1,721,022 research outputs found
Key-site 6: The rich paleoflora of the Ca'Viettone succession
No full textFlora Tertiaria Mediterrane
Analisi paleocarpologica nei sedimenti pliocenici del ramo occidentale del Bacino Tiberino (Umbria, Italia): considerazioni biocronologiche e paleoecologiche- La Geologia del Quaternario in Italia: temi emergenti e zone d'ombra AIQUA
No full textLeaf compressions from the late miocene sections of NW Italy: Research on an efficient, easy and quick consolidation treatment
Full text linkCompressions of fossil leaves on marl blocks soaked with water are tricky palaeobotanic findings to deal with. In fact, this peculiarity makes the findings exposed to serious degradation: the evaporation of water causes shrinkage of the matrix and the leaf leading to fragmentation, delamination and exfoliation of the fossil, until its final disappearance. The aim of this research was to identify a consolidation method which satisfies museum needs and can be utilised for all conditions of hydration of the object. Following a survey of several natural science museums in Northern Italy, Paraloid(TM) B72 and PEG4000 along with other resins never previously used on this kind of fossil were tested. At the end of the research, two products gave adequate or good results, preserving the leaf from further degradation whatever the hydration condition of the object: the acrylic resin Paraloid(TM) B72 and a polyurethane resin
The remarkable Middle Pliocene non-marine mollusc record from Ceresole d’Alba, Piedmont, north-west Italy: biochronology, palaeobiogeography and palaeoecology supported by fossil plants.
No full textA noteworthy, well-preserved non-marine mollusc fauna has been recorded from Middle Pliocene silty sediments at Ceresole d’Alba
(Piedmont,NWItaly), a site described by F. Sacco in the 19th century. The fauna is characterised by rich assemblages of terrestrial and aquatic taxa
showing a high degree of species diversity and the dominance of archaic land prosobranchs and pulmonates. A high rate of extinct taxa (at least
50%) and a good percentage of endemics are recognised. Many species are restricted to the Middle Pliocene and for some species, a Mio-Pliocene
central-western European origin is noticed. The palaeoecological features of two distinct assemblages show dominant hygrophilous and
thermophilous forest elements in the first one and prevailing freshwater taxa, testifying an environment of swamps or small water bodies, in
the latter. A direct record of ancient vegetation has been provided by fruit and seed assemblages recovered from an organic layer and from two leaf
assemblages sampled in the overlaying laminated muds. The fruit and seed assemblages clearly represent the record of a few azonal plant
communities growing very close to the deposition site. On the ground of the ecological preferences of the modern plant analogues, both leaf and
fruit assemblages indicate swamp communities poor in arboreal species. The percentage of extinct plant species is surely higher than 29% (nine
species out of 31), and most probably close to 48% (15 species out of 31). The plant assemblages provide limited climatic indications, whereas
warm-temperate and humid climate conditions are pointed out on the basis of modern preferences of several mollusc taxa. These climatic
indications agree with those obtained from rich plant assemblages of neighbouring Pliocene sites. A correlation of the recorded palaeofauna and
palaeoflora with the faunistic and floristic assemblages from the Middle Pliocene sediments of one of the most important non-marine
palaeontological sites in the Piedmont Basin, the Villafranchian type-succession at Villafranca d’Asti (RDB quarry), is inferred
New data on the lower Pleistocene (Gelasian) lignite beds of Castel San Pietro (Rieti, Central Italy)
No full textA multiproxy study of the lignite-bearing lacustrine sequence cropping out at Castel San Pietro (CSP) (Rieti, central Italy) provides new insights on the paleoenvironmental evolution of an extensional basin, located on the Tyrrhenian side of the Apennine range. The CSP fossiliferous levels reflect deposition in a stable lacustrine environment. Mammal remains collected from this locality during the past centuries include Stephanorhinus etruscus, Anancus arvernensis and the beaver Castor fiber. The co-existence of the Etruscan rhinoceros and the mastodont suggests a middle Villafranchian age (Montopoli or Coste San Giacomo Faunal Unit) for the lignite beds of CSP. New paleoflora findings are in agreement with an attribution to the Piacenzian or Gelasian age for these deposits whilst the presence of the ostracod Qinghaicypris cf. Q. riojensis suggests a time interval from Zanclean to Gelasian (between ~4.5 and ~1.8 Ma). Accordingly, the lignite beds of CSP most likely were deposited during the Gelasian (from ca. 2.5 to 1.8 Ma; from Montopoli to Coste San Giacomo FUs or possibly to Olivola FU) in forested area and warm and humid conditions
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Magnetobiostratigraphy of the Stura di Lanzo Fossil Forest succession (Piedmont, Italy)
No full textAlong the Stura di Lanzo River, 20 km north of Turin, several large stumps in growth position crop out, thus providing a well-preserved example of fossil forest. This is formed by conifers which bear the Glyptostrobus europaeus type of cone-foliage and the Glyptostroboxylon rudolphii wood-type. Stratigraphic and plant taphonomic analyses of the outcropping succession clearly indicate that the palaeoenvironment was a densely-vegetated swamp, laying nearby one or more active fluvial/deltaic channels, in which coarse cross-bedded sands were deposited. The fossils are embedded in fine-grained continental sediments referred to the «Villafranchiano» unit, a term used in the Piedmont region (north-western Italy) to designate coastal to continental deposits which conformably overlay Pliocene marine successions.
In this paper we present new data which better characterize the chronostratigraphy of the Stura di Lanzo Fossil Forest (FF) succession and similar deposits studied at the Front site. The integrated magnetobiostratigraphic approach, applied to both outcropping sections and subsurface deposits, permits to attribute the FF to the Kaena subchron. On the basis of these new magnetobiostratigraphic data, a strongly supported correlation between the FF and the Villafranchian “type-section” of Villafranca d’Asti is proposed. Furthermore, the well-constrained FF chronostratigraphy adds new data to the Middle Pliocene vegetation history, since an adequate palaeofloral documentation for the Kaena time interval was still lacking in Italy.Parco Regionale La MandriaPublished109-1252.2. Laboratorio di paleomagnetismoJCR Journalreserve
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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