The stratigraphy and regional structure of Miocene deposits in western Amazonia (Peru, Colombia and Brazil), with implications for late Neogene landscape evolution
作者： F.P. Wesselingh , L. Romero Pittmann , M.E. Räsänen , J. Guerrero , M.C. Hoorn
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摘要: 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 provides a key quick assessment stratigraphic position Neogene in field. regional distribution twelve mollusc zones reveals structuring geological units around broad Iquitos-Araracuara anteclise. structure subsurface appears have been major factor determination present-day second lower order river courses study area. Based this work biostratigraphic framework Amazonia, including fossiliferous from adjacent basins (Putumayo, Llanos Magdalena Colombia), proposed.
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