Academic literature on the topic 'Biostratigraphie – Éocène'
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Journal articles on the topic "Biostratigraphie – Éocène":
Toufiq, Abdelkabir, and Hugues Feinberg. "Biostratigraphie de la limite Éocène - Oligocène dans les nappes prérifaines (Maroc septentrional)." Géologie Méditerranéenne 14, no. 1 (1987): 53–63. http://dx.doi.org/10.3406/geolm.1987.1356.
Bismuth, Hector, Bruno Cahuzac, Armelle Poignant, Herman Jozef Frans Hooyberghs, Rakia Saïd-Benzarti, and Abderrahmane Trigui. "Biostratigraphie d’après les foraminifères et paléoenvironnements des séries post-Éocène du sondage ASHTART 28, golfe de Gabès (Tunisie)." Revue de Micropaléontologie 52, no. 4 (October 2009): 289–315. http://dx.doi.org/10.1016/j.revmic.2008.06.002.
Sztrákos, Károly. "Lithostratigraphie et biostratigraphie des formations paléocènes et éocènes entre Bayonne et Pau (SW France)." Revue de Micropaléontologie 48, no. 4 (November 2005): 257–78. http://dx.doi.org/10.1016/j.revmic.2005.06.002.
Gheerbrant, E., H. Cappetta, M. Feist, J. J. Jaeger, J. Vianey-Liaud Sudre, and B. Sigé. "Succession of faunas of vertebrates from the Upper Paleocene and the Early Eocene in the Ouarzazate basin (Morocco). Geological context, biostratigraphical and paleogeographical scope." Newsletters on Stratigraphy 28, no. 1 (February 3, 1993): 33–58. http://dx.doi.org/10.1127/nos/28/1993/33.
Van Eetvelde, Yoann, and Christian Dupuis. "Étude biostratigraphique et paléoenvironnementale des diatomées pyritisées de l'intervalle Paléocène supérieur–Éocène inférieur du sondage de Saint-Josse (France)." Geobios 38, no. 2 (March 2005): 269–82. http://dx.doi.org/10.1016/j.geobios.2003.10.006.
Dissertations / Theses on the topic "Biostratigraphie – Éocène":
Fornel, Du Roure de Paulin Élodie. "Reconstitution sédimentologique tridimensionnelle et simulation stratigraphique du système turbiditique éocène des grès d'Annot (Alpes méridionales)." Rennes 1, 2003. http://www.theses.fr/2003REN10081.
Marandat, Bernard. "Mammifères de l'Ilerdien moyen (Éocène inférieur) des Corbières et du Minervois (Bas-Languedoc, France) : systématique, biostratigraphie, corrélations." Montpellier 2, 1989. http://www.theses.fr/1989MON20201.
Carlsson, Veronica. "Artificial intelligence in radiolarian fossil identification : taxonomic, biostratigraphic and evolutionary implications." Electronic Thesis or Diss., Université de Lille (2022-....), 2023. http://www.theses.fr/2023ULILR092.
