Blanca A. Toro

Consejo Nacional de Investigaciones Científicas y Técnicas

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Edsel D. Brussa

Consejo Nacional de Investigaciones Científicas y Técnicas

Jörg Maletz

Freie Universität Berlin

Bárbara Vento

Centro Científico Tecnológico - Mendoza

Beatriz G. Waisfeld

Universidad Nacional de Córdoba

Nexxys C. Herrera Sánchez

Research Center on Earth Sciences

Juan L. Benedetto

Universidad Nacional de Córdoba

Yuandong Zhang

Nanjing Institute of Geology and Paleontology

Susana Heredia

National University of San Juan

Claudia V. Rubinstein

Centro Científico Tecnológico - Mendoza

G. Susana de la Puente

National University of Comahue

Cooperative Institutions

Consejo Nacional de Investigaciones Científicas y Técnicas

Universidad Nacional de Córdoba

Research Center on Earth Sciences

La Trobe University

Centro Científico Tecnológico - Tucumán

National University of San Juan

Sapienza University of Rome

Universidad Nacional Tecnológica

Centro Científico Tecnológico - Mendoza

National University of La Rioja

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LA FAUNA DE GRAPTOLITOS DE LA FORMACIÓN ACOITE, EN EL BORDE OCCIDENTAL DE LA CORDILLERA ORIENTAL ARGENTINA. ANÁLISIS BIOESTRATIGRÁFICO

Ameghiniana (2014)

Blanca A. Toro

biostratigraphic analysis of the graptolite fauna collected from the Acoite Formation, in the westem side of the Argentine Cordillera Oriental is presented. The fossils come from eight stratigraphic sections, located in the Tumbaya, Humahuaca and Cochinoca departments, Jujuy Province. These sections were measured from south to north in Agua Blanca, Los Colorados, Chamarra, Rio Trancas, Los Perros, Rio Cajas, Agua Chica and Lumara creeks. A biozonation scheme has been established as a result of the vertical range of fortyfive species of graptoloids. This suggests a basal Arenigian-middle Arenigian age for the studied unit. The Tetragraptus phyllograptoides Zone (Earliest Arenigian, corresponding to La 3 of the Australian zonation) is developed in the basallevels of the Acoite Formation and is characterized, apart from the index fossil, for the following species: Didymograptus (s. l.) rigoletto MaJetz et al., D. (s. l.) cf. D. rigoletto, Baltograptus geometricus (Tornquist), D. (s. l.) uniformis Elles and Wood, D. (s. l.) cf. D. demissus Tornquist, Clonograptus multiplex (Nicholson) and Tetragraptus approximatus approximatus Nicholson. The Tetragraptus akzharensis Zone (Early Arenigian, Be 1 and part of Be 2 of Australia), is represented by diagnostic species, such as: Tetragraptus akzharensis Tzaj., Didymograptus (Expansograptus) constrictus (J. Hall), D. (s. l.) holmi Tornquist, D. (s. l.) protobalticus Monsen, Corymbograptus v-fractus (Salter) and Baltograptus vacillans (Tullberg); whereas other taxa persist from the lower biozone. The Baltograptus deflexus Zone (Early Arenigian, equivalent to pan of Be 2-Be 4) is the most extense and contains: Baltograptus deflexus (ElIes and Wood), B. cf. B. deflexus, B. vacillans, B. kurcki Tornquist, B. turgidus (Lee), B. kunmingensis Ni, Pendeograptus fruticosus (1. Hall), Dichograptus octobrachiatus (J. Hall), Didyniograptus (Expansograptus) similis (J. Hall), D. (E.) suecicus (Tullberg), D. (s. l.) ba/ticus (Tullberg), D. (s. l.) uniformis, D. (s. l.) /1O/lI/i, D. (s. l.) simulans Elles and Wood, D. (s. l.) dilatans T.S. Hall, D. (s. l.) sinensis Lee and Chen, D. (s. l.) cf. D. aureus T.S. Hall, D. (s. l.) cf. D. asperus Harris and Thomas, Tetragraptus reclinatus abbreviatus Boucek, T. reclinatus cf. reclinatus ElIes and Wood, T. (s. l.) quadribrachiatus (J. Hall), Acrograptus filiformis (Tullberg), A. cf. A. pusillus (Tullberg) and Kinnegraptus sp. Finally, in the uppermost Didymograptellus bifidus Zone (Middle Arenigian, equivalent to Ch I-Ch 2), Baltograptus minutus (Tornquist) and Phyllograptus anna J. Hall appear together with the index fossil; whereas Didymograptus (s. l.) simulans, B. kurcki and B. deflexus persist from the previous zone. The recognized biozones allow the correlation of the Acoite Formation with other outcrops from the Lower Ordovician of northwestern Argentine. Moreover, a world-wide correlation scheme is proposed.

