1,721,007 research outputs found
Conodont evolution trend around Norian-Rhaetian boundary in the Lagonegro succession, southern Apennines, Italy
No full textLa serie triassica del Monte Cetona (Toscana meridionale) e suo confronto con quella di La Spezia.
No full textThe Upper Triassic biostratigraphy of Mt. Volturino (Lagonegro Basin, Southern Apennines, Italy)
No full textNew data on bio- and lithofacies variations around the Triassic/Jurassic boundary in the Porto Venere sections (La Spezia, Italy).
No full textThe Upper Triassic integrate biostratigraphy of Mt. Volturino (Lagonegro basin, Southern Apennines, Italy)
No full text
Alghe verdi dasicladali del Triassico medio di Tempa di Rocca Rossa, Moliterno (Italia meridionale, Basilicata): studio preliminare).
No full textMiliolechina stellata, n.gen., n.sp., et Hirsutospirella pilosa, n. gen., n. sp. (foraminifères), dans le Trias superieur (Norien) a facies recifal des Dinarides.
No full textGandinella falsofriedli (Salj, Borza et samuel, 1983)(foraminifère, Trias Supérieur), étude de l'espèce sur la base du matérial-type du Domuz Dag (Taurus Lycien, Turquie).
No full textNew biostratigraphical constraints for the Norian/Rhaetian boundary: data from Lagonegro Basin, Southern Apennines, Italy
Full text linkFour stratigraphic sections belonging to Lagonegro succession (Southern Apennines) at Mt S. Enoc, Pignola-Abriola, Sasso di Castalda and Mt Volturino have been studied in detail under to provide a new micro-palaeontological data set based on conodonts and radiolarians for the characterization of the Norian⁄Rhaetian interval. The studied sec- tions represent the different settings of the Lagonegro Basin (from proximal to distal facies) and permit a detailed, integrated, biostratigraphy of the Calcari con Selce (cherty limestones) and Scisti Silicei formations (bedded cherts with radiolarians) to be drawn up. The upper portion of the Calcari con Selce Formation, exhibits intermediate charac- teristics between the Calcari con Selce and Scisti Silicei Formation, in particular the pro- gressive decrease in carbonate content against an increase in shales and cherts. Within the four sections studied, the Norian ⁄ Rhaetian interval has been documented both with conodonts and radiolarians. Because of the continuity and the absence of condensed facies, it has been possible to recognize the morphocline between species Misikella hern- steini and Misikella posthernsteini, here represented by all the transitional forms charac- terized by common features between the two species, gathered in three evolutionary steps. Moreover, the morphocline between M. hernsteini and M. posthernsteini has been involved in the definition of the Norian ⁄ Rhaetian Boundary, recognizing thus the FAD of M. posthernsteini, one of the possible biomarkers proposed for the boundary. The rich, well-preserved, radiolarian associations of Pignola-Abriola, Sasso di Castalda and Mt Volturino permit the correlation of Tethyan and American conodont successions, high- lighting the importance of the mostly coincident occurrences of M. posthernsteini and Epigondolella mosheri morphotype A, which correspond to the base of Proparvicingula moniliformis A. Z. and the disappearance of bivalve Monotis. These coincident bioevents are used here to define the base of the Rhaetian stage
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