DOCSLIB.ORG

Sauropterygia: Plesiosauria) in Upper Levels of the Dorotea Formation, Late Cretaceous (Maastrichtian), Puerto Natales, Chilean Patagonia

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Sauropterygia: Plesiosauria) in Upper Levels of the Dorotea Formation, Late Cretaceous (Maastrichtian), Puerto Natales, Chilean Patagonia Andean Geology 36 (2): 342-350. July, 2009 Andean Geology formerly Revista Geológica de Chile www.scielo.cl/andgeol.htm PALEONTOLOGICAL NOTE First record of Elasmosaurid Plesiosaurs (Sauropterygia: Plesiosauria) in upper levels of the Dorotea Formation, Late Cretaceous (Maastrichtian), Puerto Natales, Chilean Patagonia Rodrigo A. Otero1, Mario E. Suárez2, Jacobus P. Le Roux3 1 Laboratorio de Zoología de Vertebrados, Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile. Las Palmeras 3425, Santiago, Chile. [email protected] 2 Museo Paleontológico de Caldera. Av. Wheelwright 001, Caldera, Chile. [email protected] 3 Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Casilla 13518, Correo 21, Santiago, Chile. [email protected] ABSTRACT. New remains of plesiosaurs (Diapsida; Sauropterygia) found in a transported block correlated with upper levels of the Dorotea Formation, Late Cretaceous (Maastrichtian) are described herein. They were collected on the southern slopes of Sierra Dorotea located northeast of Puerto Natales (51°41’20,4”S, 72°26’07,4”W), Magallanes Region, Chile. This is the first discovery of the family Elasmosauridae in high latitudes of South America, complementing the previously known paleodistribution of this group in the eastern Pacific Ocean and theAntarctic during the latest Cretaceous. Keywords: Plesiosaurs, Elasmosauridae, Maastrichtian, Dorotea Formation, Magallanes, Chile. RESUMEN. Primer Registro de Plesiosaurios Elasmosáuridos (Sauropterygia: Plesiosauria) en estratos su- periores de la Formación Dorotea, Cretácico Tardío (Maastrichtiano), Puerto Natales, Patagonia Chilena. Se describen nuevos restos de plesiosaurios (Diapsida; Sauropterygia) incluidos en un bloque rodado correlacionado con estratos superiores de la Formación Dorotea (Cretácico Tardío, Maastrichtiano), recolectados en la parte sur de la sierra homónima, ubicada al noreste de Puerto Natales (51°41’20,4”S, 72°26’07,4”W), Región de Magallanes, Chile. Se reconoce por primera vez la presencia de la familia Elasmosauridae en altas latitudes de Sudamérica, complementando así la paleodistribución previamente conocida de este grupo en el margen oriental del Océano Pacífico y de la Antártica durante la última parte del Cretácico Tardío. Palabras claves: Plesiosaurios, Elasmosauridae, Maastrichtiano, Formación Dorotea, Magallanes, Chile. 342-350.indd 342 15/7/09 16:22:13 Otero et al./ Andean Geology 36 (2): 342-350, 2009 343 1. Introduction New Zealand (Cruickshank and Fordyce, 2002), Ja- pan (Ogawa and Nakaya, 1998), California (Welles, Plesiosaurs (Diapsida: Sauropterygia) are 1943), Chile (Suárez and Fritis, 2002), Argentina Mesozoic reptiles adapted to the marine environ- (Cabrera, 1941; Gasparini and Goñi, 1985) and ment, with limbs modified as paddles and hydro- Antarctica (Gasparini et al., 1984; Gasparini and dynamic bodies with elongated necks. Since the Goñi, 1985; Chaterjee and Small, 1989), confirming XIX century, previous occurrences of plesiosaurs that these reptiles had a worldwide distribution and in Chile have been widely reported in the scientific a marked abundance in the Pacific at the end of the literature (Gay, 1848; Philippi, 1887; Steinmann et Cretaceous. al., 1895; Wetzel, 1930; Colbert, 1949; Casamique- The material is hosted at the National Museum la, 1969; Gasparini, 1979). Recent studies on this of Natural History (Museo Nacional de Historia group in this country and Argentina (Suárez, 2000; Natural) of Santiago under the acronym SGO.PV. Gasparini and Salgado, 2000; Suárez and Fritis, The few preserved bone fragments only allow them 2002; Gasparini et al., 2003a) indicate that most to be identified to family level. In addition, the of the regional material belongs to plesiosaurs of considerable hardness of the rock constituting the the Elasmosauridae family, the latter being the