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Lookup NU author(s): Dr Rob Westaway
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The IGCP 449 fieldtrip in June 2003 drew attention to the Late Cenozoic fluvial sequences of western Amazonia. In Acre state in western Brazil, underlain by relatively mobile crust, rivers have incised up to 70 minto the stacked latest Miocene (?)/Early Pliocene (?) sediments of the Solimoes Group, creating staircases of fluvial terraces and indicating regional uplift on this time scale. In contrast, in western Rondonia state, the Madeira River flows through the Early Proterozoic western part of the Amazon Craton, where Late Cenozoic vertical crustal motions seem minimal. The evidence in Acre suggests that the Solimoes Group was deposited by an ancestral river system associated with the incipient development of the modem eastward Amazon drainage. (c) 2005 Elsevier Ltd. All rights reserved.
Author(s): Westaway R
Publication type: Article
Publication status: Published
Journal: Journal of South American Earth Sciences
Year: 2006
Volume: 21
Issue: 1-2
Pages: 120-134
ISSN (print): 0895-9811
ISSN (electronic): 1873-0647
Publisher: Pergamon
URL: http://dx.doi.org/10.1016/j.jsames.2005.08.004
DOI: 10.1016/j.jsames.2005.08.004
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