1,721,110 research outputs found
Pieghe erciniche lungo il Torrente Chiarsò e limite Devoniano/Carbonifero. Hercynian folds along the Chiarsò River and the Devonian/Carboniferous boundary.
No full textLa collezione di cefalopodi nautiloidei siluriani del museo Friulano di Scienze Naturali
No full textLate and latest Famennian conodonts at the Malpasso section.
Full text linkConodont biostratigraphic and taxonomic analysis of the Malpasso section were presented by Perri & Spalletta (1991, 1998). The abundant ammonoid fauna was studied by Korn & House (1997) and Korn (1998). In Spalletta & Perri (2001) the section was proposed as possible candidate for the subdivision of the Famennian. The upper part of the section was re-sampled for conodonts and geochemical analysis by Kaiser (2005). The geochemical and conodont data have been reported also in Kaiser et al. (2008, 2009). According to Perri & Spalletta (1998) and Kaiser et al. (2009) the conodont data from the Malpasso section are perfectly correlatable with the ammonoid data of Korn (1998). ). Hartenfels & Becker (2009) on the base of the identification of a typical UD V-A1 ammonoid assemblage, including Endosiphonites sp., Kosmoclymenia lamellosa (Wedekin), Nanoclymenia sp., Nodosoclymenia sp., Rectoclymenia cf. disciforme (Schindewolf), Rect. lineare (Münster), and Procymaclymenia pudica (Czarnocki), and the opportunistic bivalve of eutrophic facies Buchiola in bed ML6k, inferred the position of the Dasberg Crisis Interval between bed ML6k and ML7. The Malpasso section is one of the reference sections of the Pal Grande Formation, showing the typical features of the formation constituted mainly of grey mudstone and wackestone here particularly rich in ammonoids (Spalletta et al., 2015)
Geometry, stratigraphy and evidences for fluid expulsion within Crommelin crater deposits, Arabia Terra, Mars
No full textFluid expulsion processes are being recognized as a relevant process in the formation of deposits hosted in Arabia Terra impact craters. Objects of this study are the Equatorial Layered Deposits (ELDs) in the Crommelin crater area (equatorial Arabia Terra). Some of the depositional processes invoked
to explain their origin include spring deposition and mud volc
anism. In this work thickness and geometries of the crater filling
sediment packages were calculated. Stratigraphic contacts of
the Crommelin area were reported within a detailed geol
ogical map.
Potentially fluids related morphologies, such as furrows and mound clusters, were described in detail using HiRISE images, MOLA)based DEMs and high resolution HiRISE DEMs. The morphometric and morphological analyses revealed that mounds and other structures occur where the ELDs are thick
er and crudely layered. Orthorectfied imagery and high)res
olution topography seems to indicate the presence of conica
l mounds within the upper portion of ELDs near the craters r
ims. Those show apical holes and are linked to elongated struc
tures resembling veins and dikes. Inside Crommelin crater, within a
flat topography, elongated structures, formerly furrows, and
concentric strata pattern, that we refer to as ridge and through,
were described. MOLA based DEMs revealed that these morphologies are inconsistent with gravitative processes.
Mounds, furrows and related structures could be linked with deep fracture systems generated during the impact that trigger, at some – poorly constrained – point after the impact itself the potential upwelling of groundwater
The Lochkovian of the Carnic Alps (Italy and Austria): conodont fauna and biostratigraphic correlations
No full text.
Famennian (Late Devonian) conodonts from the Pizzul West section (Carnic Alps, Italy)
No full textConodonts from the Pizzul West section are presented. e section is located in the Cason di Lanza/Mt. Zermula area
of the central Carnic Alps and it exposes about twenty-four metres of Upper Devonian limestone. e forty-one taxa documented
allow the discrimination of seven biozones of Frasnian and Famennian: Upper rhenana, Upper crepida, Uppermost crepida,
Lower rhomboidea, Upper rhomboidea, Lower marginifera and Lower expansa
Astrobiology vs Geology investigations: good practices in the framework of planetary missions
Full text linkThe deep link between biosignature identification and geological setting is at the foundation of astrobiological investigations on Earth and should be the same for planetary exploration. In order to constrain the analogy between the potential Earth analogue and the planetary setting, an increasingly detailed sets of analyses in an increasingly detailed scale should be performed in parallel between the Earth and the interested planetary surface. Ultimately, geological investigations are critical to correctly plan remote and in situ planetary missions aimed at assessing the habitability potential of a specific planet/setting. This is even more essential if a sample return mission is expected, in order to collect THE right samples and not just stones
Famennian (Late Devonian) conodonts from the Pizzul West section (Carnic Alps, Italy)
No full textConodonts from the Pizzul West section are presented. e section is located in the Cason di Lanza/Mt. Zermula area
of the central Carnic Alps and it exposes about twenty-four metres of Upper Devonian limestone. e forty-one taxa documented
allow the discrimination of seven biozones of Frasnian and Famennian: Upper rhenana, Upper crepida, Uppermost crepida,
Lower rhomboidea, Upper rhomboidea, Lower marginifera and Lower expansa
Conodonts across the Silurian/Devonian boundary in the Carnic Alps (Austria and Italy)
Full text linkIn the Carnic Alps, located across the border between Italy and Austria, several sections span the Silurian/Devonian boundary in different sedimentary settings, from very shallow water to moderately deep shelf. All studied sections yielded conodonts and based on the first and last occurrences of the conodont taxa in the upper part of the Upper Oul. el. detortus Zone and in the lower part of the I. hesperius Zone a detailed conodont biostratigraphic framework was able to be constructed for this interval. Comparison of data from different depositional settings demonstrates that, although the majority of species are documented everywhere in the Carnic basin, a few taxa, mainly represented by coniforms, are limited to shallow water, whereas others, mainly ozarkodinids, occur only in open sea deposit
The Pre-Variscan sequence of the Carnic Alps
No full textThe Pre-Variscan sequence of the Carnic Alps includes rocks deposited between the Middle Ordovician and the early Late Carboniferous, and represents one of the most continuous sequence of the world in that time interval. In a relatively small area it is possible to distinguish rocks deposited at
various latitudes and climate (from cold in the Ordovician to tropical in the Devonian), and in different sedimentary environments (from shallow water, including reef deposition, to basin). The lithostratigraphy of the sequence has been recently revised and formalised, and 36 formations have been discriminated
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