1,721,037 research outputs found
Calcareous nanofossil biostratigraphy of Paleocene to Middle Eocene successions (Tertiary Flysch Auctt.) of the Northern Appennines
No full textAn accurate biostratigraphic study of the Paleocene-middle Eocene calcareous nannofossils has been performed on the turbiditic successions that characterize the Northern Apennines Mt. Caio, Farini d’Olmo, Mt. Sporno and Mt. Penice Units, belonging to the “Tertiary Flysch Auctt.” and referable to the External Ligurides. This geologic complex accumulated in a link key area, located between the oceanic Ligure-Piedmontese domain and the Adria continental margin. The reference biostratigraphic scheme used in the study is the recently published calcareous nannofossil biozonation proposed for the Paleogene by Agnini et al. (2014). The obtained biostratigraphic and chronostratigraphic data suggest that further investigation is needed to clarify the tectono-sedimentary evolution and to unravel the complex architecture of the External Ligurides
( 2006). Age of the Ottone Unit in the Zignago area (external Ligurian Units, Northern Apennines): constraints from the calcareous nannofossils. 31 (1): 11-24
No full textCalibration of early-middle Toarcian nannofossil events based on high resolution ammonite biostratigraphy in two expanded sections from the Iberian Range (East Spain). Marine Micropaleontology, Vol 25 (4). 293-308
No full textCalibration of Pliensbachian calcareous nannofossil events in two ammonite-controlled sections from Northern Spain (Basque-Cantabrian area). Rivista Italiana di Paleontologia e Stratigrafia, 108, 133-152
No full textLithostratigraphy of the Villafranchian formations from the Magra Valley (Northern Apennines)
No full textThe age of the ophiolite sedimentary cover from the Mt.Gottero Unit (Internal Ligurid Units, Northern Apennines): new data from calcareous nannofossils.
No full textThe Mt. Gottero Unit (internal Ligurid Units, Northern Apennines) is characterized by a thick and well preserved sequence made up by Palombini Shales, Val Lavagna Shales and Mt. Gottero Sandstones. The Bocco Shales rest unconformably on the last formation. This sequence is interpreted as the sedimentary cover of Jurassic ophiolites. Calcareous nannofossil assemblages provide new data on the age of these formations which are significantly different from those of the previous works. The uppermost level of Palombini Shales shows a nannofacies assigned to Calculites obscurus biozone, Late Santonian. The calcareous nannofossils found in the Val Lavagna Shales allow us to attribute to this formation a Campanian-?Early Maastrichtian age while the top of the Mt. Gottero Sandstones can be referred to Paleocene p.p. age according to Passerini and Pirini (1964). Some suggestions are proposed and discussed as regards these new dat
New vs old interpretation of the Caporalino-Sant’Angelo Unit
No full textThis paper focuses on the «Alpine» CaporalinoSant’Angelo Unit outcropping between Corte and Ponte
Leccia (NE Corsica). The achieved results show that the
Caporalino-Sant’Angelo Unit is a Middle Eocene clastic
prism, accumulated in a basin located between the European
continental margin and the deforming Corsican accretionary
wedge. Consequently, the previous hypothesis that considers the Caporalino-Sant’Angelo Unit as a Middle Jurassic to
Eocene stratigraphic succession sedimented in a distensive
basin on the European continental margin is rejected, and the
early hypothesis that considers the Caporalino-Sant’Angelo
Unit as a clastic Eocene unit is partly recover
Biostratigrafia a nannofossili calcarei del Flysch ad Elmintoidi di Ottone/S.Stefano (Appennino ligure-emiliano).
No full textL'età della successione del flysch ad Elmintoidi nell'area di Caranza (Val di Vara, Appennino Settentrionale): nuovi dati sulla base del nannoplancton calcareo.
No full textCalcareous nannofossil: the key to reveal the relations between the Macigno and Monte Modino Sandstone, two widespread clastic wedges of the Northern Apennines
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