Palaeontology and biostratigraphy of the late Palaeozoic Copacabana Group at the Angosto del Beu, Bolivia
The Copacabana Group at the Angosto del Beu, northwestern Bolivia, yielded abundant invertebrates together with fusulinids and palynomorphs that suggest an early Late Carboniferous-Early Permian age for the unit. The lower section f the group contains the fusulinid Millerella extensa Marshall, and i...
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| Autores principales: | , , , |
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| Formato: | JOUR |
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00027014_v35_n1_p87_Ottone |
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| Sumario: | The Copacabana Group at the Angosto del Beu, northwestern Bolivia, yielded abundant invertebrates together with fusulinids and palynomorphs that suggest an early Late Carboniferous-Early Permian age for the unit. The lower section f the group contains the fusulinid Millerella extensa Marshall, and is regarded as early Late Carboniferous in age. The upper section of the unit includes a palynological assemblage mainly dominated by taeniate disaccate pollen grains and monosaccates. The presence of Hamiapollenites insolitus (Bharadwaj and Salujha) Balme, and Pakkapites fusus (Bose and Kar) Menendez together with several biostratigraphically useful brachiopod species such as Kochiproductus peruvianus (d'Orbigny), Neospirifer condor (d'Orbigny), and Linoproductus cora (d;Orbigny), dates the upper section of the group as Early Permian. Comparison with the lake Titikaka and the Altiplano outcrops, and the Madre de Didos subsurface sections, provides a better picture of the palaeogeographical evolution of the Central ANdes during the Late Palaeozoic. |
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