1,721,110 research outputs found
Preface
No full text[From Preface to Özcan et. al. (2022), Atlas of the Tethyan orthophragmines] (...) The Atlas is the compendium of an enormous work by E. Özcan and his co-workers. It manages to present a difficult subject in a way that even a non-specialist can understand the basics of species or subspecies identification, whereas a specialist will be able to admire the fine nuances in novel systematic details, interpretations, and data. The Atlas provides succinct and precise diagnoses of all the species, and all subspecies are biometrically characterized. For the first time, high-quality photographs illustrate a large number of
taxa belonging to five genera of Neo-Tethyan orthophragmines, with precise and standardized enlargement scales,
both in equatorial and axial sections. This will be an invaluable step forward for any rock thin section analysis in which
the identification of orthophragmines in axial or oblique sections has been generally difficult or neglected or has led to spurious results. The quality of the illustrated material is excellent, based on a large number of painstakingly sectioned specimens and unpublished material. (...
Paleobiogeography of Paleogene larger Foraminifera from the Mediterranean Tethys to the western Pacific using Parsimony Analysis: a preliminary attempt.
No full textLarger Foraminifera are a diverse and much investigated group, with a wide stratigraphic and paleobiogeographic distribution. The present work focuses on the Paleogene larger Foraminifera from the Mediterranean Neotethys and adjacent basins the Middle East, the eastern margin of Africa, SE Asia and the western Pacific domain. Aim of the present study is to discover whether using the existing larger foraminiferal evidence it is possible to discover historical patterns of relationships of the biota from the sample areas. Data matrices of taxonomic units and sample areas were compiled for five time intervals: Thanetian, Ilerdian, Middle Eocene, Priabonian and Rupelian. Among the various methods currently employed in paleobiogeography, Parsimony Analysis of Endemism was chosen because it allows to infer in cladistically unresolved groups the closeness of the biota of each sample area in respect to others. The method produces cladograms of sample areas which can he interpreted in terms of relative recency of biotic contact. However; a major constraint using this method is that taxa unique to a single sample area are uninformative. The integration of the available evidence on paleogeography, paleoclimatology and paleoecology suggests possible hypotheses to explain the obtained cladograms different diversities and taxonomical composition of the larger foraminiferal assemblages, although sampling and taxonomy may introduce paleontological artifacts. The preliminary data base of 335 operative taxonomic units may be expanded and represents a flexible tool for further studies
Commissione giudicatrice per l'assegnazione del "Premio della Società Geologica Italiana" per l'anno 2004
No full textBiostratigrafia dei macroforaminiferi del Paleogene della Maiella nel quadro delle piattaforme periadriatiche
No full textThe choice of larger Foraminifera as key-group for the biostratigraphy of the Paleogene of central Italy reflects a number of reasons. Among these are their abundance in shallow-water deposits and slope-proximal basin resediments, their relatively narrow paleoecological distributions, their short biostratigraphical ranges and their high interbasinal correlation value, at least for the Mediterranean segment of the Paleogene (Neo-)Tethys. The biostatigraphic framework proposed herein, which may be further refined, relies mainly on studies in progress on the faunal assemblages of the Maiella carbonate platform. Additional evidence comes from the Gargano promontory, the Tremiti Islands and the Latium-Abruzzi segment of the central Apennines. With exception of the latter, all these areas belong to the so-called "African Promontory" or "Adria microplate", which played an important role in the geodynamic evolution of the central Mediterranean. Among the main aims of the present contribution is the attempt to develop a regional biozonation based on multiple lineages and on different taxonomic groups, in order to minimize the bias arising from both reworking and ecological factors and to provide a practical means for age dating in the field and in thin sections. Additional, independent control and evidence is provided by calcareous planktic and smaller benthic Foraminifera and algae. Finally, paleoecological distributions of Paleogene larger Foraminifera represent an excellent instrument for interpreting the platform-basin transitional environment
Adelosina d'Orbigny, 1826 (Foraminifera: Miliolacea), a possible index of eutrophy. In: Cherchi A. (Ed.), Autecology.
No full textThe definition and history of the genus Adelosina d'Orbigny, 1826 (Foraminifera: Miliolacea), comprising about sixty nominal fossil and extant species, are briefly reviewed. Adelosina is assigned to the Cribrolinoididae Haynes, 1981 (nom. transl.). An outline is given on its distribution and ecology, focusing on examples from the Indopacific and Mediterranean domains. The consistent link between high nutrient levels and the presence of Adelosina and its allies suggests their potential significance in paleoecological studies and in coastal pollution monitoring
Commissione giudicatrice per l'assegnazione del "Premio della Società Geologica Italiana" per l'anno 2009
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