Micropaleontology is not only about studying the organisms themselves, rather understanding Earth's past environments, with applications ranging from biostratigraphy to paleoceanography as well as being able to study evolutionary changes within morphospecies in time and space. This field is facing numerous challenges, since the analysis of microfossils demands significant human effort and taxonomic expertise, often leading to inconsistencies in interpretations. This work focuses on the application of using Artificial Intelligence (AI), such as Artificial Neural Networks (ANNs), for automatic image recognition of tropical Atlantic middle Eocene radiolarians. Large datasets have been constructed, in order to train different neural networks and our results show that the neural networks can automatically classify several different classes of radiolarians down to a species level, as well as in many cases being able to identify closely related species and even evolutionary transition morphotypes. It has also been able to correctly identify less broken or blurry radiolarians. It was also successfully applied to automatic image recognition for a biostratigraphic work, which in general could detect more general ages or highly precise bio events. This work includes the use of the classical neural network approaches for analysing visual context such as Convolutional Neural Networks (CNNs) but also includes the use of Spiking Neural Networks (SNNs), which is not as commonly used for automatic image recognition, as CNNs. SNNs resulted in almost or equal amount of accuracy obtained as for CNNs, just that the use is more computational efficient and takes up less memory. There have also been some comparisons using traditional morphometric analyses, such as Linear Discrimination Analysis (LDA), giving approximately the same kind of results. Our research not only aims to simplify and speed up the analysis process but also helps in increasing the accuracy and consistency of micropaleontological interpretations, which eventually, will contribute to the high-resolution studies in order to understand Earth's past history
Meunier, Mathias. "Biodiversity, biostratigraphy, disparity and macroecology of middle Eocene radiolarians (Rhizaria) : insights to their biotic response to the Middle Eocene Climatic Optimum (MECO)." Electronic Thesis or Diss., Université de Lille (2022-....), 2023. http://www.theses.fr/2023ULILR078.
The Middle Eocene Climatic Optimum (MECO) is a global warming event that occurred ca. 40 Ma and temporarily interrupted the long-term Eocene cooling trend. Although the MECO represents one of the larger climatic disruptions of the Paleogene, its impact on the biosphere is still poorly understood. Based on a wide range of quantitative methods, this thesis aims to study the radiolarian paleodiversity dynamics and morphological disparity through the MECO, in order to gain a deeper understanding of the biotic perturbations associated with this climatic event. The taxonomic understanding of middle Eocene radiolarian species was first clarified, by documenting at the species level two well-preserved radiolarian faunas recovered from two distinct geographic regions: the equatorial Atlantic (ODP site 1260) and the North Atlantic (ODP site 1051). A total of 276 species were identified, including 37 new to science. Taking advantage of the cyclostratigraphic framework developed at Site 1260, we refined the global tropical radiolarian biozonation. The absolute ages of 71 radiolarian bioevents were calibrated and, by comparison with the equatorial Pacific record, the synchroneity of primary bioevents was demonstrated. Once the taxonomic and biostratigraphic frameworks were clarified, the main aim of this thesis was to assess the radiolarian biotic sensitivity to climate change. Two categories of metrics were used to achieve this objective. On the one hand, we performed a whole assemblage quantitative analysis at ODP Site 1051. This detailed investigation of the radiolarian fauna did not reveal any prominent turnover during the MECO, but only a slight increase in radiolarian taxic richness due to the poleward migration of several tropical radiolarian species. On the other hand, we applied geometric morphometric approaches to quantify the morphological disparity of radiolarian shell through the MECO interval. This study was focused on a single species (Podocyrtis papalis) from Site 1260, and showed that fluctuations in morphological disparity coincide with the warmest interval of the MECO. This signal is interpreted as an indicator of biological stress induced by the warming event
Lozouet, Pierre. "Le domaine atlantique européen au Cénozoïque moyen : diversité et évolution des gastéropodes." Paris, Muséum national d'histoire naturelle, 1997. http://www.theses.fr/1997MNHN0015.
Vautrin, Quentin. "Dynamique évolutive des faunes de mammifères du Sud-Ouest européen durant les réchauffements climatiques intenses de l’Eocène, entre 56 Ma et 45 Ma : le cas des Lophiodontidae." Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTG057.
