Hystricognath rodents from the Pinturas Formation, Early–Middle Miocene of Patagonia, biostratigraphic and paleoenvironmental implications

Kramarz, Alejandro Gustavo; Bellosi, Eduardo S.

doi:10.1016/j.jsames.2004.10.005

Cited by 63 publications

(66 citation statements)

References 30 publications

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“…However, different scholars have pointed out that typical Santacrucian mammals do occur in slightly older inland horizons, indicating that the Santacrucian SALMA probably extends to somewhat earlier ages. These include Andean and central Patagonian outcrops, as for example the upper succession of the eolian-volcaniclastic Pinturas Formation in the valley of the Pinturas River (Kramarz and Bellosi, 2005), and exposures at Lake Posadas/Puyrredón (Hatcher, 1903;Blisniuk et al, 2006), Río Chalia/Sehuén (Hatcher, 1903), Estancia El Carmen, Lake Cardiel, and Gobernador Gregores (Bown and Fleagle, 1993;De Barrio et al, 1994;Kramarz and Bellosi, 2005;Fleagle et al, 2012). Other localities with potential Santacrucian fossils are El Trébol and Camerón (Bordas, 1939), Meseta Latorre (Brandmayr, 1945), and the Cerro Boleadoras Formation in the valley of the Jeinimeni and Zeballos Rivers, south of Lake General Carrera/Buenos Aires (Ugarte, 1956;Vucetich, 1994;Scillato-Yané and Carlini, 1998.…”

Section: An Overview Of the Pansantacrucian Fossil Faunasmentioning

confidence: 99%

“…The Pinturan fauna (Pinturan association sensu Kramarz and Bellosi, 2005) was recognized in elements of the old 'Astrapothericulan' fauna of Ameghino (1906), a composite fossil assemblage recovered in the headwaters of the Pinturas River, lacking an accurate geographic and stratigraphic position (Ameghino, 1900(Ameghino, -1902(Ameghino, , 1906. Kramarz and Bellosi (2005) and middle successions of the Pinturas Formation (Bown and Larriestra, 1990;Bown and Fleagle, 1993;Fig. 1), and characterised it by its more ancestral constitution, bearing more primitive elements than those of the classic Santacrucian localities along the Atlantic Coast.…”

Section: An Overview Of the Pansantacrucian Fossil Faunasmentioning

confidence: 99%

“…1), and characterised it by its more ancestral constitution, bearing more primitive elements than those of the classic Santacrucian localities along the Atlantic Coast. While most researchers have traditionally considered the Pinturas ('Astrapothericulan') fossils to be simply a local Santacrucian age fauna (Pascual and Odreman Rivas, 1971;Marshall et al, 1983;Pascual et al, 1985Pascual et al, , 1996, other scholars have suggested that it could represent an independent biochronologic unit ('Pinturan' age/sub-age), placed between the Colhuehuapian and the Santacrucian SALMAs (Ameghino, 1906;Kraglievich, 1930;Castellanos, 1937;Brown and Fleagle, 1993;Kramarz and Bellosi, 2005;. However, direct 40 Ar/ 39 Ar dating from the Pinturas Formation bracketed between 17.99 and 16.80 Ma , demonstrated that this lithostratigraphic unit is partially coeval with the Santa Cruz Formation in the coastal localities.…”

Section: An Overview Of the Pansantacrucian Fossil Faunasmentioning

confidence: 99%

“…Due to the disproportionate number of named species within this genus, an exhaustive revision of the more abundant and typological Argentinean materials would be necessary before a specific assignment can be made for the Magallanean specimens. The Baguales material represents one of the earliest occurrences of the genus Nesodon in the fossil record, otherwise restricted to the 'Pinturan' through Colloncuran ages of Argentina and Chile (Ameghino, 1906;Flynn et al, 2002;Croft et al, 2003Croft et al, , 2004Kramarz and Bellosi, 2005;Bond and Kramarz, 2008 Ribeiro and Bond, 1999). Notohippines were abundant towards the end of the Oligocene and beginning of the Miocene in Patagonia, having their last appearance in the fossil record during the 'étage Notohippidien' (Ameghino, 1900(Ameghino, -1902(Ameghino, , 1906Marshall, 1976;Marshall and Pascual, 1977).…”

Section: Vertebrate Fossil Content and Age Of The Santa Cruz Formatiomentioning

confidence: 99%

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Depósitos burdigalianos de la Formación Santa Cruz en Sierra Baguales, Cuenca Austral (Magallanes): Edad, ambiente de deposición y vertebrados fósiles.

