134 research outputs found
Die Gotthardstrasse von Luzern bis Lugano / Pont Tremola : Route du St. Gotthard : S. 1
No full textJ. Suter, ad. nat. del. et sculp.Als Illustration auch erschienen in: Fünfzehn Ansichten der neuen St. Gotthards-Strasse vom St. Gotthard-Hospiz bis Lugano / nach der Natur gezeichnet und geätzt von Joseph Meinrad Kälin, Jakob Suter; nebst einer Beschreibung von Herrn Karl Franz Lusser. - Zürich : bey Heinrich Füssli, 1833, zwischen S. 48 und 49Aufgeführt im Verlagsverzeichnis, datiert um 1837: Ansichten der Schweiz nach Originalzeichnungen von Meyer, Korrodi, Suter u.A., in Aquatinta geätzt von Falkeisen, Martens und Suter, herausgegeben von Heinrich Füssli & Comp. in ZürichAus der Sammlung Johann Müller-Wegmann; Depositum der SAC Sektion Uto in der Zentralbibliothek des SA
Die Gotthardstrasse von Luzern bis Lugano / Route de Val Tremola vers Airolo, Stalvedro, Piotta & Ambri : Route du St. Gotthard
No full textM. Kälin, ad. nat. del. et sculp.Als Illustration auch erschienen in: Fünfzehn Ansichten der neuen St. Gotthards-Strasse vom St. Gotthard-Hospiz bis Lugano / nach der Natur gezeichnet und geätzt von Joseph Meinrad Kälin, Jakob Suter; nebst einer Beschreibung von Herrn Karl Franz Lusser. - Zürich : bey Heinrich Füssli, 1833, zwischen S. 40 und 41Aufgeführt im Verlagsverzeichnis, datiert um 1837: Ansichten der Schweiz nach Originalzeichnungen von Meyer, Korrodi, Suter u.A., in Aquatinta geätzt von Falkeisen, Martens und Suter, herausgegeben von Heinrich Füssli & Comp. in ZürichAus der Sammlung Johann Müller-Wegmann; Depositum der SAC Sektion Uto in der Zentralbibliothek des SA
Calcareous nannofossils biostratigraphy (Upper Bajocian – Lower Bathonian) of the Ravin du Bès section (Bas Auran, Subalpine Basin, SE France), evolutionary trends of Watznaueria barnesiae and new enigmatic morphotypes of genus Rucinolithus
No full textA biostratigraphic and evolutionary study based of calcareous nannofossils was performed on the Ravin du Bès section (Bas Auran area, SE France), proposed as formal candidate of Global Boundary Stratotype Section and Point (GSSP) for the base of the Bathonian stage (Fernàndez-Lòpez et al., 2007). Semiquantitative estimates of total nannofloral abundance and single species abundance were carried out. The following biohorizonts were identified and calibrated to ammonite biostratigraphy: the first occurrence (FO) of Watznaueria aff. W. barnesiae, the FO of Pseudoconus enigma; the FO of Rucinolithus sp.; the last occurrence (LO) of Hexalithus magharensis; the FO of Stephanolithus speciosum octum and the FO of Watznaueria barnesiae. These results, consistent with biostratigraphic scheme previously proposed (Erba 1988, 1990; de Kaenel & Bergen 1993; de Kaenel et al. 1996; Bown & Cooper 1998; Mattioli & Erba 1999) confirm that the calcareous nannofossils are good biostratigraphic markers for the Bajocian/Bathonian boundary interval. Moreover, the finding of P. enigma within of the Sub-Mediterranean province allows a direct calibration between Tethyan and Boreal nannofossil events and biozones.
This study showed an evolutionary trend from Watznaueria communis to Watznaueria barnesiae that seems to support the theory of punctuated equilibria rather than a phyletic gradualism.
We also documented the occurrence of new morphotypes of uncertain polycycloliths. These enigmatic nannoliths are very similar to specimens of the Cretaceous taxon R. terebrodentarius, whose peculiar structure poses doubts on its origin. In fact, as previously speculated (Tremola & Erba 2002; Erba 2004), R. terebrodentarius nannoliths might be CaCO3 precipitates or biocalcification by bacteria under peculiar oceanographic conditions rather than products of coccolithophorid algae.
REFERENCES
Bown, P.R., Cooper, M.K.E, 1998. Jurassic. In: Bown, P.R. (EDS.), Calcareous Nannofossil Biostratigraphy. British Micropaleont. Soc. Publ. Series. Kluwer Academic Publishers, London: 34-85.