The early Eocene is marked by a succession of major global warming events that culminated in a period of climatic optimum (EECO) corresponding to the warmest period of the Cenozoic. Due to their short duration and high intensity, these hyperthermal events are often considered as the best analogues of current global warming, and are correlated with important diversification of mammals in the North American fossil record. In Europe, the early Eocene localities are less well known and it is difficult to trace the impact of these climatic events. Lophiodontidae are a family of perissodactyl mammals found in abundance in European Eocene localities, particularly in southern France, making them a model of choice for studying the impacts of hyperthermal events on the evolutionary history of European mammals. The first part of this work consists of an exhaustive study of the intraspecific variability of this family. More than thirty polymorphic dental characters have been identified, as well as the presence of marked sexual dimorphism. The genus Paralophiodon has been revised in light of this high variability and is considered invalid. In all, several hundred specimens from 22 localities in southern Europe were studied and 2 new species belonging to the genus Eolophiodon have been identified. The revision of the lophiodontids of the Occitanie region, placed in a biostratigraphic framework, allow us to rediscuss of the controversial age of the “grès d’Aigne”, and to propose a late Ypresian-early Lutetian age (MP10b-MP11) for this formation, thus filling the previous known gap in the European fossil record. The study of basal lophiodontids, coupled with the results of a new phylogenetic analysis, places the lophiodontids close to chalicothera within the suborder Ancylopoda, suggesting an Asian origin of the family and an arrival of lophiodontids in southern Europe soon after PETM. The study of unpublished material and phylogenetic analyses constrained by the new biostratigraphic data make it possible to distinguish three major phases in the evolutionary history of lophiodontidae that seem to be correlated with the major climate changes of the Eocene. Basal radiation of lophiodontidae is contemporary to the hyperthermal events of the Ypresian and is marked by the multiplication of small size forms and is restricted to the Mesogean Province. The second radiation of lophiodontidae appears contemporaneous with the EECO and its marked by the appearance of the genus Lophiodon and the replacement of small sub-cursorial forms by more massive taxa with sligthly more molarized premolars. This radiation marks the end of the endemism of lophidontidae that dispersed throughout all Western Europe. Lophiodontidae radiate one last time at Lutetien during the post-EECO cooling, during the "Intra Eocene Mammal Turnover I". This radiation sees the introduction of giant forms (one to two tons), graviportal and with molarized teeth, interpreted as a response to the relative opening of the environment during the post-EECO cooling leading to drastic changes in diets
Maitre-Rigaud, Élodie. "Les chiroptères paléokarstiques d'Europe occidentale, de l'Éocène moyen à l'Oligocène inférieur, d'après les nouveaux matériaux du Quercy (SW France) : systématique, phylogénie, paléobiologie." Lyon 1, 2008. http://www.theses.fr/2008LYO10056.
The material from 90 localities, paleokarstic in most part, has been gathered together in order to study the Western Europe bat evolution and diversity from the middle Eocene (~44 Myr) up to the early late Oligocene (~29 Myr). The morphological and biometrical observations and comparisons of the tooth material allow recognizing 7 families, 10 genera and 52 species. Several taxa of various systematic rank were described as new ones: 1 family, 2 genera, 1 sub-genus and 21 species. Thanks to these first results and the long involved time extent (more than 10 myr), this work suggested some phyletic hypothesis. Among others were discussed the relationships between the new mixopterygid fossil family and the emballonurid and hipposiderid fossil and extant families, and by the way considering their molecular data. The peculiar Necromantis fossil genus being now better documented, its particular inferior molar pattern was exemplified as defining the necromantodont pattern. Even if the Necromantis affinities still remain unclear, the new data allowed to show the previous megadermatid assessment as being irrelevant. Thanks to the available information from the bat material, the relative datation of yet unstudied and undated new localities were proposed from biochronal reference-stages, characterized by some bat species with a given size and morphology. Also, further data were supplied for faunas dated by the numerical ages method. The taxonomic biodiversity of the studied faunas was also evaluated using other fossil material (humerus, wing-shape, tooth wear…) and when possible it was illustrated from the studied material. This approach showed us the constant need to consult the present faunas in order to better understand the fossil ones. So, two quantitative analyses are realized, bringing out informations about the structure of the fauna. First, a Principal Component Analysis of the tooth-shape showed that the premolars (P4/4) and molars Length/width ratio is characteristic for each genus. Second, the comparison of fossil and present bat cenograms suggested that the body weight composition of the community is linked to the nature of the environment in which it evolves. Finally, these analyses allowed us to deduce some bat evolutive modalities either by the variations of weight interval, either by the proportion of the different weight categories. They showed that extinctions preferentially affect morphologically or weightly extreme species. Consequently, this allowed discussing the effect of Stehlin’s faunal “Grande Coupure” event among the Western European bats at the Eocene-Oligocene boundary
Ditbanjong, Pitaksit. "Stratigraphy and tectonics of Cenozoic deposits at the Southwestern border of the Mesohellenic basin, continental Greece." Electronic Thesis or Diss., Lille 1, 2013. http://www.theses.fr/2013LIL10099.
