a regressive and a forced-regressive trends. Ammonite-rich marls characterise the transgressive trend, whereas bioconstructions rich in coral-chaetetids-microbialites are abundant in both regressive and forced-regressive trends. The maximum flooding of this sequence is widely distributed across the whole Iberian platform. Finally, the third sequence shows the installation of homogeneous rudistid bioaccumulations in a retrogradational and a progradational trends. Each major sequence boundary marks a community replacement, whose respective fossil associations are dominated by (1) orbitolinids, (2) corals-microbialites, (3) corals-chaetetids-microbialites, and (4) rudists.
Stratigraphie sequentielle du Dinantien type (Belgique) et correlation avec le Nord de la France (Boulonnais, Avesnois)
Authors: Hance Luc , Poty Eddy , Devuyst Francois-Xavier 
Published: June 2005

Abstract
The relative influences of local tectonics and global eustasy in the architecture of the sedimentary units of the Namur-Dinant Basin (southern Belgium) are determined. Nine third-order sequences are recognised. During the Lower Tournaisian (Hastarian and lower Ivorian) a homoclinal ramp extended from southern Belgium through southern England (Mendips) and into southern Ireland. From the upper Ivorian to the lower Visean rapid facies changes occurred due to progradation and increasing prominence of Waulsortian mudmounds. Progradation gradually produced a situation in which inner shelf facies covered the Namur (NSA), Condroz (CSA) and southern Avesnes (ASA) sedimentation areas, whereas outer shelf facies were restricted to the Dinant sedimentation area (DSA). During the middle and late Visean a broad shelf was established from western Germany to southern Ireland. Because the shelf built up mainly by aggradation, parasequences can be followed over a large area. An early phase of Variscan shortening is perceptible during the Livian. The stratigraphic gap between the first Namurian sediments (E2 Goniatite Zone) and the underlying Visean varies from place to place, but is more important in the north.
Mise au point d'un protocole experimental de separation granulometrique d'assemblages de nannofossiles calcaires; applications paleoecologiques et geochimiques
Authors: Minoletti Fabrice , Gardin Silvia , Nicot Elisabeth , Renard Maurice , Spezzaferri Silvia 
Published: June 2005

Abstract
Calcareous nannofossils play an important role in biostratigraphy and paleoecology, though their study is often complicated by their reduced size. The methodology presented herein allows to separate the nannofossil assemblage into granulometrically and taxonomically homogeneous fractions. This method permits :a) the concentration of rare taxa in order to simplify their morphometric study; b) the geochemical analysis (stable isotopes and trace elements) of these fractions. The latter is helpful in many cases, especially when the analysis of major or minor taxa constituent of the assemblage is greatly complicated by the reduced particles dimensions. In this way, it will be possible to bring light to the ecological parameters of these taxa, as calcification temperature and other ecological requirements (salinity, nutrient concentrations).
A large Jurassic pterodactyloid in northern France and a review of the French pterosaur record
Authors: Knoll Fabien , Bouveur Alain 
Published: June 2005

Abstract
A very large mandible from the Jurassic (Lower Tithonian) of the Boulogne-sur-Mer area (Pas-de-Calais, France) is described. The specimen does not allow a precise identification but could be close to Gallodactylus canjuersensis within the Pterodactylidae. A tentative wingspan estimation of the taxon gives us a figure of about 2.5 m, which, if correct, would make it a remarkably large pterosaur for that time. An exhaustive review of the French pterosaur record is also presented. Although few remarkable finds have been reported, pterosaurs are known in France from a number of sites ranging in age from the late Triassic to the uppermost Cretaceous. The French record shows that the pterosaur stratigraphical concentrations are unlikely to be related to actual pterosaur palaeoecological importance during the Mesozoic. The apparent diversity of this group through time constitutes therefore a very unsuitable element to bring arguments, in either one way or another, to the mass extinction debate.