De Kaenel, E., Bergen, J.A., 1993. New early and Middle Jurassic coccolith taxa and biostratigraphy from the eastern proto-Atlantic (Morocco, Purtugal and DSDP Site 547B). Eclogae Geol. Helv., 86: 861-907.
De Kaenel, E., Bergen, J.A., von Salis Perch Nielsen, K., 1996. Jurassic calcareous nannofossils biostratigraphy of western Europe. Compilation of recent studies and calibration of bioevents. Bull. Soc. Geol. Fr., 167: 15-28.
Erba, E., 1988. Calcareous nannofossils from the Bas Auran section. In: M., Innocenti, C., Mangold, G., Pavia and H. Torrens, A proposal for the formal ratification of the basal boundary stratotype of the Bathonian stage based on a Bas Auran section (S.E. France). 2nd International Symposium on Jurassic Stratigraphy, 333-346.
Erba, E., 1990. Calcareous nannofossil biostratigraphy of some Bajocian sections from Digne area (SE france). Mem. Descr. Carta geol. Ital.,40: 237-356.
Erba, E. 2004. Calcareous nannofossils and Mesozoic Oceanic Anoxic Events. Marine Micropaleont. 52, 85-106.
Fernando-Lòpez, S.R., Pavia, G., Erba, E., Guiomar, M., Henriques, M.H., Lanza, R., Mangold, Morton, N., C., Olivero, D., Tiraboschi, D., 2007. Formal proposal for the Global Boundary Stratotype Section and Point (GSSP) of the Bathonian Stage, at the base of the Zigzag Zone in the Ravin du Bès Section (Bas-Auran, Sudalpine Basin, SE France). International Subcommission of Jurassic Stratigraphy. Bathonian Working Group Ballot: 1-43.
Mattioli, E., Erba, E., 1999. Synthesis of calcareous nannofossil events in Tethyan Lower and Middle Jurassic successions. Riv. Ital. Paleontol. Stratigr., 105: 373- 376.
Tremolada, F., Erba, E., 2002. Morphometric analyses of Aptian Assipetra infracretacea and Rucinolithus terebrodentarius nannoliths: Implications for taxonomy, biostratigraphy and paleoceanography. Marine Micropaleont., 44: 77-92
The status of Virgo
No full textAfter almost 4 years of commissioning Virgo has started its first long science run. The recent commissioning and data analysis activities are summarized here
Methods of gravitational wave detection in the VIRGO Interferometer
No full text"The Multicoloured Landscape of Compact Objects and their explosive origin
The status of Virgo
No full textAfter almost 4 years of commissioning Virgo has started its first long science run. The recent commissioning and data analysis activities are summarized here
Virgo Data Analysis for C6 and C7 engineering runs
No full textThe interferometric gravitational wave detector Virgo its completing the commissioning
phase, and it is close to commencing with scientific data taking. In 2005, before a temporary
shutdown of the interferometer, two commissioning runs were performed: the C6
run from July 29th to August 12th, and the C7 run from September 14th to 19th. The
sensitivity of the detector during these commissioning runs was not yet at an interesting
level for scientific observations. However, the bandwidth and stability of the detector is
already sufficient to perform important studies in preparation for the acquisition and
analysis of astrophysically important data. The data have therefore been analyzed by
the Virgo physics groups, with the goal of testing the analysis pipelines and developing
veto strategies. The results also allowed a better understanding of the noise sources, thus
providing useful feedback to the commissioning team
First Coincidence Search among Periodic Gravitational Wave Source Candidates Using Virgo Data
No full textThis paper describes the ongoing work we are doing on the blind search for continuous gravitational waves emitted by isolated asymmetric rotating neutron stars in the data of the interferometric detector Virgo. An optimal blind search for continuous sources cannot be done with the presently available computing power. We have developed a hierarchical procedure which strongly cut the computational needs, with respect to the optimal analysis, at the cost of a small reduction in sensitivity.1 We have used the data of the two commissioning runs C6 and C7 to build two periodic source candidate data bases. Each candidate is defined by the physical parameters of the source, namely frequency, sky position and value of the spin-down first order parameter. We have performed an all sky analysis, covering the frequency band 50 - 1050 Hz and spin-down in 0 - 1.52 · 10-4 Hz/day. We have done a preliminary search for coincidences between the physical parameters of the two candidate sets. We present the full procedure and the results
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