The Mesohellenic Basin is an Oligo-Miocene intermontane basin preserved in Northern continental Greece, at the boundary between the external and internal zones of the Hellenides. This thesis presents a detailed analysis of the deposits outcroping in the southernmost part of the basin, on its western border. Three fault-bounded blocks are presented successively, including facies, stratigraphic and tectonic data. A detailed geological map is provided, featuring lithological formations of chronological significance. The main structure is a faulted monocline dipping toward the basin. Faults are mostly normal faults, although compressional features are observed. Synsedimentary listric faults are recorded in the lower part of the basin fill. The major block-bounding faults were probably lately inverted. The facies indicate mainly submarine gravity flows and associated turbidites. The sediments were supplied first locally (erosion of the mesozoic cover) and then, for most of basin fill, from denudation of the pelagonian basement (internal zones). Paleocurrent directions, related to this main part of the infill, indicate a source to the Northeast, in the Pelagonian zone, similarly to what observed northward in the Meteora area, on the other side of the basin. The stratigraphic succession is marked by facies gaps and erosional unconformities which point to a dominant tectonic control. The micropaleontologic analyses provide an overall Upper Oligocene-Lower Miocene age of the series. This age is younger than that of the early stages of the basin more to the north, but rather contemporaneous with the Meteora conglomerates, the tectonic origin of which was previously demonstrated
Ditbanjong, Pitaksit. "Stratigraphy and tectonics of Cenozoic deposits at the Southwestern border of the Mesohellenic basin, continental Greece." Thesis, Lille 1, 2013. http://www.theses.fr/2013LIL10099/document.
The Mesohellenic Basin is an Oligo-Miocene intermontane basin preserved in Northern continental Greece, at the boundary between the external and internal zones of the Hellenides. This thesis presents a detailed analysis of the deposits outcroping in the southernmost part of the basin, on its western border. Three fault-bounded blocks are presented successively, including facies, stratigraphic and tectonic data. A detailed geological map is provided, featuring lithological formations of chronological significance. The main structure is a faulted monocline dipping toward the basin. Faults are mostly normal faults, although compressional features are observed. Synsedimentary listric faults are recorded in the lower part of the basin fill. The major block-bounding faults were probably lately inverted. The facies indicate mainly submarine gravity flows and associated turbidites. The sediments were supplied first locally (erosion of the mesozoic cover) and then, for most of basin fill, from denudation of the pelagonian basement (internal zones). Paleocurrent directions, related to this main part of the infill, indicate a source to the Northeast, in the Pelagonian zone, similarly to what observed northward in the Meteora area, on the other side of the basin. The stratigraphic succession is marked by facies gaps and erosional unconformities which point to a dominant tectonic control. The micropaleontologic analyses provide an overall Upper Oligocene-Lower Miocene age of the series. This age is younger than that of the early stages of the basin more to the north, but rather contemporaneous with the Meteora conglomerates, the tectonic origin of which was previously demonstrated
Heba, Grigor. "Évolution de la plate-forme carbonatée de Kruja, en Albanie : du crétacé à l'éocène." Thèse, 2008. http://www.archipel.uqam.ca/1683/1/d1748.pdf.