Papers by Maurizio Gaetani
The biostratigraphy, fusulinid and microfacies from the Per-mian succession of the Shaksgam Valle... more The biostratigraphy, fusulinid and microfacies from the Per-mian succession of the Shaksgam Valley (Aghil and Karakorum ranges) are described. The succession starts with a terrigenous prism, consisting of shale and siltstone covered by litharenite, several hundreds m-thick. They represent an alluvial to shore-face terrigenous prism, on which gradually progrades a marine shallow water complex with bioclastic calcarenite and wackestone/mudstone. A reappraisal of the litharenite also with hummocky cross-lamination is overlain by progressively deeper mudstone/wackestone, and cherty limestone. Very thick calciruditic and pebbly limestone bodies are interbedded in the cherty limestone, in turn newly overlain by marls and shales, followed by thin bedded mudstone. Four fusulinid assemblages are identified, bottom to top: Mono-diexodina (Yakhtashian-Bolorian), Leeina-Chalaroschwagerina (Bolo-rian), Cancellina-Pseudodoliolina-Parafusulina (Late Kubergandian), and Dunbarula-Codonofusiella (Late Murgabian-Midian) respectively. Two new Leeina species are described, Leeina karakorumensis Leven, and Leeina ellipsoidalis Leven.
The Bithynian substage of the Anisian stage (Middle Triassic) was established by Assereto in the ... more The Bithynian substage of the Anisian stage (Middle Triassic) was established by Assereto in the Gebze area (Kocaeli peninsula, northwestern Turkey), within the middle member of Nodular Limestone formation, now included in the Tepeköy Formation. The rich fauna, represented by conodonts, foraminifera and ammonoids, was described since a long time. The brachiopod fauna occurring in the Bithynian type-section is here revised. It consists of four species: Austriellula kavakensis (Arthaber, 1914), Holchorhynchella edhemi (Toula, 1896), Ptychomentzelia propontica (Toula, 1896), and Angustothyris angustaeformis (Böckh, 1872). The fauna is mostly endemic, with high number of specimens for the first three quoted species. Rare specimens of P. propontica occur also in the lower member of the Nodular Limestone, who delivered the conodont Neogondolella regalis, suggesting an Aegean age. The brachiopod fauna of the Bithynian substage continues upward with rare specimens in the lowermost part of the overlying Pel-sonian succession. In the Illyrian, very rare " Rhynchonella " tscharkensis Arthaber, 1914, and Koeveskallina koeveskalyensis (Stur, 1865) were found. The Bithynian brachiopod fauna from Gebze has no counterpart in the Europe and in the surrounding regions, like Northern Caucasus and Aghdarband in Iran, even if some of the ammonoids found in Gebze are also present in these areas.
Mémoires du Muséum national d'histoire naturelle, 1998
RefDoc Refdoc est un service / is powered by. www.cnrs.fr www.inist.fr Bookmark and Share. Découv... more RefDoc Refdoc est un service / is powered by. www.cnrs.fr www.inist.fr Bookmark and Share. Découvrir / Discover. Refdoc. EXPORT. Mendeley to Mendeley. EndNote to EndNote. INIST-CNRS. 2, Allée du Parc de Brabois CS 10310 F-54519 Vandoeuvre-lès-Nancy Cedex France Phone: +33 (0)3 83 50 46 64 Fax: +33 (0)3 83 50 46 66. Nous contacter Contact us. Faire une nouvelle recherche Make a new search. Commander ce document, ok. Order this document, ok. Titre du document / Document title. The Mesozoic of the Mangyshlak (West Kazakhstan ...
Palaeogeography Palaeoclimatology Palaeoecology, 2000
Magnetostratigraphic and biostratigraphic data are presented from the Anisian (Middle Triassic) P... more Magnetostratigraphic and biostratigraphic data are presented from the Anisian (Middle Triassic) Peri-Tethyan Edivetur section of northwestern Bulgaria. A dual-polarity component of magnetization carried by magnetite delineates a magnetic stratigraphy of mainly reversed polarity. Magnetozones are dated by means of foraminifer and conodont biostratigraphy. Data from Edivetur are compared with data from Middle Triassic Tethyan limestone sections with the aim of contributing to the completion of the Middle Triassic magnetic polarity time scale. We also propose that paleomagnetic data from Edivetur can be used as proxy data for the paleogeographic position of the Moesian platform. The Moesian platform was located at 21-24°N along the southern margin of Europe. It was probably marginally separated, but not detached or rotated away from Europe by the North Dobrugea transtensional trough, which is interpreted as a back-arc basin resulting from the northward subduction of the Neo-Tethys ( Vardar) or Paleo-Tethys ocean. Paleomagnetic data from this study and other minor tectonic elements are used to generate a paleogeographic sketch map of the Pangea-bounded western Tethys and Peri-Tethys at Middle/early Late Triassic time.
Abstract The clastic succession, 90 to 105 m-thick, bracketed between Permian volcanics and Middl... more Abstract The clastic succession, 90 to 105 m-thick, bracketed between Permian volcanics and Middle Triassic dolostones, discontinuously exposed on the slopes of Mt. San Giorgio, across Canton Ticino (Switzerland) and Province of Varese (Italy), has recently been attributed to the Bellano Formation (Anisian) based on stratigraphic position. Due to the poor fossil content of the succession, in the present paper an improvement in facies analysis was attempted through the petrography of sandstone layers. With this method, it has been possible not only to recognize an ordered succession of petrologic intervals that correlates, but for some local peculiar character, with the classical succession of central Lombardy, but also, in particular, to distinguish two lithozones, in the basal and middle parts of the terrigenous succession, that can be referred to the lower members (Prato Solaro and Ca' San Marco Members, largely Induan in age) of the Servino. The upper part of the clastic succession, instead, can be correctly referred to the Bellano Formation, because in it both a palynomorph association of Anisian (probably early Anisian) age, and all of the three petrofacies described in the literature into the Bellano Formation outcropping in the type-area between Lake Como and Valsassina, are recognized.
