Resultats globals: 2 registres trobats en 0.02 segons.
Articles, 2 registres trobats
Articles 2 registres trobats  
20 p, 3.9 MB High resolution conodont-graptolite biostratigraphy in the Middle-Upper Ordovician of the Sierra de La Invernada Formation (Central Precordillera, Argentina) / Ortega, Gladys del Carmen (Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales) ; Albanesi, G. L., (Guillermo L.) (IANIGLA-CRICyT-CONICET. Departamento de Geología y Paleontología) ; Banchig, Aldo Luis (IANIGLA-CRICyT-CONICET. Departamento de Geología y Paleontología) ; Peralta, G.L. (Universidad Nacional de San Juan. Departamento de Geología (San Juan, Argentina))
Outcrops on the western slope of the La Invernada Range, San Juan Precordillera (W Argentina), were surveyed for lithofacial analysis and graptolite-conodont high resolution biostratigraphy. The study profile for the upper Sierra de La Invernada Formation is approximately 500 m thick and is located in the northern part of the La Invernada Range. [...]
2008 - 10.1344/105.000000249
Geologica acta, Vol. 6, Núm. 2 (Juny 2008) , p. 161-180  
15 p, 2.3 MB Trilobite-based biostratigraphic model (biofacies and biozonation) for the Middle Cambrian carbonate platform of the Argentine Precordillera / Bordonaro, Osvaldo Luís (Universidad Nacional de San Juan) ; Banchig, Aldo Luis (Universidad Nacional de San Juan) ; Pratt, Brian (University of Saskatchewan. Department of Geological Sciences) ; Raviolo, Mariana M. (Universidad Nacional de San Juan) ; Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina). Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales
A preliminary biostratigraphic model that combines trilobite biofacies and biozonation is proposed for the early Marjumian (Middle Cambrian) of the Precordillera of western Argentina. This interval involves a variety of paleogeographic-paleoenvironmental settings across the carbonate platform, ranging from its interior to exterior areas beyond the platform margin and including both open-marine and near-shore environments. [...]
Three biofacies were recognized on the basis of trilobite associations that show a marked environmental distribution: 1) The Ptychagnostidae Biofacies is represented by an assemblage exclusively dominated by agnostoids, most of them belonging to Ptychagnostus; this assemblage occurs in mudstones and calcareous shales deposited below storm wave-base seaward of the platform margin; 2) the Peronopsidae Biofacies also developed in the external areas but it occurs in limestones deposited between fair-weather and storm wave-base; this assemblage is likewise dominated by agnostoids, but instead belonging to Peronopsis, with the rest of the fauna comprising polymeroids (Dolichometopidae, Oryctocephalidae, Zacanthoididae and Alokistocaridae); 3) the Alokistocaridae Biofacies occurs in grainstones, mudstones and calcareous shales deposited between fair-weather and storm wave-base under changeable conditions located near the platform margin and in the interior. [...]

2008 - 10.1344/105.000000246
Geologica acta, Vol. 6, Núm. 2 (Juny 2008) , p. 115-129  

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