1,721,082 research outputs found
Interpretazione paleoclimatica e paleoambientale di una successione sedimentaria dell’Olocene antico nella città di Terni.
No full textUno scavo ad uso civile di circa 10 m di profondità realizzato nei pressi del centro storico di Terni ha portato alla luce una potente successione sedimentaria di ambiente fluviale e fluvio-lacustre depostasi durante le prime fasi dell’Olocene, che ha permesso di raccogliere nuove informazioni sull’evoluzione geologico-ambientale recente di questa porzione del territorio di Terni, oggi urbanizzata. Molluschi ed ostracodi sono stati analizzati
Upper Pleistocene small Mammal associations in the Is Oreris Area (Iglesiente, SW Sardinia).
No full textBrittle deformations in the Upper Pleistocene deposits of the Crotone Peninsula, Calabria, southern Italy
No full textPiacenzian–Gelasian non-marine ostracods from the Dunarobba Fossil Forest (Tiberino Basin, Umbria, central Italy)
No full textThe taxonomy of some non-marine ostracod assemblages from the Dunarobba Fossil Forest area (south Tiberino Basin, Umbria, Italy) is discussed, adding to the scientific understanding of Piacenzian–Gelasian non-marine ostracods in central Italy and providing a palaeoenvironmental reconstruction of the shallow coastal lacustrine environments of the Palaeolake Tiberino. The ostracod assemblages include Darwinula stevensoni, Vestalenula cylindrica, Candona (Candona) improvisa, Candona (Neglecandona) neglecta, Candona (Neglecandona) angulata, Candona (Neglecandona) paludinica, Caspiocypris basilicii, Caspiocypris tiberina, Candonopsis kingsleii, Cyclocypris ovum, Ilyocypris bradyi, Ilyocypris decipiens, Cypris mandelstami, Zonocypris membranae quadricella, Potamocypris fulva, Cyprideis crotonensis, Cyprideis rectangularis and two new species: Hemicypris lomastroi sp. nov. and Paralimnocythere turgida sp. nov. In addition to widespread European species, the ostracod assemblages contain some rare species that were previously known from the Pliocene Paludinian Beds of Serbia. A cluster analysis applied to the ostracod frequency matrix has lead to the identification of four separate assemblages that can be attributed to several ecological niches, including emerged hydrosols, ephemeral coastal pools and a littoral lacustrine margin, which suggest a complex coastal environment
The Euxinian - Mediterranean basin connections during the Messinian: the state of the art and possible palaeogeographic and biogeographic scenarios.
No full textInterpretazione paleoclimatica e paleoambientale di una successione sedimentaria dell’Olocene antico nella città di Terni
No full textUno scavo ad uso civile di circa 10 m di profondità realizzato nei pressi del centro storico di Terni ha portato alla luce una potente successione sedimentaria di ambiente fluviale e fluvio-lacustre depostasi durante le prime fasi dell’Olocene, che ha permesso di raccogliere nuove informazioni sull’evoluzione geologico-ambientale recente di questa porzione del territorio di Terni, oggi urbanizzata. Oggetto principale della ricerca è lo studio sedimentologico e paleontologico dei depositi relativi alle due fasi di alluvionamento allo scopo di ricostruire la storia paleoclimatica e paleoambientale della sezione studiata
Environments and tectonic instability in central Italy (Garigliano Basin) during the late Messinian Lago-Mare episode: new data from the onshore Mondragone 1 well (Garigliano plain, central Italy)
No full textThe Mondragone 1 well, drilled in 1968 by Agip, for hydrocarbon exploration, cut across siliciclastic fine-to-coarse-grained
upper Miocene–Quaternary deposits, for a total depth of 2002 m. Thirteen cores have been recovered from 495 down to 2002 m.
This paper deals with both the results of the biostratigraphical analyses performed on a new sampling of the cores and the
significance of the well stratigraphy in the context of the late Messinian Lago–Mare episode in central Mediterranean.
The Lago–Mare biofacies has been characterised from 675 down to 2002 m by the ostracod assemblages that are made of species
belonging to the Loxocorniculina djafarovi Zone, as defined by Carbonnel [Carbonnel, G., 1978. La zone a Loxoconcha djaffarovi
Schneider (Ostracoda,Miocène supérieur) ou leMessinien de laVallée du Rhône. Rev.Micropaleontol. 21, 106–118.] (e.g. L. djafarovi,
Loxoconcha eichwaldi, Cyprideis anlavauxensis, Amnicythere palimpsesta, Zalanyiella venusta). Thus, the Lago–Mare deposits have a
true thickness of about 938 m since the strata show a mean dip value of 45°. Similar thickness (530 m) has been measured in the pre-
Pliocene sediments drilled at ODP Site 652, which can be correlated withMondragone 1 by the occurrence of brackish-water forms. In
both these areas syn-rift depositional processes have been suggested to explain the unusual thickness of the late Messinian sediments.
