The oldest nautiloid cephalopod of Sardinia: Cameroceras cf. vertebrate (Eichwald, 1860) from the Arenig (Early Ordovician) of Tacconis (South East Sardinia) and remarks on the associated biota

Gnoli, Maurizio; Pillola, Gian Luigi

doi:10.1127/njgpm/2002/2002/19

Cited by 11 publications

(13 citation statements)

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“…-A siliciclastic succession (Arenarie di San Vito, Calvino, 1959) that consists of prevailing metasandstones and metasiltstones. The occurrence of widespread storm deposits and the recent discovery of a trilobite association in the Sarrabus tectonic Unit (Gnoli & Pillola, 2002;Pillola & Leone, 1997) indicate a deposition in a littoral environment, rather than in a deep water turbidite system as previously reported; the age of the succession is from the Middle Cambrian to the Early Ordovician (Naud & Pittau Demelia, 1987). -A volcanic complex where it is possible to distinguish different volcanic facies interlayered with epiclastic deposits; they are generally metandesites (Monte Santa Vittoria Formation) and rhyolitic to dacitic metaignimbrites, with a porphyric texture for the phenocrysts of Kfeldspar and quartz (Porfiroidi Formation), all with a calcalkaline geochemistry.…”

Section: Stratigraphic Outlinementioning

confidence: 58%

Geology of the Variscan basement of the Laconi-Asuni area (central Sardinia, Italy): the core of a regional antiform refolding a tectonic nappe stack

2014

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The study area extends in central Sardinia between the coordinates 8856′00′′/39855′00′′ (NW\ud corner) and 9803′00′′/39850′00′′ (SE corner). It forms part of the Sardinian Variscides that\ud are characterized here by the western-most aspect of a regional structure known as the\ud Flumendosa Antiform, which runs ENE-trending for more than 50 km along its axis. It\ud represents the envelopment of several, upright km-scale minor folds that refold the different\ud tectonic units of the Variscan Nappe zone characterized by a number of isoclinal folds, with\ud axial plane foliation and thick ductile shear zones. The antiform is in turn deformed by lateorogenic\ud extensional structures, namely asymmetric folds and narrow, low angle ductile\ud shear zones that generally reactivate earlier collisional structures.\ud The 1:12,500 scale map completes the mapping of this important regional structure,\ud meaning that a detailed survey of the entire mega-structure is now available. This enables\ud more detailed structural analyses of poly-deformed areas in low-grade metamorphic\ud conditions to be conducted, given the robust knowledge available of the lithostratigraphic\ud succession and the geometric and kinematic outlines

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Section: Stratigraphic Outlinementioning

confidence: 58%

Geology of the Variscan basement of the Laconi-Asuni area (central Sardinia, Italy): the core of a regional antiform refolding a tectonic nappe stack

2014

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“…The pre-Sardic Unconformity succession in SE Sardinia (in particular in the Sarrabus Unit; Fig. 1c) consists of a thick siliciclastic sequence (the Arenarie di San Vito Formation; Calvino, 1959) of Cambrian – Early Ordovician age (Barca, Del Rio & Pittau Demelia, 1988; Gnoli & Pillola, 2002). This sequence is characterized by intercalations of silty-clayey and arenaceous deposits with abundant sedimentary structures (flute casts, load casts, current ripples, etc.…”

Section: Cambro-ordovician Succession and Tectonics In The Sarrabus Umentioning

confidence: 99%

“…The Sardic deformation in SE Sardinia occurred during Early–Middle Ordovician time. The youngest sediments deformed by the Sardic tectonic event contain Arenig fossils (SE Sardinia: Gnoli & Pillola, 2002; SW Sardinia: Pillola, Piras & Serpagli, 2008), while the oldest formations of known age unaffected by the Sardic event are the Middle Ordovician volcanites belonging to the Monte Santa Vittoria and Porfidi grigi del Sarrabus formations (Oggiano et al 2010; Gaggero et al 2012; Pavanetto et al 2012).…”

Section: Cambro-ordovician Succession and Tectonics In The Sarrabus Umentioning

confidence: 99%

The Sardic Phase: field evidence of Ordovician tectonics in SE Sardinia, Italy

Cocco

Funedda

2017

Geol. Mag.

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Detailed geological mapping, field observations and structural analyses demonstrate that Early Ordovician ('Sardic') deformation occurred in the early Palaeozoic successions that are now incorporated in the Variscan Nappe zone of SE Sardinia. This deformation is represented by folds that formed at a shallow depth, lack a significant syn-folding axial planar foliation, and do not affect the overlying Late Ordovician - Devonian sedimentary sequence. These deformation features can be related to the development of the Sardic Unconformity and to calc-alkaline volcanism in several now-scattered terranes of Ordovician northern Gondwana. This reflects a convergent geodynamic setting that in the study sector appears to have failed to reach a continental collisional end-stage. Associating the structural data from this study with those of several published research studies, a preliminary evaluation about which tectonic setting could better fit is proposed. These conditions affected the eastern side of the northern Gondwana margin more or less contemporaneously with the opening of the Rheic Ocean and the closure of the Qaidam Ocean, before the amalgamation of the Hunia terranes

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“…Evans (2005, p. 11) considered that two taxa, Proterocameroceras contrarium Teichert and Glenister (1954) from the Emanuel Limestone of Western Australia, and a specimen identified as Cameroceras cf. vertebrale (Eichwald 1860) by Gnoli and Pillola (2002) from Sardinia were closely allied to, if not synonymous with Saloceras. Otherwise, these taxa (Saloceras, Margaritoceras and Sacerdosoceras) have been recorded from Bolivia (Cecioni and Flower 1985), Perú (herein) and England and Wales (Evans 2005).…”

Section: Stratigraphical and Palaeobiogeographical Significance Of Thmentioning

confidence: 99%

A Middle Ordovician cephalopod fauna from Cuzco Province, southern Perú and its palaeobiogeographical significance

Evans

2006

Geological Journal

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A small cephalopod assemblage collected during the 1930s by J. A. Douglas from the Middle Ordovician San José Formation of Cuzco Province is redescribed. Although small in number (four taxa) and poorly preserved, this assemblage contains a representative of the ellesmerocerid family Eothinoceratidae and a probable member of the Arionoceratidae (Orthocerida). One taxon may be closely related to Protocycloceras harringtoni Cecioni from northern Argentina. The presence of a particular group of eothinoceratids, here and elsewhere in South America indicate a link with western Gondwana. The relatively diminutive size of the arionoceratids suggests homeomorphy with those Silurian forms associated with a pelagic habitat and indicates a relatively offshore site for this assemblage.

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The oldest nautiloid cephalopod of Sardinia: Cameroceras cf. vertebrate (Eichwald, 1860) from the Arenig (Early Ordovician) of Tacconis (South East Sardinia) and remarks on the associated biota

Cited by 11 publications

References 0 publications

Geology of the Variscan basement of the Laconi-Asuni area (central Sardinia, Italy): the core of a regional antiform refolding a tectonic nappe stack

Geology of the Variscan basement of the Laconi-Asuni area (central Sardinia, Italy): the core of a regional antiform refolding a tectonic nappe stack

The Sardic Phase: field evidence of Ordovician tectonics in SE Sardinia, Italy

A Middle Ordovician cephalopod fauna from Cuzco Province, southern Perú and its palaeobiogeographical significance

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