New Early Jurassic gastropods from west-central Patagonia, Argentina

“…Bivalves, gastropods, cephalopods, brachiopods and corals were reported by these authors from several localities in the area, including Lomas Occidentales, Cerro La Trampa, Piedra Shotle and Lomas de Betancourt, which have yielded the most important Jurassic fossiliferous beds from the marine Mulanguiñeu Formation (Chubut Province). Another important marine locality was reported at the Early Jurassic of the Osta Arena Formation from the Pampa de Agnia region (central Chubut Province), known as Puesto Currumil (Ferrari, 2009(Ferrari, , 2012(Ferrari, , 2013Pagani et al, 2012). Preliminary biostratigraphic analyses carried out in the southern and west-central Chubut Province (Pagani et al, 2012;Ferrari, 2013Ferrari, , 2014a indicated a late Pliensbachian-early Toarcian age for these deposits.…”

Section: Introductionmentioning

confidence: 99%

“…Preliminary biostratigraphic analyses carried out in the southern and west-central Chubut Province (Pagani et al, 2012;Ferrari, 2013Ferrari, , 2014a indicated a late Pliensbachian-early Toarcian age for these deposits. Moreover, Damborenea and Ferrari (2008), Ferrari (2009Ferrari ( , 2011aFerrari ( , b, 2012Ferrari ( , 2013Ferrari ( , 2014a, Ferrari et al (2014) and Pagani et al (2011Pagani et al ( , 2012 recently carried out new studies on the taxonomic composition of the faunas in the Early Jurassic of south-western and central Chubut Province, including the investigation of new fossil localities and the collection of Early Jurassic material.…”

Section: Introductionmentioning

confidence: 99%

Una nueva localidad marina de edad jurásica temprana en la cuenca sudoccidental del Chubut, Argentina.

Ferrari

Bessone

2015

Andgeo

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ABSTRACT.A shallow marine invertebrate association is reported from a new Early Jurassic locality namely La Casilda, which is situated in the southwestern region of the Chubut Basin (Patagonia, Argentina). The marine deposits of La Casilda are located in the Río Genoa valley and bear a diverse invertebrate fauna including bivalves, gastropods, brachiopods, echinoderms and corals. A preliminary taxonomic analysis of the invertebrate fauna suggests that La Casilda deposits belong to the Mulanguiñeu Formation of late Pliensbachian-early Toarcian age, and may be coeval with those from the marine localities previously sampled in other regions of the Río Genoa valley. The preliminary results of a biodiversity analysis displayed that La Casilda is one of the most diverse localities at the Chubut Basin and could be assigned to the biofacies at the mixed siliciclastic-carbonate ramp proposed for the marine Early Jurassic at the Andean Basin of northern Chile. The evolution of the marine transgression during the early Pliensbachian-early Toarcian is also interpreted here in a time scale based on ammonite faunas, giving a preliminary temporal reconstruction of the entire Chubut Basin. Keywords: Invertebrates, La Casilda, Mulanguiñeu Formation, Chubut Basin, Argentina. RESUMEN. Una nueva localidad marina de edad jurásica temprana en la cuenca sudoccidental del Chubut, Argentina. Una asociación de invertebrados marinos de aguas someras se registró en una nueva localidad perteneciente al Jurásico temprano denominada La Casilda, la que se sitúa en la región suroeste de la cuenca del Chubut (Patagonia, Argentina). Los depósitos marinos correspondientes a La Casilda se encuentran en el valle del Río Genoa y comprenden una diversa fauna de invertebrados, incluyendo bivalvos, gastrópodos, braquiópodos, equinodermos y corales. Un análisis taxonómico preliminar de dicha fauna sugiere que los depósitos de La Casilda pertenecen a la Formación Mulanguiñeu, cuya edad es Pliensbachiano tardío-Toarciano temprano, y a su vez podrían ser coetáneos con los depósitos marinos de otras localidades muestreados previamente en el valle del Río Genoa. Resultados preliminares de un análisis de biodiversidad muestran que La Casilda es una de las localidades más diversas en la cuenca del Chubut y podría ajustarse a las biofacies correspondientes a la rampa mixta siliciclástica-carbonatada propuesta para la Cuenca Andina del Jurásico temprano marino del norte de Chile. La evolución de la transgresión marina que tuvo lugar durante el Pliensbachiano temprano-Toarciano temprano también se interpreta aquí en una escala de tiempo sobre la base de la fauna de ammonites, dando una reconstrucción temporal preliminar de toda la cuenca del Chubut.Palabras clave : Invertebrados, La Casilda, Formación Mulanguiñeu, Cuenca del Chubut, Argentina. 350 A new eArly JurAssic mArine locAlity from southwestern chubut bAsin, ArgentinA.

