1,721,020 research outputs found
Bivalvi ed ecobiostratigrafia nel Pliocene Mediterraneo
No full textFirst International Workshop on the Pliocene, Estepona (13-15 settembre), Abstract book
The Monte Falcone-Rio Riorzo composit section: biostratigraphic and ecobiostratigraphic remarks.
No full textThe ecobiostratigraphic study of the historical Piacenzian stratotype and in particular of the Monte Falcone - Rio Riorzo section supports a three-fold subdivision of the Pliocene, consistent with the introduction of a new stage representing the Upper Pliocene. The base of this new stage, the Gelasian, which was ratified by IUGS in 1996, just predates the onset of significant northern hemisphere glaciation (in the sense of Shackleton et al., 1984). In the M. Falcone-R. Riorzo section two of the more significant changes in the taxonomic diversity of the Mediterranean molluscan fauna are recorded. The older change, characterized by the sharp disappearance of tropical taxa, is well calibrated within the magneto-biostratigraphic framework of the Mediterranean Pliocene and appears just to post-date the very base of the Gelasian. The paleoecological analyses of the succession testify that this change is not due to edaphic factors but to paleoclimatic changes. In conclusion the Monte Falcone - Rio Riorzo section appears to represent an useful ecobiostratigraphic model for the evolution of the shallow water environments of the Mediterranean late Pliocene
Deep Sea Faunas in the Middle Pliocene of Northern Italy: The Korobkovia oblonga – Jupiteria concava Paleocommunity
No full textThe Messinian marine molluscs record and the dawn of the easternAtlantic biogeography
No full textThe biological impact of the Messinian Salinity Crisis (MSC) and its bearing on the Pliocene Mediterranean marine molluscan fauna has been analyzed on the basis of the biogeographic and stratigraphic distribution of the taxa of 16 early Messinian outcrops. The extinction of the last paleoendemic Proto-Mediterranean taxa is historically significant but it appears numerically less important than the extinction of the Tortonian and Messinian neoendemic taxa. The available data suggest that the MSC caused a regional mass disappearance but only a limited number of extinctions. It is also emphasized that the Late Pliocene (Monegatti et al., 2002) extinctions were far heavier than those caused by the MSC. We suggest that the greatest Messinian extinctions were triggered, during the salinity crisis, in the Atlantic “sanctuary” by the Messinian glacial events TG22, TG20, TG14 and TG12, of Shackleton et al. (1994), dated between 5.79 and 5.55 Ma by Krijgsman et al. (2004). A comparison between the Mediterranean Messinian and the Redonian molluscan fauna was also carried out. Finally, the possible latitudinal stability of the climatic thresholds, despite the shifting of the climatic zones throughout the Neogene along the European coast, is pointed out
The Plio - Pleistocene Boundary Controversy. Status in 1979 at the light of International Stratigraphic Guide.
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
One day trip in the outcrops of Castell’Arquato Plio-Pleistocene Basin: from the Badland of Monte Giogo to the Stirone River
No full textInternational conference Paleobiogeography & Paleoecology 2001, Giuda all’escursion
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