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	Provedor de dados Naturalis (2) Autor Räsänen, M.E. (2) Vonhof, H.B. (2) Wesselingh, F.P. (2) Gingras, M. (1) Guerrero, J. (1) Kaandorp, R.J.G. (1) Renema, W. (1) Romero Pittmann, L. (1) Mais... Palavra-chave Miocene (2) 38.16 (1) 38.22 (1) 42.73 (1) Amazonia (1) Chambira Formation (1) Marañon basin (1) Palaeoecology (1) Pebas Formation (1) Peru (1) Sedimentology (1) Stable isotopes (1) Stratigraphy (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 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 The nature of aquatic landscapes in the Miocene of western Amazonia: an integrated palaeontological and geochemical approach Naturalis Wesselingh, F.P.; Kaandorp, R.J.G.; Vonhof, H.B.; Räsänen, M.E.; Renema, W.; Gingras, M.. The Miocene Pebas Formation from the section Santa Rosa de Pichana (Loreto, Peru) was investigated using a combination of analyses of sedimentary facies, molluscan communities and taphonomy, and stable isotopes of both entire shells and growth bands in bivalves. Three sequences, comprising a succession of transgressive, maximum flooding and regressive/prograding intervals, are documented. Molluscs are most common in the transgressive/highstand intervals and are almost absent in regressive/prograding intervals. The fauna is dominated by endemic Pebasian species, such as Pachydon and Dyris spp. The nature of the deposits as well as the availability of oxygen varied in a predictable way within each of the sequences and determined the nature of the... Tipo: Article / Letter to the editor Palavras-chave: Miocene; Amazonia; Palaeoecology; Sedimentology; Stable isotopes; 38.22; 42.73. Ano: 2006 URL: http://www.repository.naturalis.nl/record/209732 Registros recuperados: 2 Primeira ... 1 ... Última

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