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Registros recuperados: 7
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Abundance and distribution of Lithophaga (Mytilidae) in extant and fossil oysters: taphonomic and paleobiological implications Ameghiniana
Mauna,Cecilia; Casadío,Silvio; Parras,Ana; Pascual,Marcela.
In this study we analyze the abundance and distribution patterns of Lithophaga patagonica in valves of Ostrea puelchana and compare them to those of Lithophaga sp. observed on the fossil species " Ostrea " patagonica and " Ostrea " alvarezii from the late Miocene Puerto Madryn Formation. No specimen of the fossil oysters showed borings of Lithophaga sp. on the interior surface of the valves. This suggests that they were produced while the oysters were still living and, at the same time, that the oyster beds were buried rapidly after death. In Ostrea puelchana the boring abundance was significantly higher for the left valve and, within it, the areas more heavily bored were the umbones and the platform. The same results were obtained for valves of " Ostrea "...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Lithophaga; Bioerosion; Oysters; Taphonomy; Miocene; Argentina.
Ano: 2005 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142005000200010
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Afinidades paleobiogeográficas de los invertebrados cretácicos de la Cuenca Neuquina Ameghiniana
Aguirre-Urreta,M. Beatriz; Casadío,Silvio; Cichowolski,Marcela; Lazo,Darío G.; Rodríguez,Débora L..
Sobre la base del conocimiento sistemático de las faunas de invertebrados marinos de la Cuenca Neuquina se analizan sus afinidades paleobiogeográficas durante los dos intervalos marinos del Cretácico. El primero corresponde al Berriasiano-Barremiano temprano, durante el cual la cuenca estuvo conectada con el océano Pacífico a través de un arco volcánico. El segundo, más acotado, corresponde al Maastrichtiano, momento en el cual la cuenca estuvo conectada con el océano Atlántico. Durante el primer intervalo los nautílidos son monoespecíficos y muestran afinidades puramente andinas a este nivel, mientras que los amonoideos están representados por seis familias de afinidades tethyanas. Se encuentran 20 géneros y subgéneros que van reemplazándose a través del...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Moluscos; Crustáceos decápodos; Equinoideos; Tethyano; Wedelliano; Andino; Endémico.
Ano: 2008 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142008000300006
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Late Maastrichtian-Danian Mytilids and Pinnids (Mollusca: Bivalvia) from Northern Patagonia, Argentina Ameghiniana
Griffin,Miguel; Parras,Ana; Casadío,Silvio.
The Upper Cretaceous - lower Paleogene rocks from northern Patagonia yield a rich fauna of marine mollusks that may be useful in elucidating paleobiogeographic and paleoenvironmental changes taking place across the K/P boundary in the region. Most of the mollusk faunas remain poorly understood, as the preservation is generally deficient. This paper describes three new species of mytilids (Septifer mayai n. sp., Mytilaster ? edseli n. sp. and Gregariella amara n. sp.), and records four species of pinnids, one of which is new (Plesiopinna pampeana n. sp.). All the material comes from the Maastrichtian Jagüel Formation, and the Maastrichtian/Danian Roca Formation, exposed in the provinces of Río Negro, Mendoza and La Pampa (Argentina). A survey of the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bivalvia; Mytilids; Pinnids; Cretaceous/Paleogene boundary; Argentina.
Ano: 2008 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142008000100009
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Maastrichtian and Danian species of Turkostreini (Ostreidae, Crassostreinae) from the Neuquén Basin, Argentina Ameghiniana
Griffin,Miguel; Casadío,Silvio; Parras,Ana.
The record of Turkostrea damboreneae nom. nov. and Cubitostrea primordialis n. sp. in the Maastrichtian Jagüel and Roca Formations and of Turkostrea argentina n. sp., in the Danian beds of the Roca Formation reveals that the two genera involved have a history that reaches back into the Late Cretaceous in northern Patagonia. Turkostrea damboreneae nom. nov. and Cubitostrea primordialis n. sp. are the two oldest representatives of the genera in which they belong. The two species of Turkostrea show clear affinities with other species of this genus that thrived in the Paleogene of the Northern Hemisphere. Cubitostrea primordialis n. sp. is closely allied to the previously known Paleocene species common in the region. While Turkostrea appears to have survived...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Oysters; Systematics; Cretaceous-Paleogene boundary; Neuquén Basin; Argentina.
Ano: 2005 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142005000200001
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New dinoflagellate cyst species from the Calafate Formation (Maastrichtian), Austral Basin, Argentina Ameghiniana
Guler,M. Verónica; Guerstein,G. Raquel; Casadío,Silvio.
The aim of this paper is to erect four new dinoflagellate cyst species from the Maastrichtian Calafate Formation, Austral Basin, Argentina. Andalusiella spinosa sp. nov. is strongly acrocavate and possesses a periphragm covered with spines. Palaeocystodinium pilatum sp. nov. has a periphragm densely covered with fine, flexuous, hair-like projections, shortening towards the end of the horns, and a finely granulate endophragm. The large peridinialean Caligodinium perforatum sp. nov. shows the hypocystal archeopyle typical for the genus, with a simple triplacoid opercular piece and a microfoveolate autophragm surrounded by a perforate flocculent calyptra. Hafniasphaera australis sp. nov. is differentiated from other species of the genus Hafniasphaera by the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dinoflagellate cysts; Maastrichtian; Calafate Formation; Austral Basin; Argentina.
Ano: 2005 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142005000200012
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Paleontología y sedimentología de las rocas del eoceno medio expuestas en el área de lago argentino, provincia de Santa Cruz, Argentina Ameghiniana
Casadío,Silvio; Griffin,Miguel; Marenssi,Sergio; Net,Laura; Parras,Ana; Rodríguez Raing,Martín; Santillana,Sergio.
Los estudios sedimentológicos y paleontológicos realizados en rocas asignadas a la Formación Man Aike, expuestas en la estancia 25 de Mayo, al sur de Calafate, provincia de Santa Cruz, Argentina, sugieren que esta unidad representa la evolución de un valle inciso desde ambientes fluviales a marinos durante el Eoceno medio tardío. En la base de la sucesión se registra una discordancia que corresponde a canales fluviales que cortan a las areniscas maastrichtianas de la Formación Calafate. La fauna de invertebrados (mayormente moluscos) ilustrada en este trabajo fue coleccionada de capas de conchillas que se interpretan como parte de diferentes superficies de ravinement mareal. La fauna incluye braquiópodos terebratúlidos, bivalvos de las familias...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Eoceno; Valle inciso; Bivalvos; Gastrópodos; Braquiópodos; Patagonia.
Ano: 2009 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142009000100003
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West Antarctic Rift system: a possible New Zealand-Patagonia Oligocene paleobiogeographic link Ameghiniana
Casadío,Silvio; Campbell,Nelson; Taylor,Paul; Griffin,Miguel; Gordon,Dennis.
Tipo: Info:eu-repo/semantics/report
Ano: 2010 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142010000100012
Registros recuperados: 7
Primeira ... 1 ... Última
 

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