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Alexei B. Herman and Ksenia V. Domogatskaya
Three species belonging to the fern genus Ochotopteris E. Lebedev, including the new species O. lebedevii Herman et Domogatskaya, are revised, described and illustrated in this paper. The fossils come from Albian, Cenomanian, Turonian and Coniacian beds ...
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Kate Andrzejewski, Neil Tabor, Dale Winkler and Timothy Myers
Pedogenic carbonate samples collected from three Lower Cretaceous (Aptian?Albian) fossil localities in Texas and Oklahoma were analyzed to develop paleoatmospheric pCO2 estimates by measuring the stable carbon isotopes of pedogenic calcite and their co-e...
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Juan Pablo Pérez Panera
Pág. 397 - 402
Calcareous nannofossil biostratigraphic investigations of Cretaceous sediments within the southern high latitude Austral Basin, Argentina, have revealed the presence of a fragment of a silicoflagellate possibly belonging to the species Variramus aculeife...
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Maria Lidia Sanchez,Estefania Asurmendi
Pág. 329 - 348
The Candeleros Formation is represented by a succession of deposits that represent terminal fans starting to fill a foreland basin (back-arc) during the Albian. The different sub-environments of the terminal fan suggest low gradients during the onset of ...
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Augusto N. Varela,Daniel G. Poiré,Thomas Martin,Axel Gerdes,Francisco J. Goin,Javier N. Gelfo,Simone Hoffmann
Pág. 359 - 379
Despite the abundant fossil content of the Mata Amarilla Formation (Southern Patagonia, Santa Cruz Province, Argentina), its age has always generated a considerable number of questions and debates. The chronological data provided by invertebrates, dinosa...
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Victor Maksaev,Francisco Munizaga,Victor Valencia,Fernando Barra
Pág. 264 - 287
New U-Pb zircon dating of volcanic intercalations in the lower conglomeratic part of the Cerrillos Formation shows that its deposition extended in time at least from 110.7±1.7 to 99.7±1.6 Ma. The significantly younger U-Pb zircon age of 69.5±1.0 Ma obtai...
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Alain Demant,Manuel Suarez,Rita De la Cruz
Pág. 3 - 22
In the eastern part of the central Patagonian Cordillera (45°15-45°40S), northeast of the town of Coihaique, the chronology of volcanic sequences are documented by detailed field work and twelve new K-Ar dates that have established their Late Cretaceous-...
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Rubén Martínez-Pardo,Antonio Gallego,Rodolfo Martínez-Guzmán
Pág. 173 - 187
ABSTRACT. Limestones from the Polpaico locality, within the Santiago basin, on the east side of Central Chile's Coastal Range, originally considered as intermontane lake deposits, with no conclusive paleontological information, and assumed to be Cenomani...
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Gabriela Rosales,Mario Vergara,Sonia Helle,Ursula Kelm,Jimena Cucurella,Ivonne Flores,Jorge Oyarzun
Pág. 229 - 235
ABSTRACT. Mineralogy and genesis of the combarbalita in Northern Chile. Combarbalita is the local name of an ornamental stone formed by advanced argillic alteration of volcanic materials. Combarbalita is mined as a decorative stone from quarries that are...
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Luis Alberto Buatois
Pág. 145 - 165
ABSTRACT. Paleoenvironmental analysis of the slope deposits on the Kotick Point Formation (Lower Cretaceous) at 5toneley Point, James Ross Island, Antarctica (64°5). The Kotick Point Formation (Aptian?Albian), exposed at Stoneley Point, James Ross Island...
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