Data from seismic lines have been used to reconstruct the geometry and the structural setting of the Garigliano Basin during the
latest Messinian. Moreover, the analysis of the SP log integrated with the palaeoecological indications from the ostracod
assemblages allows us to suggest a possible sequence stratigraphy evolution of the Garigliano Basin during the late Messinian
Lago–Mare episode.
Different tectonic behaviour with differences in subsidence rates between the northern and the southern Tyrrhenian Basin have
been suggested since the uppermost Messinian syn-rift clastic wedges recognized in the onshore of northern Latium and Tuscany
show thickness lower than that drilled at the ODP Site 652 and at the Mondragone 1 well
The Tiberino “ancient” lake (Umbria, Central Italy) and its aftermath (Middle Pliocene–Early Pleistocene faunas).
No full textTaxonomic harmonization of Neogene and Quaternary candonid genera (Crustacea, Ostracoda) of the Paratethys
No full textDuring the Cenozoic, the constant northward movement of the African plate led to the division of the Tethys Ocean into two: the Palaeomediterranean and the Paratethyan branches. The latter was represented by a huge epicontinental sea and brackish to freshwater lakes that extended across central Europe and western Asia. Neogene and Quaternary ostracods from the Paratethys originated through major adaptive radiations, which gave rise to endemic brackish taxa. Unfortunately, much confusion surrounds their taxonomy, due to the quality of descriptions and images in the original literature and the incompleteness of the type material, making necessary a taxonomic revision. In this paper, we propose a systematic revision of several Paratethyan endemic candonid genera based on the analysis of the type material, new material collected from the type localities, and new fossil material from the Ponto-Caspian area. The study focuses on the description of the valve morphology and particularly on the geometric morphometric analysis of the valve outline. Thirty-three genera were taken into account of which four (Advenocypris, Candoniella, Graviacypris, Telekia) were considered to be junior synonyms of Typhlocypris, Pseudocandona or Candona. Moesiella is considered a nomen nudum. In the case of Caspiollina, Dacicandona, Liventalina and Turkmenella the scarcity of material and/or the poor descriptions reported in the literature prevented us from performing a full revision. The monospecific genus Thaminocypris possibly includes a teratological form. The remaining 23 genera were merged into nine valid, endemic, genera (Bakunella, Camptocypria, Caspiocypris, Hastacandona, Lineocypris, Pontoniella, Propontoniella, Typhlocyprella and Zalanyiella). Emended diagnoses and descriptions are proposed for these genera and a new species, Bakunella anae sp. nov., is described. This study considerably reduces the taxonomic uncertainty within the Paratethyan candonids, providing new data for the evaluation of the palaeobiodiversity of the Paratethyan domain. Finally, the palaeobiogeography of Paratethyan candonids during the Neogene and Quaternary is also discussed. http://zoobank.org/urn:lsid:zoobank.org:pub:EB9EC2D4-AFD2-428E-9958-C97F36ED7FF2
Occurrence of Vestalenula (Darwinuloidea, Ostracoda) in the Neogene of Italy, Crete and Serbia, with the description of one new species
No full textThe morphology of fossil remains of Vestalenula (Darwinuloidea, Ostracoda) from Crete
(Greece), Serbia and Italy were analysed using morphometric valve variability analysis. Three new species
were distinguished and described, Vestalenula angulata n. sp., Vestalenula longissima n. sp. and Vestalenula
pliocenica n. sp., and represent the first record of this genus in the Neogene of Italy and Serbia. Vestalenula
angulata n. sp. was recorded from the early Messinian of Tuscany, Italy (Baccinello and Velona Basins),
Vestalenula longissima n. sp. was collected in the Upper Pliocene (Gelasian) sediment core drilled in the
Sabina area (Latium, Italy), and Vestalenula pliocenica n. sp. was collected from the Early Tortonian of
Vrysses (Rethymnon Basin, Crete), from the lower Messinian deposits of the Velona Basin (Tuscany,
Italy), in the Late Pliocene of the Paludinian Beds (Middle Danube Plain) and Mazgoš deposits (Serbia),
and in the Upper Pliocene deposits of the Sabina area (Latium, Italy). Despite the freshwater character of
most living species of Vestalenula, the fossil species here analysed were found associated with halotolerant
forms, showing they could also withstand oligohaline conditions
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