Rivista Italiana Di Paleontologia E Stratigrafia 

About: Rivista Italiana Di Paleontologia E Stratigrafia is an academic journal published by University of Milan. The journal publishes majorly in the area(s): Biostratigraphy & Permian. It has an ISSN identifier of 0035-6883. Over the lifetime, 944 publications have been published receiving 13080 citations. The journal is also known as: Rivista italiana di paleontologia e di stratigrafia.

Biochronology of selected mammals, molluscs and ostracods from the middle pliocene to the late pleistocene in italy. the state of the art

Abstract: The Authors have elaborated four range charts of mammalian (large and micro), molluscs and fresh-water and brackish ostracodes faunas, for the selected Plio-Pleistocene fossiliferous localities of the Italy. A new Mammal Age (Aurelian) correlatable to late Middle and Late Pleistocene has been defined. Inside this age two Faunal Units (Torre in Pietra and Vitinia) have been defined as characteristic for Early and Middle Aurelian, while no gisements have been chosen for the late Aurelian. Biochronological units are calibrated on magnetostratigraphic and isotopic scales and by radiometric datings.

Synthesis of calcareous nannofossil events in tethyan lower and middle jurassic successions

Abstract: This paper is a synthesis of calcareous nannofossil biostratigraphy for the Lower and Middle Jurassic of the Mediterranean Province based on several sections from Northern and Central Italy. Nannofossil events were calibrated with ammonite biostratigraphy and, when necessary, ammonite-controlled sections in South East France were incorporated. Data derive from previously published biostratigraphies and unpublished data of the authors.The large data-set allowed estimates of reliability and reproducibility of single events. As a result, in the Hettangian-Bathonian interval we propose 47 main events based on diagenesis-resistant and common taxa, 17 events based on rare but ubiquitous taxa and 12 potential events requiring further investigations due to taxonomic problems and sporadic occurrence. A biostratigraphic scheme, consisting of 11 zones and 15 subzones, is proposed for the Tethyan Lower and Middle Jurassic. The proposed biostratigraphy is compared to recent schemes compiled for Portugal, Morocco, Switzerland and the Boreal Realm. Only 27 events are reproducible in various regions, but diachroneity of most events seems to derive from different ammonite biostratigraphies applied in different areas. A very high stratigraphic resolution is achieved in Italy/France for the Pliensbachian to Lower Bajocian interval. The Sinemurian and Bathonian are characterized by the lowest resolution, and very few sections with ammonite control and/or favourable lithologies are available for improvement of nannofossil biostratigraphy. This study confirms the potential of calcareous nannofossil biostratigraphy for dating Lower and Middle Jurassic successions as well as for intra- and inter-regional correlations.

Calcareous nannofossil distribution in pelagic rhythmic sediments (Aptian-Albian Piobbico core, central Italy)

Abstract: The Aptian-Albian Scisti a Fucoidi Formation from Central Italy represents a spectacular example of pelagic cyclic sedimentation. It consists of a varicolored sequence of marlstone, marly claystone, and marly limestone, with subordinate limestone. Several black shale layers are scattered throughout the formation. In order to clarify the mechanisms responsible for the rhythmicity, the Scisti a Fucoidi Formation was multidisciplinarly investigated in detail in the Piobbico core (Marche, Central Italy). Calcareous nannofossil assemblages were quantitatively analyzed, in three segments of the core in order to discern paleoceanographic fluctuations. These intervals were selected as representative lithologic end members characterized by three different types of cyclicity. On the basis of nannofossil assemblages, the following indices were identified: a Diagenesis Index (dissolution and overgrowth during burial), a Primary Dissolution Index (dissolution mainly at the sediment/water interface), Paleoecological Indices of higher and moderate fertility, of carbonate productivity, and of warmer and cooler waters. Within the Scisti a Fucoidi, the Upper Aptian, consisting of red lithotypes with interbedded green layers, is strongly affected by diagenesis. However, nannoconids still record fluctuations of carbonate productivity probably in a cooler more oxygenated paleoenvironment. Lowermost Albian maroon claystones with frequent interbedded black shales, are affected by extremely sever dissolution but a few episodes of increased carbonate productivity are recorded by changes in nannoconid abundance. Upper Albian greenish-gray marly limestones with cyclically modulated black shales, record slight rhythmic fluctualions in surface water fertility. Correlations between the distribution of nannofossil indices and lithology along with foraminifer and trace fossil patterns point to a response to orbital perturbations capable of triggering changes in ocean circulation, chemistry, and ecology. The rhythmic black shales of this interval probably accumulated because of an increase in stratification or decrease in oxygenation related to weaker temperature gradients and warmer waters, respectively.

Conodonts of the lowermost triassic of spiti, and new zonation based on neogondolella successions

Abstract: Conodonts from the lowermost Triassic Otoceras woodwardi beds and adjacent strata of Spiti are described and compared with Permian-Triassic (P-T) boundary bed faunas from elsewhere. A new pelagic zonation based on Neogondolella is introduced: the interval characterized by N. carinata-N. taylorae is subdivided into three parts based on successive first appearances of N. meishanensis , N. krystyni Orchard n. sp. and N. discreta Orchard and Krystyn n. sp., the nominal species of three successive zones. The development of these Griesbachian species involves a progressive morphological change in the configuration of the axial part (blade-carina-cusp) of the pectiniform elements. The pelagic conodont zonation is intercalibrated with the parallel zonation based on species of Hindeodus and Isarcicella , and with ammonoid faunas from Spiti, other Himalayan localities, and the Arctic. The meishanensis Zone embraces the parvus Zone and part of the overlying staeschei Zone. Strata containing O. woodwardi in Spiti carry the indices to the staeschei and krystyni zones. The Neogondolella conodont fauna associated with Otoceras differs from that of the latest Permian Changshing Limestone of China, but resembles that from the P-T boundary transition beds at Meishan, where a meishanensis Zone of restricted scope occurs beneath the parvus datum. The faunal change which introduces the characteristic Neogondolella species of the N. carinata-N. taylorae fauna occurs at the base of the P-T boundary transition beds at Meishan, the proposed boundary stratotype. Slightly above this level, the disappearance of most Neogondolella species and the introduction of new Hindeodus species coincides with a change in conodont biofacies rather than an extinction event. In the Spiti sections, the N. carinata-N. taylorae fauna, associated at first with H. parvus (as in Selong, Tibet), persists through the entire Griesbachian. Indices of the three Neogondolella zones are also recognized in the Salt Range and the Canadian Arctic. Four new conodont species are described: Neogondolella discreta, N. kazi, N. krystyni , and N. nassichuki .