Search results for "Jura"

Alma Mater: 2011/Rudens

2011

Universitātes Avīze : Alma Mater / LU Preses centrs ; LU Akadēmiskais apgāds. - Rudens (2011), 32.lpp.

JURASSIC AMMONITE ASSOCIATIONS FROM A SECTION NEAR SAMBUCA DI SICILIA (SCIACCA, SICILY).

2012

New data on Middle and Upper Jurassic ammonite successions from the Sciacca area in Southern Sicily.

2011

New data on the Jurassic evolution of the Panormide Carbonate Platform (Sicily).

2006

Taxonomic revision of two Mesozoic ammonites collections housed at the "G.G. Gemmellaro" Museum (Palermo, Sicily).

2013

Two historical collections of Mesozoic ammonites from the Tardàra Mountain (SO Sicily), housed in the “Gaetano Giorgio Gemmellaro” Museum of the University of Palermo, have been revised in this paper. The former and the older collection, studied by Mariano Gemmellaro in the 1919, it is composed of 27 specimens, attributed to 5 genera. All the taxa studied by the Author were referred to the Middle Jurassic, Macrocephalites macrocephalus Zone (early Callovian stage). The second collection, studied by Francesco Bruno in the 1954, consists of 46 specimens attributed to 13 genera. The species identified by Bruno were referred to a chronostratigraphic range spanning from Callovian to Tithonian (M…

Biostratigraphical study of the Middle-Upper Jurassic ammonite association of Stretta Arancio’s section (Southern Sicily, Italy).

2013

This stratigraphical study is part of the revision work that has been carried out for the last ten years on some Jurassic successions outcropping in Southwestern Sicily. For this purpose, a synthesis of the data on the Middle-Upper Jurassic sequence from Stretta Arancio, near Sambuca di Sicilia (Agrigento Province) have been described in this paper. The deposits, constituting the succession of this area, are part of the Monte Magaggiaro-Pizzo Telegrafo Unit that belongs to a large tectonic unit located in the outer part of the Apennine-Maghrebide chain. During the Mesozoic Era, this Unit was part of the Saccense Domain, an area palaeogeographically located along the southern margin of Tethy…

AMMONOID EVOLUTION TRIGGERED BY PALAEOGEOGRAPHIC CHANGES: ORIGIN OF OXFORDIAN SUBFAMILY PASSENDORFERIINAE (SOUTHERN TETHYS)

2011

The comparison of Middle-Upper Jurassic ammonite successions in SW Sicily (Sciacca) and Iberia shows that, during the Middle Jurassic, besides some typical Mediterranean taxa, in Sicily as well as in the Betic Ranges (S Spain) ammonoid successions contain a higher share of typical Submediterranean taxa of Ammonitina, entirely comparable to those recorded in Epicontinental areas of Eastern Iberia. From middle Oxfordian onwards instead, ammonite successions show a clear taxonomic differentiation, being dominated in Sicily by typically Mediterranean taxa (Passendorferiinae) whilst typical Submeditrerranean groups (Perisphinctinae, Oppeliidae) clearly dominant in the Iberian Range, are testimon…

The occurrence of the extinct shark genus Sphenodus in the Jurassic of Sicily

2015

During the systematic revision of some historical collections containing Mesozoic ammonites, housed at the "G.G. Gemmellaro" Geological Museum of the Palermo University, a fossil shark’s tooth has been discovered. This specimen, indicated as Lamna in the original catalogue, can be attributed to the genus Sphenodus, an extinct cosmopolitan shark ranging from Lower Jurassic rocks to the Paleocene. The specimen is part of the Mariano Gemmellaro Collection which mainly consists of Middle-Upper Jurassic ammonites coming from Tardàra Mountain, between Menfi and Sambuca di Sicilia (Agrigento Province, Southwestern Sicily). Some of the ammonite specimens were listed, but not illustrated, by M. Gemm…

Political practices of the judges in the city of Valencia. 14th -15th centuries

2020

L’anàlisi detallada dels compromisos personals i institucionals assumits públicament pels Jurats de la ciutat de València, en cronologies molt concretes, permet observar quines eren les principals preocupacions del govern municipal i avaluar en elles el grau de preeminència dels interessos del patriciat urbà. El creixent nombre de competències i obligacions adquirides per aquest executiu de govern se sincronitza amb el propi desenvolupament diacrònic de l’administració municipal. Les dades contingudes en l’acta del jurament institucional dels Jurats, documentada anualment des de 1325 als Manuals de Consells (llibres d’actes municipals) ens possibilita aquest estudi de base documental que pr…

A genetic link between synsedimentary tectonics-expelled fluids, microbial sulfate reduction and cone-in-cone structures

2018

14 pages; International audience; The late Jurassic (Tithonian) marlstones of the Boulonnais area (English Channel, France) contains diagenetic carbonate beds and nodules. Some nodules exhibit cone-in-cone structures on their lower face. We studied such nodules using various techniques of imaging and chemical (major and trace-elements) and isotopic analyses (Ccarb, Corg, O and S stable isotopes). We interpret the cone-in-cone to be the end product of carbonate-nodule formation during early diagenesis. The diagenetic carbonate precipitation was induced by microbial activity (bacteria and(?) archeae) fueled by upward-migrating fluids. Fluid expulsion was itself triggered by synsedimentary fau…