Bostelmann

Roux²,

Vasquez

et al. 2013

Andgeo

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Section: An Overview Of the Pansantacrucian Fossil Faunasmentioning

confidence: 99%

Section: An Overview Of the Pansantacrucian Fossil Faunasmentioning

confidence: 99%

Section: An Overview Of the Pansantacrucian Fossil Faunasmentioning

confidence: 99%

Section: Vertebrate Fossil Content and Age Of The Santa Cruz Formatiomentioning

confidence: 99%

See 2 more Smart Citations

Depósitos burdigalianos de la Formación Santa Cruz en Sierra Baguales, Cuenca Austral (Magallanes): Edad, ambiente de deposición y vertebrados fósiles.

Bostelmann

Roux²,

Vasquez

et al. 2013

Andgeo

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“…Posteriormente, Ameghino (1904a) describió Astrapothericulus peninsulatus como proveniente de las "Capas con Notohippus" en Karaiken, Sin embargo, más tarde Ameghino (1906:228) indicó claramente que Astrapothericulus está ausente en las "capas con Notohippus". Estudios bioestratigráficos basados en marsupiales paleoténtidos (Bown & Fleagle, 1993) roedores histricognatos (Kramarz & Bellosi, 2005) y Litopterna indican que sólo las secuencias inferior y media de la Formación Pinturas son portadoras de una asociación de mamíferos distinta y más antigua que las conocidas para la Edad Mamífero Santacrucense, mientras que la secuencia superior contiene en su mayoría taxones típicamente santacrucenses, y sería correlacionable con los niveles más bajos de la Formación Santa Cruz en sus típicas localidades costeras y con los depósitos expuestos en Karaiken portadores de la fauna "Notohippidense". Estas correlaciones están además apoyadas por dataciones 40 Ar/ 39 Ar obtenidas del tope de la secuencia media de la Formación Pinturas y de la base de la Formación Santa Cruz en Monte León y Monte Observación (Fleagle et al, 1995).…”

Section: Distribuciónunclassified

Additions to the knowledge of Astrapothericulus (Mammalia, Astrapotheria): Craniodental anatomy, diversity and distribution

Kramarz¹

2009

RBP

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55ADICIONES AL CONOCIMIENTO DE ASTRAPOTHERICULUS (MAMMALIA, ASTRAPOTHERIA): ANATOMÍA CRÁNEO-DENTARIA, DIVERSIDAD Y DISTRIBUCIÓN RESUMEN -Astrapothericulus Ameghino es el taxón que tipifica las "capas Astrapothericulenses" (Mioceno temprano, Patagonia central). Aunque hasta ahora pobremente conocido, se lo distinguía de otros astrapoterios oligo-miocénicos por su tamaño comparativamente pequeño y por presentar rasgos mandibulares y dentarios menos especializados. Se redescribe y compara aquí la dentadura en base a nuevos y abundantes materiales y se describe el primer resto craneano referible indudablemente a la especie genotípica Astrapothericulus iheringi. Los molariformes se caracterizan por ser de corona más baja que en Astrapotherium magnum (Santacrucense) y con cíngulos basales mucho más gruesos y prominentes, y fléxido labial del p4 ausente o muy superficial, como en Parastrapotherium (Deseadense-Colhuehuapense). Los caninos pueden ser pequeños y radiculados a grandes defensas de base abierta, que aquí se interpreta como variaciones dimórficas. El cráneo y la mandíbula presentan rasgos aparentemente primitivos respecto de Astrapotherium y ParAstrapotherium (e.g. nasales menos retraídos, órbitas más grandes, mandíbula con diastema más corto, sínfisis más estrecha y cóncava). Sin embargo, análisis filogenéticos recientes concluyen que éstas serían reversiones autapomórficas. Astrapothericulus se habría diferenciado a partir de un ancestro de talla mucho mayor estructuralmente próximo a Astrapotherium, y los caracteres mencionados, posiblemente paedomórficos, estarían asociados a la posterior reducción del tamaño corporal como resultado de procesos heterocrónicos. De las especies descriptas, aquí solamente se interpretan como válidas Astrapothericulus iheringi (=Astrapothericulus hebetatum) y Astrapothericulus emarginatus Ameghino (=Astrapothericulus peninsulatus). El género se registra también en capas de edad Colhuehuapense y en los niveles superiores de la Formación Pinturas con fauna típicamente Santacrucense, por lo que su distribución excede cronológicamente las capas portadoras de "fauna Astrapothericulense". Palabras clave:Astrapothericulus, Astrapotheriidae, sistemática, Mioceno temprano, Santa Cruz, Formación Pinturas. ABSTRACT -ADDITIONS TO THE KNOWLEDGE OF ASTRAPOTHERICULUS (MAMMALIA, ASTRAPOTHERIA):CRANIODENTAL ANATOMY, DIVERSITY AND DISTRIBUTION. Astrapothericulus Ameghino is the taxon which typifies the Astrapothericulan beds (Early Miocene, central Patagonia). Although so far it is poorly known, it was distinguished from other Oligo-Miocene astrapotheres by its comparatively smaller size and by having less specialized mandibular and dental features. The dentition is herein redescribed and compared based on new and abundant materials, and the first cranial remain positively referred to the genotypic species Astrapothericulus iheringi is described. The cheek teeth are lower crowned than in Astrapotherium magnum (Santacrucian), the basal cingula are broader and more prominent, and the p4 hypoflex...

