INVESTIGADORES
ACEÑOLAZA guillermo Federico
capítulos de libros
Título:
Proterozoico Superior y Paleozoico Inferior
Autor/es:
BENEDETTO, J.L., ACEÑOLAZA, G.F., ALBANESI, G.L., ALFARO, ET AL.
Libro:
Ameghiniana 50 años
Editorial:
Asociacion Paleontologica Argentina
Referencias:
Lugar: Buenos Aires; Año: 2007; p. 9 - 32
Resumen:
UPPER PROTEROZOIC AND LOWER PALEOZOIC FOSSILS OF ARGENTINA. This chapter aims to synthesize
the current state of knowledge on the Proterozoic and Lower Paleozoic fossils of Argentina. A wide range
of taxonomic groups are considered, especially those from marine environments. First, the paleoecological
and evolutionary significance of the Vendian-Lower Cambrian ichnofaunas is analyzed in order to understand
the early colonization of marine substrate and the role played by the microbial communities in
the ecologic structure. Paleoecology of Ordovician faunas has been the focus of numerous studies, both at
community and at biofacies scale. Some regional, basin-scale interpretations have also been proposed,
mainly in the Lower-Mid Ordovician carbonate platform of the Precordillera basin. Studies on Silurian
and Devonian assemblages are still scarce. Comparative studies among different Ordovician basins allowed
to recognize different type-assemblages defined on the basis of the overall taxonomic diversity, alpha
diversity and ecospace utilization. It is believed that the nature of these assemblages was largely controlled
by environmental dynamics at each geodynamic setting coupled with the latitudinal position of the
basins. The Evolutionary Faunas model has been critically analyzed from the evidence of Gondwanan assemblages,
suggesting that it is not entirely applicable at global scale. Paleobiogeographic analysis of
Cambrian and Ordovician faunas from Argentina led to propose that the Precordillera is a Laurentian-derived
terrane accreted to Gondwana by the Mid-Late Ordovician. A considerable progress has been made
in the biostratigraphic analysis of the rich Lower Paleozoic conodont, graptolite, trilobite and palinomorph
assemblages from the Upper Cambrian, Ordovician and Silurian of Argentina, leading to establish
accurate biostratigraphic schemas
the current state of knowledge on the Proterozoic and Lower Paleozoic fossils of Argentina. A wide range
of taxonomic groups are considered, especially those from marine environments. First, the paleoecological
and evolutionary significance of the Vendian-Lower Cambrian ichnofaunas is analyzed in order to understand
the early colonization of marine substrate and the role played by the microbial communities in
the ecologic structure. Paleoecology of Ordovician faunas has been the focus of numerous studies, both at
community and at biofacies scale. Some regional, basin-scale interpretations have also been proposed,
mainly in the Lower-Mid Ordovician carbonate platform of the Precordillera basin. Studies on Silurian
and Devonian assemblages are still scarce. Comparative studies among different Ordovician basins allowed
to recognize different type-assemblages defined on the basis of the overall taxonomic diversity, alpha
diversity and ecospace utilization. It is believed that the nature of these assemblages was largely controlled
by environmental dynamics at each geodynamic setting coupled with the latitudinal position of the
basins. The Evolutionary Faunas model has been critically analyzed from the evidence of Gondwanan assemblages,
suggesting that it is not entirely applicable at global scale. Paleobiogeographic analysis of
Cambrian and Ordovician faunas from Argentina led to propose that the Precordillera is a Laurentian-derived
terrane accreted to Gondwana by the Mid-Late Ordovician. A considerable progress has been made
in the biostratigraphic analysis of the rich Lower Paleozoic conodont, graptolite, trilobite and palinomorph
assemblages from the Upper Cambrian, Ordovician and Silurian of Argentina, leading to establish
accurate biostratigraphic schemas
PPER PROTEROZOIC AND LOWER PALEOZOIC FOSSILS OF ARGENTINA. This chapter aims to synthesize
the current state of knowledge on the Proterozoic and Lower Paleozoic fossils of Argentina. A wide range
of taxonomic groups are considered, especially those from marine environments. First, the paleoecological
and evolutionary significance of the Vendian-Lower Cambrian ichnofaunas is analyzed in order to understand
the early colonization of marine substrate and the role played by the microbial communities in
the ecologic structure. Paleoecology of Ordovician faunas has been the focus of numerous studies, both at
community and at biofacies scale. Some regional, basin-scale interpretations have also been proposed,
mainly in the Lower-Mid Ordovician carbonate platform of the Precordillera basin. Studies on Silurian
and Devonian assemblages are still scarce. Comparative studies among different Ordovician basins allowed
to recognize different type-assemblages defined on the basis of the overall taxonomic diversity, alpha
diversity and ecospace utilization. It is believed that the nature of these assemblages was largely controlled
by environmental dynamics at each geodynamic setting coupled with the latitudinal position of the
basins. The Evolutionary Faunas model has been critically analyzed from the evidence of Gondwanan assemblages,
suggesting that it is not entirely applicable at global scale. Paleobiogeographic analysis of
Cambrian and Ordovician faunas from Argentina led to propose that the Precordillera is a Laurentian-derived
terrane accreted to Gondwana by the Mid-Late Ordovician. A considerable progress has been made
in the biostratigraphic analysis of the rich Lower Paleozoic conodont, graptolite, trilobite and palinomorph
assemblages from the Upper Cambrian, Ordovician and Silurian of Argentina, leading to establish
accurate biostratigraphic schemas