Geologica acta

Geologica acta Encontrados 8 registros  La búsqueda tardó 0.00 segundos. 
1.
3 p, 160.4 KB Lower Paleozoic biostratigraphy of South America : new contributions and advances / Albanesi, G. L. Guillermo L. (Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales) ; Ortega, Gladys del Carmen (Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales) ; Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina). Museo de Paleontología
2008 - 10.1344/105.000000245
Geologica acta, Vol. 6, Núm. 2 (Juny 2008) , p. 111-113  
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  
3.
15 p, 2.5 MB New late Tremadocian (Early Ordovician) conodont and graptolite records from the southern South American Gondwana margin (Eastern Cordillera, Argentina) / Zeballo, Fernando J. (Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales) ; Albanesi, G. L. Guillermo L. (Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales) ; Ortega, Gladys del Carmen (Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales)
New late Tremadocian (Early Ordovician) conodont and graptolite faunas from the eastern and central belts of the Eastern Cordillera (Jujuy Province, northwestern Argentina) are reported. The conodont fauna includes the guide species Paltodus deltifer pristinus, Paltodus deltifer deltifer, and Acodus deltatus (sensu lato), in association with other taxa, and the graptolites Aorograptus victoriae, Ancoragraptus cf. [...]
2008 - 10.1344/105.000000247
Geologica acta, Vol. 6, Núm. 2 (Juny 2008) , p. 131-145  
4.
14 p, 1.0 MB An Early Ordovician (Floian) Conodont Fauna from the Eastern Cordillera of Peru (Central Andean Basin) / Gutiérrez-Marco, Juan Carlos (Centro Superior de Investigaciones Científicas. Instituto de Geología Económica) ; Albanesi, G. L. Guillermo L. (Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales) ; Sarmiento, Graciela Noemí (Universidad Complutense de Madrid. Facultad de Ciencias Geológicas) ; Carlotto Caillaux, Victor Santiago (Universidad Nacional San Antonio Abad del Cusco. Departamento de Geología) ; Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina). Museo de Paleontología
Late Floian conodonts are recorded from a thin limestone lens intercalated in the lower part of the San José Formation at the Carcel Puncco section (Inambari River), Eastern Cordillera of Peru. The conodont association includes Gothodus costulatus LINDSTRÖM, Protopanderodus rectus (LINDSTRÖM), Drepanoistodus basiovalis (SERGEEVA), Drepanoistodus forceps (LINDSTRÖM), Drepanodus arcuatus PANDER, Trapezognathus diprion (LINDSTRÖM), Erraticodon patu COOPER, and Ansella cf. [...]
2008 - 10.1344/105.000000248
Geologica acta, Vol. 6, Núm. 2 (Juny 2008) , p. 147-160  
5.
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  
6.
10 p, 1.6 MB Silurian (Llandovery) monograptids from the Vargas Peña Formation (Paraná Basin, Eastern Paraguay) / Uriz, Norberto J. (Museo de La Plata. División Geología) ; Beatriz Alfaro, Marta (Museo de La Plata. División Geología) ; Galeano Inchausti, J.C. (Paraguay. Ministerio de Obras Públicas y Comunicaciones. Subsecretaria de Minas y Energía)
The Itacurubí Group is a siliciclastic Silurian sequence exposed in eastern Paraguay (Paraná Basin). It includes from bottom to top the Eusebio Ayala, Vargas Peña and Cariy formations. The entire sedimentary group has yielded a rich association of invertebrates, ichnofossils and palynomorphs. [...]
2008 - 10.1344/105.000000250
Geologica acta, Vol. 6, Núm. 2 (Juny 2008) , p. 181-190  
7.
20 p, 3.9 MB First record of Early Devonian (Lochkovian) flora from the Santa Rosa Formation - Alarache, Southern Bolivia / Di Pasquo Lartigue, Maria (Universidad de Buenos Aires. Departamento de Geología) ; Noetinger, Sol (Universidad de Buenos Aires. Departamento de Geología)
New information on plants and palynomorphs from Angosto de Alarache, South Bolivia, is presented. The plant remains appear at the base of the section. Dichotomizing sterile forms are assigned to Hostinella sp. [...]
2008 - 10.1344/105.000000251
Geologica acta, Vol. 6, Núm. 2 (Juny 2008) , p. 191-210  
8.
6 p, 196.2 KB Book review / Cabrera, L. (Universitat de Barcelona. Facultat de Geologia) ; Calafat Frau, Antonio (Universitat de Barcelona. Facultat de Geologia) ; Gimeno Torrente, Domingo (Universitat de Barcelona. Facultat de Geologia) ; Liesa Torre-Marín, Monserrat (Universitat de Barcelona. Facultat de Geologia) ; Proenza, J. (Universitat de Barcelona. Facultat de Geologia) ; Sàbat i Montserrat, Francesc (Universitat de Barcelona. Facultat de Geologia) ; Sáez, A. (Universitat de Barcelona. Facultat de Geologia) ; Santanach i Prat, Pere F. (Universitat de Barcelona. Departament de Geodinàmica i Geofísica) ; Fernández Turiel, J. L. (Centro Superior de Investigaciones Científicas. Institut de Ciències de la Terra Jaume Almera) ; Giralt, S. (Centro Superior de Investigaciones Científicas. Institut de Ciències de la Terra Jaume Almera) ; Pérez Estaún, Andrés (Centro Superior de Investigaciones Científicas. Institut de Ciències de la Terra Jaume Almera)
Teresa MORENO and Wes GIBBONS (eds. ), The Geology of Chile. London: Geological Society, 2007.
2008
Geologica acta, Vol. 6, Núm. 2 (Juny 2008) , p. 211-216  

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