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Tithonian-Berriasian Ammonite Fauna of Arroyo Cieneguita

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Tithonian-Berriasian Ammonite Fauna of Arroyo Cieneguita Boletín del Instituto de Fisiografía y Geología 79-81, 2011. 21 THE TITHONIAN-BERRIASIAN AMMONITE FAUNA AND STRATIGRAPHY OF ARROYO CIENEGUITA, NEUQUÉN-MENDOZA BASIN, ARGENTINA Horacio PARENT, Armin SCHERZINGER & Günter SCHWEIGERT Boletín Parent H., Scherzinger A. & Schweigert G., 2011. The Tithonian-Berriasian ammonite fauna and stratigraphy of del Instituto de Arroyo Cieneguita, Neuquén-Mendoza Basin, Argentina. Boletín del Instituto de Fisiografía y Geología 79-81: Fisiografía y Geología 21-94. Rosario, 01-07-2011. ISSN 1666-115X. Abstract.- In this paper we present the results of the revision of the ammonite fauna and the stratigraphy of the Tithonian- Berriasian succession of Arroyo Cieneguita (Mendoza, Argentina), based on new material recently collected and the collections studied by Steuer, Gerth and Krantz. The studied succession belongs to the Vaca Muerta Formation which overlies the Tordillo Formation in concordance. The lower part of the succession consists of marls and shales, being rich in ammonites, bivalves and gastropods; the middle (shales) and upper (limestones and marls) parts contain almost exclusively ammonites. The majority of the species described by Steuer and a part of those studied by Gerth and Krantz have been revised and several type specimens designated and refigured. Ammonites of the Haploceratoidea have been only recorded in the interval Picunleufuense - lower Internispinosum zones including the genera Pseudolissoceras, Cieneguiticeras, Pasottia, ?Parastreblites, ?Uhligites and ?Semiformiceras. The Catutosphinctes and Choicensisphinctes genera are recorded from the Picunleufuense Zone (lowermost Tithonian) up to the Koeneni Zone (uppermost Tithonian). Two new genera of the Lithacoceratinae (family Ataxiocertidae) are introduced: Krantziceras n. gen. and Platydiscus n. gen. Remaining Ataxioceratid genera recorded are: Lithacoceras, Mazatepites and probably Malagasites (a doubtful specimen). The Berriasellinae are represented by Parodontoceras, Substeueroceras, Blanfordiceras and Chigaroceras (a single specimen), and the Spiticeratinae by Spiticeras and Groebericeras. The Himalayitidae include species of Steueria n. gen., Micracanthoceras, Windhauseniceras, Corongoceras and Himalayites (a single specimen). The Aspidoceratinae are well represented by Aspidoceras, Toulisphinctes, Pseudhimalayites and Physodoceras, although as typical in the basin, the material is scarce. The chronostratigraphic classification and time-correlation of the studied succession are based, as usual, on the biostratigraphy of its ammonites. In some levels occur associations which enable the definition of ammonite (bio-)horizons, useful biostratigraphic units consisting of beds with a characteristic fauna. Eight new ammonite horizons are introduced, from below: cf. erinoides hz. (Zitteli Z.), falculatum hz. (Proximus Z.), vetustum hz., bardense hz. (Alternans Z.), striolatus hz. (Koeneni Z.), compressum hz., noduliferum hz. (Noduliferum Z.) and transgrediens hz. (Damesi Z.). The succession of these horizons and other ones already defined in previous papers, are associated to the Andean chronostratigraphic scale which is then used for fine time-correlation between sections of several localities of the Neuquén-Mendoza Basin where a number of them could be recognized by means of their characteristic ammonite assemblages. The vetustum hz., Alternans Zone, upper Tithonian is recognized in Madagascar and probably in parts of Antarctica. Key-words: Tithonian-Berriasian; Arroyo Cieneguita; Neuquén-Mendoza Basin; Argentina; Ammonite-horizon; Time- correlation. Resúmen.- Fauna de amonites y estratigrafía del Tithoniano-Berriasiano de Arroyo Cieneguita, Cuenca Neuquén- Mendoza, Argentina. En este informe se presentan los resultados de la revisión de la fauna de amonites y la estratigrafía de la sucesión del intervalo Tithoniano-Berriasiano de Arrroyo Cieneguita (Mendoza, Argentina), basado en material nuevo colectado recientemente y el material estudiado originalmente por Steuer, Gerth y Krantz. La sucesión estudiada corresponde a la Formación Vaca Muerta que suprayace en concordancia a la Formación Tordillo. La parte baja de la sucesión consiste en margas y lutitas, con abundantes amonites, bivalvos y gastrópodos; las partes media (lutitas) y superior (calizas y margas) contienen casi exclusivamente amonites. La mayor parte de las especies descriptas por Steuer y una parte de aquellas descriptas por Gerth y Krantz han sido revisadas y algunos especímenes tipo designados y refigurados. Amonites de la superfamilia Haploceratoidea fueron registrados únicamente en los niveles del intervalo de las Zonas Picunleufuense (Tithoniano