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“…Several Argentinean Early Jurassic marine gastropods have been described by Ferrari (2009Ferrari ( , 2011Ferrari ( , 2012Ferrari ( , 2013Ferrari ( , 2014aFerrari ( , 2014b and Ferrari et al (2014) from the Chubut Province. Up to date, 13 gastropod families from the Early Jurassic (late Pliensbachianearly Toarcian) marine deposits of the Mulanguiñeu and Osta Arena formations (Chubut Province), representing 20 genera, 2 subgenera and at least 30 species are reported.…”

Section: Introductionmentioning

confidence: 99%

“…Damborenea et al (1975) preliminarily reported 15 gastropod species from the late Pliensbachian beds at Piedra Pintada (southern Neuquén), and Ferrari et al (in press) contributed to the paleontological knowledge of the family Trochotomidae in the Early Jurassic of the Neuquén basin. Recently, Ferrari (2011Ferrari ( , 2012Ferrari ( , 2013Ferrari ( , 2014aFerrari ( , 2014b Ferrari et al (2014) has described in detail and referred many gastropod species from Argentina to the genera Chartronella, Calliotropis, Ambercyclus, Colpomphalus, Cryptaenia, Guidonia, Hamusina, Jurassiphorus, Procerithium, Cryptaulax, Oonia, Striactaeonina, Actaeonina. Most of the species described thus far from Argentina show close taxonomic affinities to the Late Triassic gastropod faunas reported by Haas (1953) from the Pucará Group of Central Perú.…”

Section: Introductionmentioning

confidence: 99%

Revisión sistemática de los gastrópodos marinos del Triásico superior de Perú Central: consideraciones sobre el recambio faunístico en límite Triásico tardío/Jurásico temprano.

Ferrari

2015

Andgeo

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ABSTRACT. The Late Triassic/Early Jurassic boundary is marked by a mass extinction event which had an important effect on the marine benthic communities on a global scale. In the Andean region of South America, however, the impact of this phenomenon on the earliest Mesozoic marine invertebrate associations has not been evaluated thus far. The present contribution is a systematic revision of the Late Triassic marine benthic gastropod faunas from the Pucará Group of Central Perú, giving a detailed characterization of 18 species and an updated systematic assigment of representatives of the genera Chartroniella, Phymatifer, Ptychomphalina, Paracerithium, Rhabdocolpus and Omphaloptycha. This research includes a comparison of the Peruvian fauna with their related counterparts from the Early Jurassic of Argentina and the Early/Middle Jurassic of New Zealand. This approach attempts to interpret the Late Triassic/Early Jurassic faunal turnover after the end Triassic crisis and establishes a palaeobiogeographical scheme for the gastropod faunal exchange in the Southern Hemisphere across the palaeo-Pacific seaway during the Late Triassic/Early Jurassic. RESUMEN. Revisión sistemática de los gastrópodos marinos del Triásico superior de Perú Central: consideraciones sobre el recambio faunístico en límite Triásico tardío/Jurásico temprano. El límite Triásico tardío/Jurásico temprano está marcado por un evento de extinción en masa que tuvo un efecto importante en las comunidades marinas bentónicas a escala global. Sin embargo, el impacto de dicho fenómeno sobre las asociaciones de invertebrados marinos del Mesozoico temprano en la región andina de América del Sur no ha sido evaluado hasta el momento. La presente contribución es una revisión sistemática de la fauna de gastrópodos marinos bentónicos procedentes del grupo Pucará en Perú Central, en la que se da una caracterización morfológica detallada de 18 especies y una asignación sistemática actualizada de representantes de los géneros Chartroniella, Phymatifer, Ptychomphalina, Paracerithium, Rhabdocolpus y Omphaloptycha. Este trabajo incluye una comparación de las faunas peruanas con faunas similares correspondientes al Jurásico temprano de Argentina y al Jurásico temprano/medio de Nueva Zelanda. Asimismo, el presente enfoque apunta a interpretar, el recambio faunístico que tuvo lugar en el límite Triásico tardío/Jurásico temprano después de la gran crisis de finales del Triásico, y a establecer un esquema paleobiogeográfico para los gastrópodos en el Hemisferio Sur a lo largo del corredor Paleo-Pacífico.

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New Early Jurassic gastropods from west-central Patagonia, Argentina

Abstract: A new gastropod fauna is reported from Chubut province of west−central Patagonia. Members of Trochoidea, Pseudomelanoidea, Campaniloidea, and

Cited by 12 publications

References 9 publications

Early Jurassic Caenogastropoda and Architectibranchia from the Neuquén Basin, Argentina

Early Jurassic Caenogastropoda and Architectibranchia from the Neuquén Basin, Argentina

Una nueva localidad marina de edad jurásica temprana en la cuenca sudoccidental del Chubut, Argentina.

Revisión sistemática de los gastrópodos marinos del Triásico superior de Perú Central: consideraciones sobre el recambio faunístico en límite Triásico tardío/Jurásico temprano.

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