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Las familias Glossograptidae, Dicranograptidae y Orthograptidae (Graptolithina) en el Ordovícico Superior de la Formación Empozada, provincia de Mendoza, Argentina

Ameghiniana (2004)

Edsel D. Brussa Blanca A. Toro

Resumen. Se presenta la revision taxonomica de una parte de la coleccion de graptolitos efectuada por Rusconi depositada en el Museo de Ciencias Naturales y Antropologicas “Juan Cornelio Moyano” de Mendoza, Argentina. Los especimenes de glossograptidos, dicranograptidos, leptograptidos y ortograptidos incluidos en este trabajo fueron coleccionados por Carlos Rusconi durante las decadas de 1940 y 1950 en la Formacion Empozada, en el area de San Isidro, Precordillera mendocina. Este material ha sido comparado con especimenes de la misma unidad coleccionados por los autores. Los holotipos y paratipos de doce de las especies descriptas por Rusconi fueron examinados y asignados a Glossograptus ciliatus Emmons, Cryptograptus tricornis (Carruthers), Dicranograptus ramosus cf. spinifer Elles y Wood, D. nicholsoni nicholsoni Hopkinson. Ademas, se describen Glossograptus fimbriatus (Hopkinson), Leptograptus cf. L. validus Elles y Wood y Orthograptus ex gr. calcaratus (Lapworth). Abstract. THE FAMILIES GLOSSOGRAPTIDAE, ORTHOGRAPTIDAE AND DICRANOGRAPTIDAE (GRAPTOLITHINA) FROM THE LATEORDOVICIAN OF THE EMPOZADA FORMATION, MENDOZA PROVINCE, ARGENTINA. This paper deals with the taxonomic revision of some graptolite groups from the Rusconi collection housed in the “Juan Cornelio Moyano” Natural and Anthropological Sciences Museum of Mendoza, Argentina. Glossograptid, dicranograptid, leptograptid and orthograptid specimens included in this paper were collected by Carlos Rusconi during the 1940´s and 1950´s from the Empozada Formation, located in the San Isidro area, Mendoza Precordillera. This material was compared with specimens from the same unit collected by the authors. The holotypes and paratypes of twelve nominal species described by Rusconi were examined and reassigned to Glossograptus ciliatus Emmons, Cryptograptus tricornis (Carruthers), Dicranograptus ramosus cf. spinifer Elles and Wood, D. nicholsoni nicholsoni Hopkinson. Moreover, Glossograptus fimbriatus (Hopkinson), Leptograptus cf. L. validus Elles and Wood and Orthograptus ex gr. calcaratus (Lapworth) are described.

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Stratigraphical distribution of the Ordovician graptolite Azygograptus Nicholson & Lapworth in the Central Andean Basin (northwestern Argentina and southern Bolivia)

Comptes Rendus Palevol (2019)

Blanca A. Toro Nexxys C. Herrera Sánchez

Biozone

Conodont

Pelite

10.1016/j.crpv.2019.06.002

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Citations (13)

Correlations between metapelitic zones and graptolite reflectance in ordovician successions from northwestern Argentina depicting a complex postdepositional history

International Journal of Coal Geology (2025)

Nexxys C. Herrera Sánchez Margarita Do Campo Blanca A. Toro Fernando Nieto

10.1016/j.coal.2025.104723

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Paleoecological and paleobiogeographic considerations of Ordovician graptolites from the Cordillera Oriental, Jujuy Province, Argentina

