Miocene Palynology of the Solimões Formation (Well 1-AS-105-AM), Western Brazilian Amazonia

On the Miocene Cyprideis species flock (Ostracoda; Crustacea) of Western Amazonia (Solimões Formation): Refining taxonomy on species level

The Miocene mega-wetland of western Amazonia holds a diverse, largely endemic ostracod fauna. Among them, especially the genus Cyprideis experienced a remarkable radiation. Micropalaeontologic investigations of a 400 m long sediment core (~62 km SW Benjamin Constant, Amazonia, Brazil) permitted a taxonomic revision of about two-thirds of hitherto described Cyprideis species. We evaluate the dia...

A minute ostracod (Crustacea: Cytheromatidae) from the Miocene Solimões Formation (western Amazonia, Brazil): evidence for marine incursions?

A huge wetland (the 'Pebas system') covered western Amazonia during the Miocene, hosting a highly diverse and endemic aquatic fauna. One of the most contentious issues concerns the existence, potential pathways and effects of marine incursions on this ecosystem. Palaeontological evidences (body fossils) are rare. The finding of a new, presumably marine ostracod species (Pellucistoma curupira sp...

Miocene flooding events of western Amazonia

There is a considerable controversy about whether western Amazonia was ever covered by marine waters during the Miocene [23 to 5 Ma (million years ago)]. We investigated the possible occurrence of Miocene marine incursions in the Llanos and Amazonas/Solimões basins, using sedimentological and palynological data from two sediment cores taken in eastern Colombia and northwestern Brazil together w...

Late Miocene ostracods from the Solimões Formation (Western Amazonia): geochemical and palaeontological analyses

interbasin fluvial system is recorded in the Cretaceous Alter do Chão Formation [3], but with increased Neogene Andean uplift and tectonic subsidence in western Amazonia this regime gave way to isolated sedimentary basins east and west of the Purus

INTRODUCTION Geological evolution of the Amazon Basin. The geological history of lowland Amazonia is still poorly understood, in part because much of the Tertiary stratigraphic history has been removed by erosion and that which remains is difficult to study and access in a rainforest environment. The landscape evolution of Amazonia during the Neogene was influenced mainly by Andean tectonics an...