best host block hampers preparation of the remains, and represented group of marine reptiles in the Late Cre- due to the lack of more diagnostic characters, such taceous of southern South America and Antarctica preparation would not necessarily facilitate further (Gasparini et al., 2003b). identification. Previous finds of elasmosaurid plesiosaurs in the uppermost Cretaceous of central Chile, came 2. Source of material from the type localities of the Quiriquina Forma- tion near Concepción (Gay, 1848; Steinmann et The Elasmosauridae material for this study was al., 1895; Wetzel, 1930; Gasparini, 1979), and recovered in January 2007 during a field campaign from the localities of Loanco in the Maule Region, of the Paleobotany Group of the Antarctic Ring Topocalma in the O’Higgins Region, and Algarro- Bicentenary Project (Proyecto Bicentenario Ani- bo in the Valparaíso Region (Suárez et al., 2003). llo Antártico, PBCT-ARTG-04), directed by Dr. Only one genus was recognized (Suárez and Fritis, Teresa Torres. The remains were found by the first 2002), Aristonectes Cabrera, previously recovered author on the southern slopes of Sierra Dorotea in Argentina (Cabrera, 1941). Other reports from (51°41’20.4”S, 72°26’07.4”W), approximately 2 Chilean Patagonia include unfigured material from kilometers NE of Puerto Natales, Magallanes Re- the Magallanes Region (Gasparini, 1979). These are gion, Chile (Fig. 1), within a transported block of until now the southernmost records of plesiosaurs calcareous sandstone found at an elevation of 243 in South America. m a.s.l. The block has approximate dimensions of This paper presents new material of Plesiosauria 80x50x40 cm, and a weight of about 350 kg. The from the Late Cretaceous of Patagonia. It constitutes nearest outcrop of calcareous sandstone is in an the first confirmed report of elasmosaurid plesio- inaccessible cliff higher up on the slopes of Sierra saurs in the Maastrichtian of Magallanes, comple- Dorotea. Field observations allow us to interpret the menting previous records from central Chile with stratigraphic provenance of the block to be a horizon an early Maastrichtian age (Stinnesbeck, 1986). In with calcareous lenses and concretionary nodules at addition, it represents the first reliable evidence of an estimated elevation of 300 m a.s.l., located about the Elasmosauridae family in an intermediate region 50 m below the top of the cliff. This lithologic unit between central Chile and Antarctica, confirming is correlated with the upper levels of the Dorotea the presence of the group along the eastern margin Formation (Katz, 1963). of the Pacific Ocean during the Late Cretaceous. Other Cretaceous elasmosaurid plesiosaurs 3. Geologic setting have been reported from the Cenomanian-Turonian of Australia (Kear, 2003) and Venezuela (Colbert, The stratigraphic sequence of the study area is 1949). They are also present in the Santonian of composed, from bottom to top, of the following Japan (Sato et al., 2006) and Canada (Nicholls and units (Fig. 2): Meckert, 2002). The Maastrichtian records include 342-350.indd 343 14/7/09 13:58:58 344 FIRST RECORD O F ELASMOSAURID PLESIOSAURS (SAURO P TERYGIA : PLESIOSAURIA ) IN U pp ER LEVELS O F THE DOROTEA ... FIG. 1. ArcView based map of Puerto Natales-Seno Última Esperanza area, Magallanes, southernmost Chile. The black arrow indicates the location of Sierra Dorotea, about 2 km NE of Puerto Natales, where the material for this study was collected. The other Chilean localities with reports of elasmosaurid plesiosaurs are indicated on the map on the right. Cerro Toro Formation (Cecioni, 1957). Shales, Eocene age based on stratigraphic correlation and conglomerates and sandstones assigned to the microfossils (Malumián and Caramés, 1997). Santonian-Campanian, based on ammonoids and In the present study, the collected material of bivalves (Hoffstetter et al., 1957) and constrained by elasmosaurid plesiosaurs from the upper levels of U-Pb dating on detrital zircons from the underlying the Dorotea Formation (Katz, 1963) was associated Punta Barrosa Formation (Fildani et al., 2003). with a specimen of Gunnarites sp. (study in progress Tres Pasos Formation (Katz, 