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Articles, 2 registres trobats
Articles 2 registres trobats  
1.
11 p, 776.9 KB Review of the Cambrian Stratigraphy of the Argentine Precordillera / Bordonaro, Osvaldo Luís (Universidad Nacional de San Juan (Argentina))
The Cambrian rocks of the Argentine Precordillera are analyzed and updated providing a new stratigraphic interpretation. The lithostratigraphic assemblages provide evidence that the Precordilleran Cambrian Basin was a rimmed platform. [...]
2003 - 10.1344/105.000001589
Geologica acta, Vol. 1, Núm. 1 (2003) , p. 11-21  
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2.
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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