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(Mioceno) Del Valle De Santa María (Catamarca Y Tucumán), Argentina

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(Mioceno) Del Valle De Santa María (Catamarca Y Tucumán), Argentina AMEGHINIANA (Rev. Asoc. Paleontol. Argent.) - 40 (2): 205-216. Buenos Aires, 30-06-2003 ISSN0002-7014 Moluscos dulceacuícolas de las Formaciones San José y Chiquimil (Mioceno) del Valle de Santa María (Catamarca y Tucumán), Argentina Lourdes S. MORTON1y Rafael HERBST2 Abstract.NEWMOLLUSCSFROMTHEMIOCENESANJOSEANDCHIQUIMILFORMATIONS, SANTAMARIAVALLEY, CATAMARCAANDTUCUMANPROVINCES, ARGENTINA.Eight species of molluscs are described from the San José and Chiquimil Formations (Upper Middle to Upper Miocene), of which four gastropods are new: BiomphalariasanjosensisMorton n. sp. Littoridina bossiiMorton n. sp., L. gavriloffiMorton n. sp., Potamolithus bertelsaeMorton n. sp.; Bulimulussp. and Lymnaeaviatrix(d’Orbigny) are also present. Two bivalves are also new: NeocorbiculaherbstiMorton n. sp. and N. anzoteguiaeMorton n. sp. They represent additions to the previously described assemblage from these units. This is a fresh- to brackish water fau- na and a marine paleoenvironment is definitively excluded. Resumen.Se describen ocho especies de moluscos de las Formaciones San José y Chiquimil del Mioceno Medio tardío al Mioceno Superior, entre los cuales hay cuatro especies nuevas de gastrópodos: Biomphalaria sanjosenesisMorton n. sp., Littoridina bossiiMorton n. sp., L. gavriloffiMorton n. sp., Potamolithus bertelsaeMorton n. sp., además de Bulimulussp. y Lymnaea viatrix(d’Orbigny). Dos especies de bivalvos también son nuevas: Neocorbicula herbstiMorton n. sp. y N. anzoteguiaeMorton n. sp. Todas ellas representan adiciones a las asociaciones conocidas de estas unidades. Esta es una fauna de aguas dulces a salobres y se descarta definitivamente el ambiente marino. Key words.Gastropods. Bivalves. Miocene. Paleoenvironments. Tucumán. Catamarca. Argentina. Palabras clave. Gastrópodos. Bivalvos. Mioceno. Paleoambientes. Tucumán. Catamarca. Argentina. Introducción número de taxones. Cabe señalar que en esta oportu- nidad no se ha intentado un análisis bioestratigráfico La presente es una contribución de carácter ta- detallado, ya que se estima que el inventario faunís- xonómico destinada a complementar y ampliar el co- tico no está completo aún. Por otra parte, de acuerdo nocimiento de la fauna de moluscos de las con nuestros conocimientos es posible aseverar que Formaciones San José y Chiquimil, previamente des- los mismos moluscos aparecen en distintos niveles crito por Morton (1984 y 1986). Por ello, salvo una rá- de la columna sedimentaria y por ello es probable pida mención general de los aspectos geológicos de que tengan más valor como indicadores ambientales estas unidades, no entraremos en una discusión de- que cronológicos. En el cuadro 1 se listan los taxones tallada sobre los aspectos estratigráficos, cronológi- comunes a ambas formaciones. cos y paleoambientales, que han sido tratados con al- guna amplitud en la literatura (Bossi y Palma, 1982; Gavriloff y Bossi, 1992; Bossi y Gavriloff, 1998). Materiales Algunos de estos aspectos todavía son objeto de con- El material fosilífero analizado está representado troversia entre los autores que se ocupan del tema. por moldes, algunos silicificados, y más frecuente- Los presentes autores estiman que es de interés e im- mente por impresiones, en general en buenas condi- portancia dar a conocer con detalle el elenco faunís- ciones de preservación, lo que permitió adecuadas tico de estas unidades, ya que a medida que se identificaciones. En muchos casos las valvas están efectúan nuevas recolecciones se va acrecentando el desarticuladas pero en algunos niveles se encuentran 1Facultad de Ciencias Exactas y Naturales y Agrimensura, articuladas. Salvo una elemental limpieza, no requi- Universidad Nacional del Nordeste. Centro de Ecología Aplicada rieron ninguna técnica de preparación. Los materia- del Litoral-Consejo Nacional de Investigaciones Científicas y les fueron colectados por los autores en diversas Técnicas, Casilla de Correo 291, 3400 Corrientes, Argentina. campañas entre 1996 y 2000. Están incorporados a las [email protected] 2Instituto Superior de Geología- Consejo Nacional de colecciones de la Facultad de Ciencias Exactas y Investigaciones Científicas y Técnicas, Las Piedras 201 7º/B, 4000 Naturales y Agrimensura de la Universidad Nacio- Tucumán, Argentina. [email protected] nal del Nordeste, bajo la sigla CTES-PZ. ©Asociación Paleontológica Argentina AMGHB2-0002-7014/03$00.00+.50 206 L.S. Morton y R. Herbst Figura 1. Esquema de afloramientos de la Formación San José en el valle de Santa María (provincias de Catamarca y Tucumán)./ Outcrops of San José Formation in the Santa María valley (Catamarca and Tucumán provinces):1. Julipao, 2. *Ojo de Agua, 3. Tiopunco - *NE de