Late Miocene Tidal Deposits in the Amazonian Foreland Basin

Late Miocene tidal sediments of Acre, Brazilian Amazonia, were deposited in an embayment or interior seaway located in the sub-Andean zone. This late Tertiary embayment system may once have connected the Caribbean with the South Atlantic. The tidal coasts of the embayment-seaway have provided an ave...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 1995-07, Vol.269 (5222), p.386-390
Main Authors: Räsänen, Matti E., Linna, Ari M., José C. R. Santos, Negri, Francisco R.
Format: Article
Language:English
Subjects:
Couplets
Earth sciences
Earth, ocean, space
Exact sciences and technology
Fauna
Floods
Geology
Geology, Stratigraphic
Grain size
Migration
Mineralogy
Miocene
Miocene Epoch
Mud
Oceans
Paleogeography
Pebbles
Sand
Sediments
Straits
Stratigraphy
Water
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Summary:Late Miocene tidal sediments of Acre, Brazilian Amazonia, were deposited in an embayment or interior seaway located in the sub-Andean zone. This late Tertiary embayment system may once have connected the Caribbean with the South Atlantic. The tidal coasts of the embayment-seaway have provided an avenue for the earliest waif (over water) dispersal phases of the great American biotic interchange in the late Miocene. The subsequent change from semimarine to terrestrial environments is of value in assessing the importance of earlier hypotheses on the evolution of the western Amazonian landscape and gives insight into the formation of several observed biogeographic patterns, especially of aquatic biota.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.269.5222.386