inferior basal) - Internispinosum inferior incluyendo representantes de los géneros Pseudolissoceras, Cieneguiticeras, Pasottia, ?Parastreblites, ?Uhligites y ?Semiformiceras. Los linajes que representan los géneros Catutosphinctes y Choicensisphinctes han sido registrados, mas o menos saltuariamente, en todo el Tithoniano, desde la base (Zona Picunleufuense) hasta su parte más alta (Zona Koeneni). Se proponen dos nuevos géneros incluídos en la subfamilia Lithacoceratinae (familia Ataxioceratidae): Krantziceras n. gen. y Platydiscus n. gen. Los restantes Ataxioceratidae registrados son: Lithacoceras, Mazatepites y probablemente Malagasites (un único especímen dudoso). Los Berriasellinae están representados por Parodontoceras, Substeueroceras, Blanfordiceras y Chigaroceras (un único especímen). Los Spiticeratinae están representados por Spiticeras y Groebericeras. Los Himalayitidae incluyen especies asignadas al nuevo género Steueria n. gen., así como a Micracanthoceras, Windhauseniceras, Corongoceras e Himalayites (un único especímen). Los Aspidoceratinae se encuentran bien representados por los géneros Aspidoceras, Toulisphinctes, Pseudhimalayites y Physodoceras aunque, como es común en la cuenca, el material es relativamente escaso. La clasificación cronoestratigráfica y la correlación temporal de los niveles de la sección estudiada se han desarrollado, como es habitual, a partir de la bioestratigrafía de los amonites descriptos. En algunos niveles, de la sección estudiada y de otras de la cuenca, ocurren asociaciones que permiten la definición de bio-horizontes de amonites, que constituyen útiles unidades bioestratigráficas consistentes en estratos con una fauna característica diferenciable de las inmediatamente subyacentes y suprayacentes. Ocho nuevos de estos horizontes de amonites son introducidos para el intervalo Tithoniano- Berriasiano de la cuenca. De abajo hacia arriba ellos son: hz. cf. erinoides (Z. Zitteli), hz. falculatum (Z. Proximus), hz. vetustum, hz. bardense (Z. Alternans), hz. striolatus (Z. Koeneni), hz. compressum, hz. noduliferum (Z. Noduliferum) y hz. transgrediens (Z. Damesi). La sucesión de estos horizontes y otros ya definidos previamente, en trabajos anteriores son asociados a la escala cronoestratigráfica andina que es entonces utilizada para correlación temporal de detalle entre secciones de numerosas localidades de la Cuenca Neuquén-Mendoza donde ellos son reconocidos por medio de los conjuntos de sus Bol. Inst. Fis. Geol. 79-81: 21-94. Copia Impresa / Printed Copy [€ 40+5] Rosario - Argentina. http://www.fceia.unr.edu.ar/fisiografia 22 Parent, Scherzinger & Schweigert - Tithonian-Berriasian ammonites of Arroyo Cieneguita, Argentina amonites característicos. El hz. vetustum de la Zona Alternans, Tithoniano superior, puede reconocerse en Magadascar y muy probablemente en partes de Antártida. Palabras clave: Tithoniano-Berriasiano; Arroyo Cieneguita; Cuenca Neuquén-Mendoza; Argentina; Horizonte de amonites; Correlación temporal. Adresses of the authors: H. Parent [[email protected]]: Laboratorio de Paleontología, IFG, Facultad de Ingeniería, Universidad Nacional de Rosario, Pellegrini 250, 2000 Rosario, Argentina. A. Scherzinger [[email protected]]: Lämmerhalde 3, 71735 Eberdingen, Germany. G. Schweigert [[email protected]]: Staatliches Museum für Naturkunde, Rosenstein 1, 70191 Stuttgart, Germany. Received: 06/12/2010; accepted: 07/03/2011. Editors: E. P. Peralta and A.F. Greco. CONTENTS INTRODUCTION ............................................... 23 BIOSTRATIGRAHY ............................................. 82 STRATIGRAPHY ................................................. 24 Biostratigraphy of the studied section .............. 82 Geological setting ..................................................... 24 Regional biostratigraphic time-correlation ............... 84 Description of the section ................................. 24 Time-correlation with the Primary Standard ........ 84 Taphonomic and biostratonomic features ................ 24 Acknowledgements ....................................................... 86 SYSTEMATIC PALAEONTOLOGY ......................... 26 REFERENCES ....................................................... 86 Conventions ......................................................... 26 Delimitation of species ........................................ 26 Appendix 1. Measurements of type and selected specimens ... 90 Compositon of the fauna........................................ 26 Appendix 2. Additional photographic refiguration of specimens figured or Perisphinctoidea Steinmann, 1890 ................... 26 described by Steuer (1897, transl. 1921) and Weaver (1931) ... 91 Ataxioceratidae Buckman, 1921 ................... 26 Lithacoceratinae Zeiss, 1968 ........................ 26 Lithacoceras Hyatt, 1900 .......................
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