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Caviomorphs (Rodentia, Hystricognathi) from Pampa Castillo, Chile: new octodontoid records and biochronological implications

McGrath

Flynn

Croft

et al. 2023

Papers in Palaeontology

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Caviomorph rodents have been diverse and abundant components of South American mammal communities since the late Eocene. We describe herein the octodontoids of Pampa Castillo, a Lower Miocene site in southern Chile (Aysén Region). Six genera and seven species of octodontoids are present, two of which are new: Dudumus berggreni sp. nov. and Caviocricetus guenekko sp. nov. The octodontoids from Pampa Castillo support assignment of this fauna to the Santacrucian South American Land Mammal Age (SALMA), which is consistent with previous studies. We conducted similarity analyses on 11 Early–Middle Miocene Patagonian rodent faunas using hierarchical clustering. Faunas generally fell into the three SALMAs to which they were traditionally assigned: Colhuehuapian, Santacrucian and ‘post‐Santacrucian’. The ‘Pinturan’ is a proposed biochronological interval between the Colhuehuapian and Santacrucian. At the genus level, Pampa Castillo clustered with ‘Pinturan’ faunas, while at the species level it clustered with the ‘typical’ faunas on which the Santacrucian SALMA is based (from outcrops of the Santa Cruz Formation along the Atlantic coast and Río Santa Cruz). The Pampa Castillo rodent fauna resembles both ‘Pinturan’ and ‘typical’ Santacrucian faunas in taxon distributions, reflecting complex temporal and palaeoenvironmental influences. Geochronological data indicate that some ‘Pinturan’ sites overlap temporally with Pampa Castillo and the upper Pinturas Formation, which both clustered with ‘typical’ Santacrucian faunas. These results indicate that the ‘Pinturan’ does not represent a distinct biochronological interval, but that the differences between it and ‘typical’ Santacrucian faunas are attributable to geographic or palaeoenvironmental differences.

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Hystricognath rodents from the Pinturas Formation, Early–Middle Miocene of Patagonia, biostratigraphic and paleoenvironmental implications

Cited by 63 publications

References 30 publications

Depósitos burdigalianos de la Formación Santa Cruz en Sierra Baguales, Cuenca Austral (Magallanes): Edad, ambiente de deposición y vertebrados fósiles.

Depósitos burdigalianos de la Formación Santa Cruz en Sierra Baguales, Cuenca Austral (Magallanes): Edad, ambiente de deposición y vertebrados fósiles.

Additions to the knowledge of Astrapothericulus (Mammalia, Astrapotheria): Craniodental anatomy, diversity and distribution

Caviomorphs (Rodentia, Hystricognathi) from Pampa Castillo, Chile: new octodontoid records and biochronological implications

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