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Some specimens of tabulate corals from Lower Devonian of the Precordillera Central in San Juan province (Argentina) are described. These branches are assigned to the genus ParastriatoporaSokolov, 1949 and they are found close to Parastriatopora giganteaKnod, 1908. Other material, probably conspecific with this, has been reported in the bibliography such as Favosites argentinaThomas, 1905. The age...
El estudio de los braquiópodos coleccionados en la Formación la Chilca de la Precordillera Argentina revela la presencia de diez géneros pertenecientes a los Dalmanellacea, Strophomenacea, Rhynchonellacea y Retziacea. Se reconocieron doce especies, de las cuales ocho son nuevas, si bien dos de ellas no fueron formalmente definidas. Los horizontes de areniscas portadores de los fósiles estudiados se...
Two new megamorinid sponges are described from Ordovician rocks of Western Argentina. Twenty threespecimens of a new family were recovered from Arenigian beds of the San Juan Formation in La Silla and Buenaventura Luna sections. The new Family Nexospongiidae is erected to include a single genus Nexospongia composed by irregularly distributed heloclones and monaxons. The structural features of this...
Cette note présente la description des scléractiniaires en provenance des niveaux de la Formation Lajas (Bajocien inférieur), Bassin de Neuquén, situé dans la région centre-ouest de l'Argentine. La lithologie de la Formation Lajas est constituée principalement par des arénites de grain fin à grossier, déposées dans un milieu littoral intertidal. Aucune des séquences sédimentaires mentionnées dans...
The abundant collection of specimens of Natasia boliviensis (Babin & Branisa) from the Acoite Formation (Early to Middle Arenig, Northwestern Argentine) allows to analyze the pattern of dental growth and to propose the new subfamily Natasiinae, included in the Tironuculidae (Palaeotaxodonta). In the Acoite Formation two distinct populations of N. boliviensis from the late Early Arenig and Middle...
Se da a conocer la Biozona de Paraglossograptus tentaculatus en la Formatión Sierra de La Invernada,Precordillera Occidental sanjuanina, Argentina. Esta biozona, en base a sus asociaciones, fue dividida en parte inferior y parte superior. La edad de los afloramientos estudiados comprende et Arenigiano tardio — Llanvirniano temprano. Se discute là distributión vertical de los taxones, la asociación...
An Araripemys-like decorated pleurodire turtle from an outcrop of Maíz Gordo Formation (LatePaleocene) in the vicinities of Mina Aguilar (Jujuy province, Argentina) is described. It appears to be a new taxon which remains undefined. The evolution of the nuchal bone is considered. A list of African and South American pitdecorated pleurodiran turtles is given.
Remains of marine reptiles have been found in the Vaca Muerta Formation, at Trincajuera Creek (Neuquén province, Argentina) in uppermost Tithonian levels. A new specimen of the turtle [Neusticemys neuquina (Fernandez & De La Fuente,, 1988)] and a pliosaurid, are described. The Vaca Muerta organic-rich shales and marls represent the basinal sedimentary record of the Tithonian transgression in the...
This paper completes the taxonomic description of the recently discovered Permian “Glossopteris”taphofloras from Carapacha Basin and compares its entire paleofloristic assemblage with other known Permian plant associations from Argentina. Carapacha Basin was a halfgraben located in the southern region of La Pampa province (central Argentina) that received fluvial/lacustrine sediments from Early Permian...
New fossil marsupials from Paleogene levels at Antofagasta de la Sierra, in Northwestern Argentina, are described: Punadolops nov. gen. (Prepidolopidae), represented by a single species, P. alonsoi (Pascual, 1983), Bonapartherium serrensis nov. sp. (Bonapartheriidae), and an isolated lower molar tentatively assigned to Arminiheringia sp. (Proborhyaenidae). Marsupials from Antofagasta de la Sierra...
A sedimentological analysis of the basal section of the Early Cretaceous, lacustrine LagarcitoFormation at “Loma del Pterodaustro” (San Luis, Argentina) and a summary of its biological components are presented. Three sedimentological facies can be recognized in the basal sequence of the Lagarcito Formation. Fossil remains are particularly abundant in laminated claystones of a facies interpreted as...
The composition of Jurassic marine ostracod and foraminiferal assemblages from the Neuquen Basin is analysed. The absence of these microfossils from certain levels is attributed to a number of causes, such as inimical facies for their existence or for their preservation. Evidence is produced demonstrating that the absence of ostracods and the virtual absence of Foraminifera from such important Middle...
Hypsosteiromys is the only New World porcupine that shows a tendency to hypsodonty. It is recorded exclusively from the Colhuehuapian Age (Early Miocene) of central Patagonia (Argentina). In addition to the type species, a second one, Hypsosteiromys nectus (AMEGHINO, 1902), is recognized, from the southern cliff of Colhuehuapi Lake (Chubut province). It differs from the type species in the lesser...
Stable isotope (carbon and oxygen) analyses were performed on Littoridina australis shells collected from molluscan concentrations within Holocene littoral deposits along the Bonaerensian coastal area of Argentina (south-western Atlantic). Isotope data allow us to define two very different areas: the Samborombon Bay, where isotope composition of shells was mainly governed by mixing between marine...
Callistoe vincei nov. gen., nov. sp. is a new South American carnivorous marsupial (Proborhyaenidae, Borhyaenoidea) from Salta Province (Argentina). It is preliminarily described and its phylogenetic relationships with other borhyaenoids are analyzed. The holotype is a complete skull with almost complete postcranial skeleton (missing the pelvis and the tail). It is from the Lumbrera Formation (Early...
Se analizan las particularidades sedimentologicas y micropaleontologicas de la seccion basal de la Formacion Agrio (Valanginiense) en el centro-oeste de Argentina, depositada durante los estadios iniciales de un evento transgresivo. Este habria conducido a condiciones altamente eutroficas en la columna de agua, con abundancia de radiolarios y depositos de pelitas y calizas en condiciones de fondo...
The trilobite genus Huemacaspis PRIBYL and VANEK, 1980 is redescribed from well-preserved material from the Santa Gertrudis Formation (early Caradoc), Argentine Cordillera Oriental. The new species H. gallinatoensis is described and figured. Huemacaspis is widely distributed in the southern part of the Central Andean basin during the early Caradoc and it is a key taxon for the correlation of different...
A new genus and species of ''libellulid'' dragonfly, Austrolibellula noroestenia nov. gen., nov. sp., of the group Italoansida , is described. The specimen comes from the Maiz Gordo Formation (late Paleocene) that crops out in northwestern Argentina. Its phylogenetic relationships within Cavilabiata BECHLY, 1996 are discussed.
Loricariid and pimelodid-like siluriforms—along with undetermined percomorph—are described for the first time from Patagonia. Vertebrate fossils, including fish, mammals and birds, were found in beds attributed to the top of the Puerto Madryn Formation. These levels supposedly corresponded to the “Rionegrense marino” of former authors. Mammals occurring in the site suggest a Huayquerian age for the...
Upper Paleozoic sphenopsids from western Gondwana are little known. New finds were made from the Upper Carboniferous of the San Juan province (Argentina). The specimens include vegetative and fertile characters that allow the definition of a new genus and species: Gondwanites subtilis. They are characterized by slender branches bearing whorls of very thin, simple or divided leaves. Simple fertile...
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