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Université de Fribourg

Neritic isotope and sedimentary records of the Eocene–Oligocene greenhouse–icehouse transition: The Calcare di Nago Formation (northern Italy) in a global context

Jaramillo-Vogel, David ; Strasser, André ; Frijia, Gianluca ; Spezzaferri, Silvia

In: Palaeogeography, Palaeoclimatology, Palaeoecology, 2012, p. -

From the Middle Eocene to Early Oligocene, the Earth experienced the most significant climatic cooling of the Cenozoic era. The Eocene–Oligocene transition (EOT) represents the culmination of this climatic cooling, leading to the onset of the Antarctic glaciation and, consequently, to the beginning of the present-day icehouse world. Whereas the response of deep-sea systems to this climate...

Université de Fribourg

The FOBIMO (FOraminiferal BIo-MOnitoring) initiative—Towards a standardised protocol for soft-bottom benthic foraminiferal monitoring studies

Schönfeld, Joachim ; Alve, Elisabeth ; Geslin, Emmanuelle ; Jorissen, Frans ; Korsun, Sergei ; Spezzaferri, Silvia

In: Marine Micropaleontology, 2012, vol. 94-95, p. 1-13

The European Community Marine Strategy Framework Directive (MSFD) was established to provide guidelines for monitoring the quality of marine ecosystems. Monitoring the status of marine environments is traditionally based on macrofauna surveys, for which standardised methods have been established. Benthic foraminifera are also good indicators of environmental status because of their fast turnover...

Université de Fribourg

Reworked microfossils as a paleogeographic tool

Pirkenseer, Claudius ; Spezzaferri, Silvia ; Berger, Jean-Pierre

In: Geology, 2011, vol. 39, no. 9, p. 843-846

The abundant occurrence of reworked microfossils within the paleogeographically restricted Upper Rhine Graben of central Europe represents a unique opportunity to investigate their inherent information, allowing new insights into the paleogeographic framework and past sedimentary pathways. In the late Rupelian and early Chattian a transgression-regression cycle linked to the global Ru2–Ru3...

Université de Fribourg

Faunal evidence of a holocene pluvial phase in southern Arabia with remarks on the morphological variability of Helenina anderseni

Gennari, Giordana ; Rosenberg, Thomas ; Spezzaferri, Silvia ; Berger, Jean-Pierre ; Fleitmann, Dominik ; Preusser, Frank ; Al-Shanti, Mahmoud ; Matter, Albert

In: The Journal of Foraminiferal Research, 2011, vol. 41, no. 3, p. 248-259

Although foraminifera have been found living in inland saline lakes isolated from the sea, this phenomenon has rarely been recognized in the fossil record. This study documents the occurrence of benthic foraminifera in Holocene lake sediments located nearly 500 km inland from the Red Sea, in the Al-Mundafan region of southern Saudi Arabia. The lake formed during a regional pluvial period,...

Université de Fribourg

Growth and demise of cold-water coral ecosystems on mud volcanoes in the West Alboran Sea: the messages from the planktonic and benthic foraminifera

Margreth, S. ; Rüggeberg, A. ; Comas, M.C. ; Pinheiro, L.M. ; Spezzaferri, Silvia

In: Marine Geology, 2011, vol. 282, no. 1-2, p. 26-39

The Dhaka and Maya mud volcanoes (MVs), located in the Mud Diapir Province in the Western Alboran Basin along the Moroccan Coasts, were cored during the TTR-17, Leg 1 cruise. Cores were taken on the top of the volcanoes at a water depth of 370 m on the Dhaka MV (core TTR17-MS411G) and at 410 m water depth on the Maya MV (core TTR17-MS419G), respectively. On both mud volcanoes the extruded mud...

Université de Fribourg

Carbonate mounds in shallow and deep time

Henriet, Jean-Pierre ; Spezzaferri, Silvia ; Samankassou, Elias ; Foubert, Anneleen ; Van Rooij, David ; Rüggeberg, Andres

In: Marine Geology, 2011, vol. 282, no. 1-2, p. 1-4

Special Issue on COld-water CArbonate Reservoir systems in Deep Environments - COCARDEOver a decade of research on recent cold-water coral mounds in various oceans has set the stage for comparative studies between recent and ancient carbonate mound systems, with the aim to unravel generic processes and reveal the “red thread” in a fundamental strategy of Life building Geology — a...

Université de Fribourg

Taxonomic revision and new species/subspecies of Middle-Late Miocene (Bessarabian) miliolids of the Family Hauerinidae Schwager from Georgia — Eastern Paratethys

Maisuradze, Lamara ; Koiava, Kakhaber ; Spezzaferri, Silvia

In: Geologica Carpathica, 2009, vol. 60, no. 5, p. 419-430

Three new miliolid taxa from Bessarabian sediments from Georgia (Eastern Paratethys) are described following the classification of Łuczkowska (1972), which has never been used before by ex-Soviet micropaleontologists. They are: Varidentella luczkowskae; Varidentella reussi (Bogdanowicz) subsp. costulata; and Affinetrina voloshinovae (Bogdanowicz) subsp. eldarica. This classification takes into...

Université de Fribourg

Late Eocene impact-induced climate and hydrological changes: Evidence from the Massignano global stratotype section and point (central Italy)

Coccioni, Rodolfo ; Frontalini, Fabrizio ; Spezzaferri, Silvia

In: Geological Society of America Special Paper, 2009, vol. 452, p. 97–118

The Eocene-Oligocene transition marks the passage from “greenhouse” conditions to an “icehouse state” with progressive global cooling starting in the early middle Eocene. The late Eocene is also characterized by a high concentration of extraterrestrial impacts, the effects of which, on living organisms and climatic changes, are still not understood. We carried out a high-resolution...