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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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Ernesto Perez,Michael R. Cooper,Vladimir Covacevich
Pág. 181 - 185
RESUMEN. El hallazgo del ammonite Parahoplites gr. nutfieldiensis (J. Sowerby) en los estratos superiores de la Formacion Pabellon, Region de Atacama, indica una edad minima aptiana superior temprana para esta unidad. Lo anterior modifica la edad barremi...
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Michael R. Cooper,Ernesto Perez,Renato Reyes
Pág. 51 - 59
ABSTRACT. Trigonia nepos Paulcke is a poorly known bivalve from the late Aptian of northern Chile. Although the syntypes are lost, believed destroyed, topotype material shows it to represent a new genus of Pterotrigoniinae for which the name Paulckella g...
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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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Ernesto Perez,Renato Reyes
Pág. 217 - 227
RESUMEN. Se proponen dos nuevas especies del genero Paulckella Cooper et al. 1989, P. covacevichi y P. taverai, sobre la base de ejemplares recolectados en Molle Alto, Region de Atacama y en Quebrada El Way, Region de Antofagasta, respectivamente. P. cov...
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Ernesto Perez,Renato Reyes
Pág. 217 - 227
RESUMEN. Se proponen dos nuevas especies del genero Paulckella Cooper et al. 1989, P. covacevichi y P. taverai, sobre la base de ejemplares recolectados en Molle Alto, Region de Atacama y en Quebrada El Way, Region de Antofagasta, respectivamente. P. cov...
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Morten Smelror
Palynostratigraphy and palynofacies analyses are applied to identify transgressive-regressive sequences and changes in paleoenvironment through the Middle Jurassic?Early Cretaceous succession of the Ramså Basin on Andøya. The conglomerate, the succeeding...
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Markus J. Loegering and Alexei V. Milkov
Although the first petroleum fields in the Mozambique basin were discovered more than 60 years ago, the composition and origin of petroleum fluids in this basin are largely unknown. We studied the geochemical composition of petroleum gases and liquids fr...
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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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Marcelo Manassero,Patricia E. Zalba,Renato R. Andreis,Martin Morosi
Pág. 13 - 26
The volcaniclastic successions of the Cerro Barcino Formation (Chubut Group), of Aptian-Cenomanian age, crop out on both margins of the Chubut River with a thickness of 200 m. The Middle Member Cerro Castaño (syneruptive, 90 m) and the Upper Member, Las ...
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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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Constantino Mpodozis,Richard Allmendinger
Pág. 167 - 197
ABSTRACT. Large scale Cretaceous extensional tectonics in the Andes of northern Chile (Puquios-Sierra Fraga, 27°S). Extensional structures are commonly inferred, but seldom observed or described in the Andean Orogen. In the Andes of Northern Chile, the S...
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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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Constantino Mpodozis,Richard Allmendinger
Pág. 167 - 197
ABSTRACT. Large scale Cretaceous extensional tectonics in the Andes of northern Chile (Puquios-Sierra Fraga, 27°S). Extensional structures are commonly inferred, but seldom observed or described in the Andean Orogen. In the Andes of Northern Chile, the S...
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Ernesto Perez,Renato Reyes
Pág. 245 - 257
RESUMEN. En este trabajo se discuten las relaciones taxonomicas de los buchotrigonidos con las diversas categorias del orden Trigonioida. Se propone clasificar Buchotrigoniinae a nivel de familia en la superfamilia Myophorellacea, por presentar area anch...
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Ernesto Perez,Renato Reyes
Pág. 245 - 257
RESUMEN. En este trabajo se discuten las relaciones taxonomicas de los buchotrigonidos con las diversas categorias del orden Trigonioida. Se propone clasificar Buchotrigoniinae a nivel de familia en la superfamilia Myophorellacea, por presentar area anch...
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