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	Provedor de dados Naturalis (2) Autor Guerrero, J. (2) Romero Pittmann, L. (2) Räsänen, M.E. (2) Wesselingh, F.P. (2) Hoorn, M.C. (1) Salo, J.A. (1) Vonhof, H.B. (1) Mais... Palavra-chave Miocene (2) Pebas Formation (2) Stratigraphy (2) 38.16 (1) 38.22 (1) 42.73 (1) Chambira Formation (1) Marañon basin (1) Mollusca (1) Peru (1) Western Amazonia (1) Mais... Tipo do documento Article / Letter to the editor (2) Ano 2006 (2) País Netherlands (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última The stratigraphy and regional structure of Miocene deposits in western Amazonia (Peru, Colombia and Brazil), with implications for late Neogene landscape evolution Naturalis Wesselingh, F.P.; Hoorn, M.C.; Guerrero, J.; Räsänen, M.E.; Romero Pittmann, L.; Salo, J.A.. A biozonation based on molluscs is proposed for Miocene deposits of western Amazonia (Peru, Colombia and Brazil), commonly referred to as the Pebas Formation. The new zonation refines existing pollen zonations and provides a key for the quick assessment of the stratigraphic position of Neogene deposits in the field. The regional distribution of twelve mollusc zones reveals a structuring of geological units around the broad Iquitos-Araracuara anteclise. The structure of the subsurface appears to have been a major factor in the determination of present-day second and lower order river courses in the study area. Based on this work a biostratigraphic framework for Miocene deposits of western Amazonia, including fossiliferous deposits from adjacent basins... Tipo: Article / Letter to the editor Palavras-chave: Stratigraphy; Mollusca; Miocene; Western Amazonia; Pebas Formation; 42.73; 38.22. Ano: 2006 URL: http://www.repository.naturalis.nl/record/209729 Landscape evolution and depositional processes in the Miocene Amazonian Pebas lake/wetland system: evidence from exploratory boreholes in northeastern Peru. Naturalis Wesselingh, F.P.; Guerrero, J.; Räsänen, M.E.; Romero Pittmann, L.; Vonhof, H.B.. This study of the type and scales of depositional processes and landscape development in western Amazonia during the Miocene is based on the description and interpretation of three boreholes from the Marañon basin (Peru). The Miocene Pebas Formation, and the overlying Marañon Formation and underlying Chambira Formation are lithologically characterised. An age calculation model indicates an Oligocene age for the Chambira Formation, and an Early – early late Miocene age for the Pebas Formation. The base of the Chambira Formation is placed at a sequence boundary and corresponds to the beginning of a regression. The succession was deposited in floodplains included in a RST and a LST under a seasonal climate with a pronounced dry season. The base of the Pebas... Tipo: Article / Letter to the editor Palavras-chave: Miocene; Marañon basin; Peru; Pebas Formation; Chambira Formation; Stratigraphy; 38.16. Ano: 2006 URL: http://www.repository.naturalis.nl/record/209731 Registros recuperados: 2 Primeira ... 1 ... Última

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