Historical Biology (2013)

Bárbara Vento Blanca A. Toro Jörg Maletz

AbstractWe analyse new paleoecological data from South American graptolite records to understand the patterns that influence the space-tempo distribution of the group. A cluster analysis including taxa from the Baltograptus cf. B. deflexus and Didymograptellus bifidus Zones is carried out to evaluate the paleogeographic relationships between north-western Argentina and the other regions in the world. Three different biofacies were recognised in the Acoite Formation. The first biofacies takes place in the lower part of the unit, corresponding to pelitic levels (Tetragraptus phyllograptoides and Tetragraptus akzharensis Zones), and it is represented by pandemic forms. The other two biofacies belong to the endemic or neritic shallow water environments, and develop in deposits corresponding to the middle part of the Acoite Formation (bottom of the Baltograptus cf. B. deflexus Zone) in the Sierra de Aguilar, and in the upper half of the unit exposed in the Los Colorados area (D. bifidus Zone), respectively. The statistical analysis highlight the paleobiogeographic relationship between north-western Argentina and south-western China during the middle-upper Floian (Baltograptus cf. B. deflexus and D. bifidus Zones), and it supports the hypothesis that during the Early Ordovician north-western Argentina was located in the middle to high latitudes, included in the cold water faunal realm.Keywords:: Ordoviciangraptolitesbiofaciespaleoenvironmentalpaleobiogeography Additional informationFundingThis work was supported by CONICET-PIP 11220110101111, and it constitutes a contribution to 691 IGCP-UNESCO Project.

10.1080/08912963.2013.845881

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Citations (7)

Treatise Online no. 108: Part V, Second Revision, Chapter 20: Suborder Dichograptina: Introduction, morphology, and systematic descriptions

Treatise Online (2018)

Jörg Maletz Blanca A. Toro Yuandong Zhang A.H.M. Vandenberg

Multiramous to two-stiped graptoloids with biradiate isograptid proximal development and maeandrograptid proximal symmetr y; colony shape scandent to reclined, horizontal, and pendent; prosicula small, with widening and much larger metasicula; thecae simple, widening tubes with or without rutellum

Morphology

10.17161/to.v0i0.7736

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Citations (2)

Hallazgo del primer eurypterido silurico de Argentina

Edsel D. Brussa Blanca A. Toro

Primer (cosmetics)

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Nuevas observaciones sistemáticas de los graptolitos de la Formación Empozada, “Colección Rusconi”, Ordovícico Superior de la Precordillera de Mendoza, Argentina

Ameghiniana (2007)

