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Paleoecology and Geochronology of Uruguayan Coastal Marine Pleistocene Deposits

Published online by Cambridge University Press:  20 January 2017

Sergio Martı́nez ,
Martı́n Ubilla ,
Mariano Verde ,
Daniel Perea ,
Alejandra Rojas ,
Rosario Guérèquiz  and
Graciela Piñeiro
Sergio Martı́nez
Affiliation:
INGEPA, Facultad de Ciencias, Iguá, 4225, 11400 Montevideo, Uruguay, E-mail: smart@fcien.edu.uy
Martı́n Ubilla
Affiliation:
INGEPA, Facultad de Ciencias, Iguá, 4225, 11400 Montevideo, Uruguay, E-mail: smart@fcien.edu.uy
Mariano Verde
Affiliation:
INGEPA, Facultad de Ciencias, Iguá, 4225, 11400 Montevideo, Uruguay, E-mail: smart@fcien.edu.uy
Daniel Perea
Affiliation:
INGEPA, Facultad de Ciencias, Iguá, 4225, 11400 Montevideo, Uruguay, E-mail: smart@fcien.edu.uy
Alejandra Rojas
Affiliation:
INGEPA, Facultad de Ciencias, Iguá, 4225, 11400 Montevideo, Uruguay, E-mail: smart@fcien.edu.uy
Rosario Guérèquiz
Affiliation:
INGEPA, Facultad de Ciencias, Iguá, 4225, 11400 Montevideo, Uruguay, E-mail: smart@fcien.edu.uy
Graciela Piñeiro
Affiliation:
INGEPA, Facultad de Ciencias, Iguá, 4225, 11400 Montevideo, Uruguay, E-mail: smart@fcien.edu.uy
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Abstract

Minimum radiocarbon ages of marine Pleistocene molluscs from Uruguay range from 29,500±600 to 35,500±1900 14C yr B.P. Because knowledge of the marine Quaternary stratigraphy of Uruguay remains inadequate, no attempt is made to correlate between these deposits and recognized lithostratigraphic units. Analysis of the temperature and salinity ranges of the various molluscs suggests the establishment of a poly-euhaline fauna that inhabited waters warmer than present at the same latitude. This is supported by a northward retreat in the recent distribution of Chrysallida cf. C. gemmulosa, Nioche subrostrata, and probably Anomalocardia brasiliana. These marine Pleistocene deposits can probably be correlated with the last interglaciation (oxygen-isotopic substage 5e). At that time the fluvial-marine front of the Rio de la Plata was displaced much further northwestward than previously supposed. Chrysallida cf. C. gemmulosa and Limaria sp. are recorded in Uruguayan Quaternary deposits for the first time.

Keywords

PleistocenepaleoecologyUruguay
Type
Research Article
Information
Quaternary Research , Volume 55 , Issue 2 , March 2001 , pp. 246 - 254
Copyright
University of Washington

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