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Mostrando ítems 11-20 de 303
Final Gondwana breakup: The Paleogene South American native ungulates and the demise of the South America-Antarctica land connection
(Elsevier Science, 2014-12)
The biogeographic hypothesis more accepted today is that Antarctica (West Antarctica) and southern South America (Magellan region, Patagonia) were connected by a long and narrow causeway (Weddellian Isthmus) between the ...
Paleogene taphoflora of the entre-córregos formation (Aiuruoca Basin): foliar architecture and paleoclimaTafoflora paleógena da formação entre-córregos (Bacia de Aiuruoca): arquitetura foliar e paleoclima
(Universidade de São Paulo, Instituto de Geociências, 2013)
Nanofósseis calcários do limite Cretáceo-Paleogeno e Daniano mais antigo da Bacia de Santos (Platô de São Paulo, Brasil)CALCAREOUS NANNOFOSSILS FROM CRETACEOUS/PALEOGENE BOUNDARY AND EARLIEST DANIAN OF SANTOS BASIN (SÃO PAULO PLATEAU, BRAZIL) – ODP LEG 39-SITE 356-CORES 28/29
(Instituto de Geociências e Ciências Exatas, Universidade Estadual Paulista, 2007)
Elipsoideichnus meyeri Roselli 1987 revisited: A helicoidal fossil bee nest from the Paleogene of Uruguay
(Sociedad Española de Paleontologia, 2014-09)
The rare helicoidal trace fossil Elipsoideichnus meyeri Roselli 1987 was known only from its holotype. New materials were collected and revised, confirming the validity and interpretation of this ichnotaxon. Its previously ...
Retroarc basin reorganization and aridification during Paleogene uplift of the southern central Andes
(American Geophysical Union, 2017-03)
Tectonic development of the Andean Cordillera has profoundly changed the topography, climate, and vegetation patterns of the southern central Andes. The Cenozoic Bermejo Basin in Argentina (~30°S) provides a key record of ...
Correlation of marine beds based on Sr- and Ar-date determinations and faunal affinities across the Paleogene/Neogene boundary in southern Patagonia, Argentina
(Pergamon-Elsevier Science Ltd, 2008-09-04)
The San Julián and Monte León formations ("Patagonian") are exposed along the Atlantic coast of Patagonia, whereas in the west equivalent rocks are known as Centinela Formation. Sixteen 87Sr/86Sr measurements on the oyster ...
Upper Plate Controls on the Formation of Broken Foreland Basins in the Andean Retroarc Between 26°S and 28°S: From Cretaceous Rifting to Paleogene and Miocene Broken Foreland Basins
(American Geophysical Union, 2020-06)
Marked along-strike changes in stratigraphy, mountain belt morphology, basement exhumation, and deformation styles characterize the Andean retroarc; these changes have previously been related to spatiotemporal variations ...
Paleogene flora of the Sloggett Formation, Tierra del Fuego, ArgentinaFlora Paleógena de la formación Sloggett, Tierra del Fuego, Argentina
(Asociación Paleontológica Argentina, 2013-12-27)
In the southeastern corner of the Isla Grande of Tierra del Fuego, southernmost Argentina, small outcrops representing Late Eocene-Early Oligocene sedimentation in fluvial environments, are referred to the Sloggett Formation. ...
Revised timing of the South American early Paleogene land mammal ages
(Pergamon-Elsevier Science Ltd, 2014-05)
A new Ar/Ar date on the Las Flores Tuff (Río Chico Group, Las Flores Fm., central Patagonia, Argentina) yielded an age of 49.512±0.019Ma. This tuff, which stratigraphically overlies the mammal-bearing deposits that produced ...
Large ferruginized palaeorhizospheres from a Paleogene lateritic profile of Uruguay
(Elsevier Science, 2011-10)
It is proposed herein that columns included in the unconformity between Mercedes (Upper Cretaceous) and Asencio (Lower Eocene) formations of Uruguay, forming "caves" known since the XIX century, are large ferruginized ...