Blanca A. Toro Edsel D. Brussa

Resumen. Se analizaron los holotipos, paratipos y ejemplares mejor conservados de veinte taxones de graptolitos creados por Rusconi, que se encuentran depositados en el Museo de Ciencias Naturales y Antropologicas Juan Cornelio Moyano de Mendoza. Los fosiles provienen de los depositos de la Formacion Empozada, expuesta en el area de San Isidro, Precordillera mendocina y fueron comparados con especimenes coleccionados por los autores en dicha unidad. Se brinda un comentario de los taxones que resultan invalidados en este trabajo: Desmograptus australis (Rusconi), Tetragraptusbueyensis (Rusconi), Dichograptusquebradensis (Rusconi), Pterograptus longissimus (Rusconi), Cryptograptus crassispinus (Rusconi), Mendograptus inversus (Rusconi), Monograptus bayensis (Rusconi), Glyptograptus cuyanensis (Rusconi), Glyptograptus cuyunchensis (Rusconi) y Janograptus simplicidentatus (Rusconi), como asi tambien de aquellos cuya reasignacion resulta dudosa: Janograptus alfaensis (Rusconi), Janograptus australis (Rusconi) y Janograptus bueyensis (Rusconi). Se realizo ademas la descripcion de los taxones reasignados como: Thamnograptus sp., Climacograptustubuliferus Lapworth, Orthoretiolites aff. hami Whittington, Hallograptus sp. y Plegmatograptus sp., y se identifican y describen por primera vez para la Formacion Empozada: Corynoides sp. y Dicellograptus cf. minor Toghill. Por ultimo, se discute la nueva informacion acerca de la composicion de las asociaciones de graptolitos presentes en los niveles estudiados y sus implicaciones bioestratigraficas. Abstract.NEW SYSTEMATIC IN SIGHTS ABOUT THE GRAPTOLITES OF THE “RUSCONI COLLECTION” FROM THE LATE ORDOVICIAN EMPOZADA FORMATION, PRECORDILLERA OF MENDOZA, ARGENTINA. The holotypes, paratypes and the best preserved material of twenty graptolite taxa proposed by Rusconi, and deposited in the Juan Cornelio Moyano Natural and Anthropological Sciences Museum of Mendoza were reviewed. The fossils, which were collected from sedimentary deposits of the Empozada Formation that crop out in the San Isidro area, located in the Precordillera close to Mendoza city, were compared with the specimens collected by the authors in the same unit. This paper deals with the reasons why the following taxa are invalid: Desmograptus australis (Rusconi), Tetragraptus bueyensis (Rusconi), Dichograptus quebradensis (Rusconi), Pterograptus longissimus (Rusconi), Cryptograptus crassispinus (Rusconi), Mendograptus inversus (Rusconi), Monograptus bayensis (Rusconi), Glyptograptus cuyanensis (Rusconi), Glyptograptus cuyunchensis (Rusconi) and Janograptus simplicidentatus (Rusconi); in addition, reasons for the doubtful classification of the following taxa are discussed: Janograptus alfaensis (Rusconi), Janograptusaustralis (Rusconi) and Janograptus bueyensis (Rusconi). Moreover, the descriptions of reassigned taxa such as: Thamnograptus sp., Climacograptustubuliferus Lapworth, Orthoretiolites aff. hamiWhittington, Hallograptus sp. and Plegmatograptus sp. are given. Corynoides sp. and Dicellograptus cf. minor Toghill are reported and described for the first time for the Empozada Formation. Finally, new information about the recognized graptolite assemblages and their biostratigraphic implications is also discussed.

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Graptofauna arenigiana de la Quebrada del Río Cajas (Formación Acoite), Provincia de Jujuy, Argentina

Ameghiniana (1993)

Blanca A. Toro

ARENIGIAN GRAPTOLITES FROM THE RIO CAJAS SECTION (ACOITE FORMATION), JUJUY PROVINCE, ARGENTINA. A graptolite association from Quebrada del Rio Cajas is described. The occurrence of Didymograptus (Corymbograptus) balticus together with Acrograptus filiformis in lower levels of the Acoite Formation indicates an Early Arenig age for these horizons. This association is described for the first time in Argentina and corresponds to the D. (Corymbograptus) balticus Biozone from Sweden, equivalent to the lower part of the D. (Coryrnbograptus) deflexus Subzone of the British zonation.

Biozone

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Citations (13)

Lower ordovician palynomorphs from the Acoite formation, Northwestern Argentina

Palynology (1992)

Eduardo G. Ottone Blanca A. Toro Beatriz G. Waisfeld

Abstract Thirty‐six taxa of moderately abundant and relatively well‐preserved acritarchs, algae, chitinozoans, scolecodonts and graptolite siculae from the Acoite Formation, northwestern Argentina, are described. Two new acritarch species, Ammonidium ballistum Ottone and Baltisphaerosum peniguelii Ottone, together with one new combination, Adorfia hoffmanensis (Cramer et al. 1974) Ottone, are proposed. Two distinct palynomorph assemblages have been differentiated throughout the unit: (1) a Lower Acoite Palynological Assemblage, early Arenigian in age; and (2) an Upper Acoite Palynological Assemblage, referred to the middle Arenigian. Both palynological assemblages appear to be related to the Mediterranean or Perigondwanian Paleoprovince and thus represent a high latitudinal plankton assemblage.

Acritarch

Assemblage (archaeology)

10.1080/01916122.1992.9989409

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Citations (43)