Tiopunco, 4. Morro de las Brujas - km 104 - km 107 (sobre ruta 307), 5. Río Quenquiada, 6. Río Salinas, 7. Camino al Dique, 8. *La Aguadita, 9. Zig-Zag Norte - Lomas Amarillas - Pista de aviación - Rio Seco, 10. Río Ormachea, 11. Quebrada de Jujuil, 12. San José - Lomas Finca Mena. Las lo- calidades 2, 3 y 8 corresponden también a afloramientos de la Formación Chiquimil. / Localities 2, 3 and 8 also correspond to Chiquimil Formation. AMEGHINIANA40 (2), 2003 Moluscos dulceacuícolas del Mioceno del noroeste argentino 207 Geología Especie tipo.Bulimus guadalupensisBruguière, 1789. Thiele (1931) y Zilch (1960) usaron el nombre de Bulimulacea para La Formación San José constituye la unidad basal la Superfamilia, pero luego Baker (1956) y posteriormente Nuttall del Grupo Santa María, tal como fuera propuesto por (1990) señalaron que Orthalicacea (Orthalicidae) tiene prioridad, Galván y Ruiz Huidobro (1965) y redefinido por Bossi siendo ello reconocido por diversos autores, incluso Parodiz y Palma (1982). Su distribución areal, aunque algo dis- (1969), que usó ambos nombres. La distribución del género Bulimulus(Orthalicidae: Bulimulinae) se extiende en toda la región continua, abarca una angosta franja desde aproxima- Neotropical (Breure, 1979a; 1979b), abarcando América del Sur e damente la latitud de San José (Catamarca) en el sur incluso América Central y la parte sur de Estados Unidos. (figura 1) hasta las cercanías del cerro Paranilla (Salta) en el norte, a lo largo de unos 120 kilómetros. Se com- Bulimulussp. pone de una serie de areniscas finas, limolitas, niveles Figura 2.A areno-calcáreos y en menor proporción algunos con- Descripción.Conchilla bastante alargada. Espira glomerados; sus colores dominantes son los amarillos bien desarrollada elevada-cónica, con 6 vueltas sua- y verdosos que los hacen muy notorios y fáciles de vemente convexas, algo oblicuas y más anchas que identificar en el campo. Su espesor en la localidad tipo altas. Última vuelta incompleta, fracturada por lo (frente a San José, figura 1) es del orden de los 250 m, que no se observa la abertura. Suturas bien marca- pero hacia al norte aumenta sostenidamente hasta al- das, profundas, con un ángulo de inclinación de 42º. canzar cerca de los 1000 m en la quebrada Agua Negra Ángulo espiral de 33º. (Bossi y Palma, 1982). Aunque a la fecha existe dispa- Dimensiones.Longitud: 2,4 mm; longitud espira: 1,6 ridad de opiniones sobre las relaciones estratigráficas, mm se acepta que esta unidad se asienta mediando suave Material.Formación San José: PZ-CTES 5609, Río discordancia sobre la Formación Saladillo, cuya edad Ormachea; PZ-CTES 3541 San José, Catamarca. no está bien precisada, pero cuya sección o miembro Observaciones.Por los caracteres morfológicos ob- superior correspondería al Mioceno Inferior (Powell y servados, estos fósiles pertenecen al género González, 1997) o quizás hasta el Eoceno?- Oligoceno Bulimulus. Se ha podido observar parte de la conchi- (Bossi y Gavriloff, 1998). Se le sobrepone (paraconcor- lla pero la última vuelta así como el ápice se hallan dantemente?) la Formación Las Arcas, de colores roji- rotos, por lo que no se pudo establecer mejor la afini- zos y carácter netamente fluvial, y por encima de ésta, dad con alguna especie. la Formación Chiquimil. Esta última unidad estra- Orden BASOMMATOPHORAKeferstein, 1864 tigráfica ha sido tradicionalmente dividida en dos, Familia PLANORBIDAERafinesque, 1815 Chiquimil A y B, con características litológicas y am- bientales diferentes. El Miembro inferior (B), del que Genero BiomphalariaPreston, 1910 provienen los invertebrados acuáticos, está constitui- Especie tipo.Biomphalaria smithiPreston, 1910. do por areniscas finas, limosas y arcilitas, de colores Biomphalaria sanjosensisMorton nov. sp. gris y amarillento verdoso (Bossi y Gavriloff, 1998). Figuras 2.B-D Los aspectos paleoambientales de ambas unidades serán analizadas más abajo. Diagnosis.Conchilla pequeña, planoespiral, 31/2 Sin entrar a discutir aquí la edad definitiva de to- vueltas; levemente deprimida en el lado derecho, la- da esta secuencia admitiremos, por el momento, que do izquierdo umbilicado. Primeras vueltas cortas, de la porción inferior el Grupo Santa María (Forma- crecimiento rápido y la última más desarrollada y re- ciones San José a Chiquimil) se extiende entre el dondeada. Mioceno Medio y el Superior. Es indudable que la Descripción.Conchilla baja discoidal-planiespiral; la historia definitiva y la edad de estas Formaciones espira casi horizontal, planiforme, con una leve de- aún requiere de detallados estudios para los cuales el presión en el lado derecho; 31/2vueltas redondeadas, conocimiento de las faunas puede contribuir positi- convexas en ambos lados, primeras vueltas angostas, vamente. apretadas y la última ensanchada y redondeada; lado izquierdo umbilicado, bien marcado, cóncavo, vuel- tas
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