Rivista Italiana di …, 2007
The results of the Peri-Tethys Programme are summarized. Hundreds of scientists were involved, pr... more The results of the Peri-Tethys Programme are summarized. Hundreds of scientists were involved, producing several hundred papers and congress presentations. Six memoirs, and six special issues were published in International Journals or are in press. The major cooperative product is the Atlas with 24 paleogeographic maps.
Geological Society London Special Publications
The Elikah River section spanning the Lopingian (Late Permian) to the Griesbachian (Early Triassi... more The Elikah River section spanning the Lopingian (Late Permian) to the Griesbachian (Early Triassic) time interval in the Central Alborz Mountains (north Iran) was sampled for ostracod analysis. We report 79 species distributed among 38 genera. Four new species are described: Acratia? pervagata Forel sp. nov., Microcheilinella alborzella Forel sp. nov., Basslerella superarella Crasquin sp. nov. and Cavellina nesenensis Crasquin sp. nov. The ontogeny of 13 species is described and
sexual dimorphism in the genus Microcheilinellais here undoubtedly recognized for the first time. Six species show
precocious sexual dimorphism of their carapace as early as A-5 juvenile. The Lilliput effect is for the first time recorded and
quantified for two species. Rare long-time span Palaeocopida
species, known throughout the entire Permian, document relatively long-term evolution, including the size and growth rate modifications associated with the earlier appearance of carapace sexual dimorphism through time. These patterns might be related to the Guadalupian–Lopingian events and/or to climatic modifications occurring during the Permian interval.
Geologische Rundschau, 1996
During the summer of 1992 a geological expedition crossed the northern Karakorum range in norther... more During the summer of 1992 a geological expedition crossed the northern Karakorum range in northern Pakistan, from the Chitral to Karambar valleys, from the villages of Mastuj to Imit. Some of the areas visited were geologically unknown. A number of structural units were crossed, belonging to the Karakorum block or to other crustal blocks north of it. They are: (a) the axial batholith, in which three plutonic bodies have been identified, and (b) the northern sedimentary belt (NSB), in which three major tectonostratigraphic units form thrust stacks dipping to the north.
Eclogae Geologicae Helvetiae, 2005
The Volissos Turbidites (also known as Chios Mélange) are a thick Palaeozoic wildflysch sequence ... more The Volissos Turbidites (also known as Chios Mélange) are a thick Palaeozoic wildflysch sequence that crops out on the Greek island of Chios. It consists of chert, limestone and volcanic olistholits floating in a siliciclastic turbiditic matrix. During the Early Carboniferous (Mississippian), these turbidites were severely deformed and structurally thickened probably at the toe of an accretionary wedge. Whereas there are many studies on the fossiliferous content of the limestone olistoliths, scant attention was given to the cherts. We report here for the first time some radiolarian and conodont assemblages from the chert olistholiths (ribbon radiolarites) embedded in the siliciclastic sequence of the Volissos Turbidites.
Palaeogeography, …, Jan 1, 2000
Magnetostratigraphic and biostratigraphic data are presented from the Anisian (Middle Triassic) P... more Magnetostratigraphic and biostratigraphic data are presented from the Anisian (Middle Triassic) Peri-Tethyan Edivetur section of northwestern Bulgaria. A dual-polarity component of magnetization carried by magnetite delineates a magnetic stratigraphy of mainly reversed polarity. Magnetozones are dated by means of foraminifer and conodont biostratigraphy. Data from Edivetur are compared with data from Middle Triassic Tethyan limestone sections with the aim of contributing to the completion of the Middle Triassic magnetic polarity time scale. We also propose that paleomagnetic data from Edivetur can be used as proxy data for the paleogeographic position of the Moesian platform. The Moesian platform was located at 21-24°N along the southern margin of Europe. It was probably marginally separated, but not detached or rotated away from Europe by the North Dobrugea transtensional trough, which is interpreted as a back-arc basin resulting from the northward subduction of the Neo-Tethys ( Vardar) or Paleo-Tethys ocean. Paleomagnetic data from this study and other minor tectonic elements are used to generate a paleogeographic sketch map of the Pangea-bounded western Tethys and Peri-Tethys at Middle/early Late Triassic time.
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Papers by Maurizio Gaetani
sexual dimorphism in the genus Microcheilinellais here undoubtedly recognized for the first time. Six species show
precocious sexual dimorphism of their carapace as early as A-5 juvenile. The Lilliput effect is for the first time recorded and
quantified for two species. Rare long-time span Palaeocopida
species, known throughout the entire Permian, document relatively long-term evolution, including the size and growth rate modifications associated with the earlier appearance of carapace sexual dimorphism through time. These patterns might be related to the Guadalupian–Lopingian events and/or to climatic modifications occurring during the Permian interval.
sexual dimorphism in the genus Microcheilinellais here undoubtedly recognized for the first time. Six species show
precocious sexual dimorphism of their carapace as early as A-5 juvenile. The Lilliput effect is for the first time recorded and
quantified for two species. Rare long-time span Palaeocopida
species, known throughout the entire Permian, document relatively long-term evolution, including the size and growth rate modifications associated with the earlier appearance of carapace sexual dimorphism through time. These patterns might be related to the Guadalupian–Lopingian events and/or to climatic modifications occurring during the Permian interval.