In: Palaeogeography, Palaeoclimatology, Palaeoecology, 2009, vol. 273, no. 3-4, p. 239-248
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In: Marine Geology, 2008, vol. 250, p. 223–233
Significant synchronous shifts in the chemistry, mineralogy, grain sizes and color of the sediments at 6 m below sea floor (mbsf) at ODP Site 1195 on the Marion Plateau (NE Australia) are interpreted to reflect a major regional paleoceanographic change: the initiation of the southern province of the Great Barrier Reef (GBR). The onset of this massive carbonate production centre nearby resulted...
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In: Chemical Geology, 2007, vol. 244, no. 3-4, p. 679-690
An analytical procedure has been developed for the in situ measurement of calcium isotope composition of carbonates with a spatial resolution of 15–20 μm on a Caméca IMS 1270 ion microprobe. By using two Faraday cup detectors, the ⁴⁰Ca and ⁴⁴Ca can be measured simultaneously, improving the internal reproducibility. Instrumental mass fractionation (IMF) of calcium isotopes was...
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In: The Journal of Foraminiferal Research, 2007, vol. 37, no. 3, p. 270-276
We present a recently developed method using a field emission scanning electron microscope (FEG) to view and photograph microfossil specimens that are not coated by conductive material. The FEG microscope provides high electron flux and offers the option to capture images at low beam voltage. Balancing incident energy with absorbed energy from the detector leads to charge-free images of...
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In: Swiss Journal of Geosciences, 2007, vol. 100, no. 2, p. 215-225
Dans l’île de São Nicolau, archipel du Cap Vert, des calcaires néritiques, intercalés dans des basaltes alcalins, ont été attribués au Crétacé supérieur et à l’Eocène. Un tel âge impliquerait une activité volcanique subaérienne ou sousmarine de faible profondeur dans l’archipel du Cap Vert dès le Mésozoïque et documenterait donc une histoire géologique différente des...
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In: The Journal of Foraminiferal Research, 2007, vol. 37, no. 4, p. 309-317
Traditionally, the benthic foraminifera Hyalinea balthica (Schröter) has been considered a species with high intraspecific variability, possibly related to climatic changes, and, therefore, a potential indicator of paleoclimate in the Mediterranean Sea. However, a stable and characteristic morphology very different from the syntype of the species can be observed in specimens from the Sea...
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In: Eclogae Geologicae Helvetiae, 2006, vol. 99, no. 3, p. 295-299
L’espèce de foraminifère Dicarinella imbricata, du Crétacé supérieur de Suisse, a été décrite par L. Mornod en 1949. L’holotype a été figuré seulement par des dessins de l’auteur, et l’holotype n’a jamais été déposé dans le domaine public. Comme l’holotype manquait depuis longtemps, il a été considéré comme perdu et un néotype a été créé. Cependant,...
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In: Geochemistry Geophysics Geosystems, 2007, vol. 8, p. Q01003
In situ measurement of Li isotope ratios in foraminifera has been developed using a Cameca ims 1270 ion microprobe. In situ δ⁷Li analyses have been performed in biogenic calcite of planktonic foraminifera from various locations. Results show that for west Pacific mixed Globigerinoides and Globorotalia (22°S161°E), the isotopic variability between tests and within a...
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In: The Journal of Foraminiferal Research, 2006, vol. 36, no. 4, p. 374-378
The species Globotruncana (Rotalipora) reicheli and Gobotruncana (Rotalipora) montsalvensis, were established in 1949 by Mornod. The two holotypes were figured only by drawings and the specimens were never made publicly available. Since their first description, these two species have acquired great importance as biostratigraphic markers. However, holotypes had been considered as...
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In: Journal of Micropalaeontology, 2004, vol. 23(2), p. 139
Bolboforma is a microfossil of uncertain origin with affinities to protophytic algae. It generally occurs at high latitudes and/or in cool and temperate waters and has a high stratigraphic potential especially for the Miocene. Calcareous cysts of dinoflagellates represent the ‘benthic cyst stage’ of unicellular organisms belonging to the marine phytoplankton.The occurrence of...
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