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Article Reference Latest Danian carbon isotope anomaly and associated environmental change in the southern Tethys (Nile Basin, Egypt).
Located in Library / RBINS Staff Publications
Article Reference Early Paleogene δ 13C and δ 18O records based on marine ostracodes: implications for the Upper Danian succession at Sidi Naseur (Tunisia) and their application value in paleoceanography
Located in Library / RBINS Staff Publications
Article Reference Reconstruction of a latest Paleocene shallow-marine eutrophic paleoenvironment at Sidi Nasseur (Central Tunisia) based on foraminifera, ostracoda, calcareous nannofossils and stable isotopes (δ13 C, δ18 O).
Located in Library / RBINS Staff Publications
Article Reference The Aktulagay section, west Kazakhstan: a key site for northern mid-latitude Early Eocene stratigraphy.
A section at Aktulagay (west Kazakhstan), in the Peri-Tethys realm, exposes mid-neritic to upper bathyal Ypresian marls, clays and silts. These range from Zone NP10 to early Zone NP14, with abundant and diverse microfossil assemblages. Multidisciplinary analysis has identified dinoflagellate cyst, calcareous nannofossil, planktonic and benthic foraminiferid and pteropod zones and events. Calibration of a key interval in the evolution of the shark Otodus has been possible for the first time. Episodic low-oxygen facies, including sapropelic clays widely distributed in Peri-Tethys, are represented here and can be placed within a detailed biostratigraphic framework. The current lithostratigraphic terminology is modified, with the introduction of the Aktulagay Formation. Paleoenvironmental aspects are discussed; five depositional sequences are tentatively identified. This section can be correlated in detail with the succession in the North Sea Basin, with implications for paleogeographic reconstructions. High-resolution biostratigraphic calibration between disparate fossil groups makes this a key reference section for northern mid-latitude Ypresian biostratigraphy.
Located in Library / RBINS Staff Publications
Article Reference New amphisbaenian lizards from the Early Paleogene of Europe and their implications for the early evolution of modern amphisbaenians
Three new amphisbaenian lizard taxa are described from the Early Paleogene of Western Europe. Two new basal forms, Polyodontobaena belgica gen. et sp. nov. from the Early Paleocene of Hainin (Belgium) and Camptognathosaurus parisiensis gen. et sp. nov. from the Late Paleocene of Rivecourt-Patit Pâtis and Cernay-lès-Reims (France), are characterised by a dentary lacking a strong angle at the symphysis and bearing 10 to 12 massively built and conical teeth. These two taxa form the new family Polyodontobaenidae. A third new amphisbaenian, Blanosaurus primeocaenus gen. et sp. nov., is also described from the Early Eocene of Dormaal (Belgium), Condé-en-Brie and Prémontré (France) and represents the oldest modern amphisbaenian lizard of Europe, tentatively assigned to Blanidae. It is characterised by a reduction of tooth number and by the presence of a strong angle at the symphysis. Palaeobiogeographic considerations suggest a first hypothesis that the Eocene forms would have evolved from the Paleocene species.The second hypothesis would be that as for the lizard Scincoideus haininensis, primitive amphisbaenians were present in Europe from the Paleocene,whereasbeginning in the Early Eocene only modern forms with typical reduced dentition (fewer than 10 teeth) are present. The origin of these modern forms is very likely related with the dispersal of the first modern mammals.
Located in Library / RBINS Staff Publications
Article Reference Eocene stratigraphy of the Wadi Al-Hitan World Heritage Site and Adjacent areas.
Located in Library / RBINS Staff Publications
Article Reference Ypresian - Current status of chronostratigraphic units named from Belgium and adjacent areas
Located in Library / RBINS Staff Publications
Article Reference Eocene stratigraphy of the Wadi Al-Hitan World Heritage Site and Adjacent areas
Located in Library / RBINS Staff Publications
Article Reference Rates of apical septal extension of Desmophyllum dianthus: effect of association with endolithic algae
It has been hypothesized that endolithic algae inside the skeleton of cold-water corals may have a mutualistic relationship with the coral host positively affecting coral calcification. This study investigated the effect of endolithic algae on apical septal extion of the cold-water coral Desmophyllum dianthus at Fjord Comau, southern Chile (42.41° to 42.15° S, 72.5° W). The fluorescent staining agent calcein was used to document the linear apical extension of septae for a period of one and a half years between 2006 and 2007. The results showed a severe reduction of extension rates associated with the presence of endolithic algae. Infested individuals grew about half as fast as non-infested polyps with a median value of 1.18 μm day-1 compared to 2.76 μm day-1. Contrary to the initial hypothesis, these results point towards a parasitic relationship between D. dianthus and its endolithic algae potentially impairing coral fitness. However, further data on physiological parameters and other aspects of the calcification process is necessary to confirm these findings.
Located in Library / RBINS Staff Publications
Article Reference Multi-scale Mineralogical Characterization of the Mediterranean Hypercalcified Sponge Petrobiona massiliana (Porifera, Calcarea, Calcaronea)
The massive basal skeleton of a few remnant living hypercalcified sponges rediscovered since the 1960s are valuable representatives of ancient calcium carbonate biomineralization mechanisms in basal Metazoa. A multi-scale mineralogical characterization of the easily accessible Mediterranean living hypercalcified sponge belonging to Calcarea, Petrobiona massiliana (Vacelet and Lévi, 1958), was conducted. Oriented observations in light and electron microscopy of mature and growing areas of the Mg-calcite basal skeleton were combined in order to describe all structural levels from the submicronic to the macroscopic scale. The smallest units produced are ca. 50–100 nm grains that are in a mushy amorphous state before their crystallization. Selected area electron diffraction (SAED) further demonstrated that submicronic grains are assembled into crystallographically coherent clusters or fibers, the latter are even laterally associated into single-crystal bundles. A model of crystallization propagation through amorphous submicronic granular units is proposed to explain the formation of coherent micron-scale structural units. Finally, XRD and EELS analyses highlighted, respectively, inter-individual variation of skeletal Mg contents and heterogeneous spatial distribution of Ca ions in skeletal fibers. All mineralogical features presented here cannot be explained by classical inorganic crystallization principles in super-saturated solutions, but rather underlined a highly biologically regulated formation of the basal skeleton. This study extending recent observations on corals, mollusk and echinoderms confirms that occurrence of submicronic granular units and a possible transient amorphous precursor phase in calcium carbonate skeletons is a common biomineralization strategy already selected by basal metazoans.
Located in Library / RBINS Staff Publications