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Article Reference Unraveling the PETM in shallow marine Tethyan environments: the Tunisian stratigraphic record.
Despite the increasing understanding of the Paleocene-Eocene thermal maximum (PETM) in open marine environments, shallow marine settings remain relatively unexplored. We investigated an upper Paleocene to lower Eocene shallow-water sequence near Kalaat Senan in Tunisia (Sidi Nasseur and Wadi Mezaz sections)in order to generate a stratigraphic framework of the PETM in shallow marine fine-grained siliciclastic setting on the Southern Tethys. These sections expose the top part of the El Haria Formation (Fm.), the Chouabine Fm. and the lower part of the limestone bearing El Garia Fm., covering the upper Paleocene - lower Eocene (NP9a to NP11). The PETM interval is situated near the top of the El Haria Fm. and the regional stratigraphy is compared to the well-known Egyptian setting. The isotope record of total organic carbon (δ13Corg)reveals the characteristic negative carbon isotope excursion(CIE), comparable to the δ13Corg record of the Global Boundary Stratotype Section and Point of the Eocene at Dababiya (Egypt). Although the Tunesian PETM interval is quite expanded, no anomalous beds are observed and only the "CIE" core is partly represented as the top part of the PETM is truncated. In addition to a well-expressed CIE, the position of the Paleocene-Eocene boundary is supported by the appearance of nannoplankton (Discoaster araneus)and foraminiferal (e.g. Acarinina multicamerata)marker taxa. Furthermore, ostracode and benthic foraminiferal turnovers coincide with the onset of the PETM and are characterized by the disappearance of many common Paleocene taxa (e.g. Frondicularia aff. phosphatica) in this area. The lowest occurrences of Alocopocythere attitogonensis and Buntonia ? tunisiensis (ostracodes), Reophax sp. 1 (benthic foraminifera) and Fasciculithus tonii (calcareous nannplankton) may be applicable for regional correlation. These results indicate that characteristic PETM taxa evolved and/or dispersed immediately after the main δ13Corg shift.
Located in Library / RBINS Staff Publications
Article Reference Unravelling geographical and geological sources of geological raw materials used as ornamental stones, millstones and whetstones from the Roman period in Belgium: a mutual favourable cross-border collaboration between geologists and archaeologists.
Located in Library / RBINS Staff Publications
Article Reference Unravelling the eco-evolutionary dynamics of two non-marine ostracod species in response to urbanization
Located in Library / RBINS Staff Publications
Article Reference Unravelling the evolution of Africa’s drainage basins through a widespread freshwater fish, the African sharptooth catfish Clarias gariepinus
Located in Library / RBINS Staff Publications 2020
Article Reference Unravelling the processes controlling apatite formation in the Phalaborwa Complex (South Africa) based on combined cathodoluminescence, LA-ICPMS and in-situ O and Sr isotope analyses.
Located in Library / RBINS Staff Publications 2020
Article Reference Untangling a mess of worms: Species delimitations reveal morphological crypsis and variability in Southeast Asian semi-aquatic earthworms (Almidae, Glyphidrilus)
Located in Library / RBINS Staff Publications 2019
Article Reference Untangling the waterfall damsels: a review of the Mesoamerican genus Paraphlebia Selys in Hagen, 1861 (Odonata: Thaumatoneuridae) with descriptions of 11 new species.
A review of the Mesoamerican genus Paraphlebia Selys in Hagen, 1861 is presented, including diagnoses, illustrations of diagnostic characters, and distribution maps for all species. A key to the known males and females is provided. Eleven new species are described: P. akan Ortega-Salas & González-Soriano. sp. nov., P. chaak Ortega-Salas & González-Soriano sp. nov., P. chiarae Ortega-Salas sp. nov., P. esperanza Ortega-Salas & González-Soriano sp. nov., P. flinti Ortega-Salas & González-Soriano sp. nov., P. hunnal Ortega-Salas & González-Soriano sp. nov., P. itzamna Ortega-Salas, Jocque & González-Soriano sp. nov., P. ixchel Ortega-Salas & González-Soriano sp. nov., P. kauil Ortega-Salas & González-Soriano sp. nov., P. kinich Ortega-Salas & González-Soriano sp. nov., and P. kukulkan Jocque & Ortega-Salas sp. nov.
Located in Library / RBINS Staff Publications 2022
Article Reference Unusual geologic evidence for coeval seismic shaking and tsunamis reinforces variability in earthquake size and recurrence in the area of the giant 1960 Chile earthquake.
Located in Library / RBINS Staff Publications 2017
Article Reference Unusual pectoral apparatus in a predatory dinosaur resolves avian wishbone homology
Located in Library / RBINS Staff Publications 2021
Article Reference Unveiling hidden species diversity within Southern Ocean Iphimediidae (Crustacea, Amphipoda) through DNA and 3D-geometric morphometrics, with the description of 10 new species
The Antarctic shelf benthos is threatened by climate-related environmental changes and anthropogenic stressors. A baseline knowledge of biodiversity and species distribution ranges is essential for effective monitoring and conservation. Here, we integrate DNA-based species delimitation methods with morphological analyses to explore species diversity within Antarctic Iphimediidae. Our results reveal that ten nominal species are complexes of multiple species, most of which can be distinguished by small but consistent morphological differences. We formally describe ten of these new species: Stegopanoploea brevidentata sp. nov., Maxilliphimedia acutilobata sp. nov., Maxilliphimedia oliveri sp. nov., Echiniphimedia spinosior sp. nov., Echiniphimedia maxima sp. nov., Iphimediella longidentata sp. nov., Iphimediella brachyodonta sp. nov., Iphimediella longilobata sp. nov., Labriphimedia adeliae sp. nov., and Labriphimedia anneninae sp. nov. Most previously recorded circum-Antarctic iphimediid species are found to consist of regionally distributed species. Furthermore, we apply 3D-geometric morphometrics on the Gnathiphimedia sexdentata complex to investigate whether ‘cryptic’ species can be differentiated by variation in continuous morphological traits. This method provides additional diagnostic characters for the morphological identification of two G. sexdentata clades. This integrative taxonomy study increases the number of nominal Antarctic iphimediid species from 39 to 49, with 14 additional putative species requiring further study for formal description.
Located in Library / RBINS Staff Publications 2025