1963). Turbidites at the Sección de Paleontología y Estratigrafía, and sandstones with conglomerate lenses, assigned Servicio Nacional de Geología y Minería, to the Campanian-early Maastrichtian based on SERNAGEOMIN, Chile), and a specimen of ammonoids and bivalves (Katz, 1963). ‘Pterotrigonia’ cazadoriana (Wilckens) (identified Dorotea Formation (Katz, 1963). Sandstones with by E. Pérez d’A., personal communication, 2008). frequent conglomerate lenses, concretionary levels Additionally, transported material was collected and and claystones. Includes calcareous sandstones identified as monocotiledons (T. Torres, personal with abundant marine invertebrate and fragmentary communication, 2007). The genus Gunnarites, vertebrate fossils (this study). according to Macellari (1985), is typical of the Río Turbio Formation (Feruglio, 1938, sensu middle to late Campanian of Seymour Island, lato; amended by Hünicken, 1955). Mainly Antarctica, but in his opinion it could extend into marine sedimentary rocks of middle Eocene-late the Maastrichtian in Patagonia based on the record 342-350.indd 344 14/7/09 13:58:59 Otero et al./ Andean Geology 36 (2): 342-350, 2009 345 of this genus above beds containing Bolivinoides draco dorreeni Finlay, considered as indicative of the late Maastrichtian (Martínez-Pardo, 1965). However, according to Pérez and Reyes (1978), ‘P.’ cazadoriana could also indicate a late Campanian- Maastrichtian age. The presence
Load more

Recommended publications
  • Programme Monday, March 24
    23rd LAK, 2014, Heidelberg Programme 13 Programme Monday, March 24 INF 252, Hörsäle Chemie 18:00– CONFERENCE DESK OPENING 21:00 18:00– ICEBREAKER PARTY 22:00 * Sponsored by DFG travel grants 14 Programme 23rd LAK, 2014, Heidelberg Tuesday I, March 25 INF 252, Hörsaal Ost INF 252, Hörsaal West 09:30 Welcome Christina Ifrim and Wolfgang Stinnesbeck DAAD-Fördermöglichkeiten für Geowissenschaftler aus/nach Lateinamerika Sybilla Tinnap, DAAD, Bonn Talk 141: Funding Opportunities for Scientific and Technological Cooperation: The Role of the Project Management Agency European and International Cooperation International Bureau of the Bmbf Inge Lamberz de Bayas, Internationales Büro, Bundesministerium für Bildung und Forschung, Bonn International Cooperation in DFG-Programmes – Earth Sciences in Latin America Dietrich Halm, DFG, Bonn 11:00 COFFEE BREAK and POSTER SESSION Session 1: The southernmost dinosurs in Latin Session 2: Water America and their environment Chair: Heinrich Adolf Horn Chair: Marcelo Leppe 11:20 Talk 205: Late Cretaceous Terrestrial Biota from Las Talk 132: Nutrient fluxes in the groundwater affecting Chinas-Cerro Guido Complex, Magallanes Region, the northern mangrove coast of the peninsula Yucatán Southern Chile: A Key Area for the Antarctic-South (México) American Biogeography Lisa Krienen, Thomas Rüde, Eduardo Graniel Castro and Antonio Marcelo Leppe, Wolfgang Stinnesbeck, Eberhard Frey, Héctor Cardona Benavides Mansilla, Manfred Vogt, Edwin Gonzalez, Leslie Manriquez, Katherine Cisternas, Maritza Mihoc and Toshiro Jujihara
    [Show full text]
  • New Late Cretaceous Gastropods from the Pacific Slope of North America
    Watural History Museum y p- CfljlWoh'cN^ Of Los Angeles County iRvartebrate Paleontology J. Paleont., 75(1), 2001, pp. 46-65 | Copyright © 2001, The Paleontological Society 0022-3360/01/0075-46$03.00 NEW LATE CRETACEOUS GASTROPODS FROM THE PACIFIC SLOPE OF NORTH AMERICA RICHARD L. SQUIRES AND LOUELLA R. SAUL Department of Geological Sciences, California State University, Northridge 91330-8266, <[email protected]>, and Invertebrate Paleontology Section, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, < lousaul @ earthlink.net > ABSTRACT—Two new genera and ten new species of shallow-marine, warm-water gastropods are reported from several Upper Creta- ceous formations found between British Columbia and southern California. The buccinid Zaglenum new genus is represented by two new species and the turbinellid Fimbrivasum new genus is represented by three new species. The nododelphinulid Trochacanthus pacificus new species is the first record of this genus in the Western Hemisphere, and the procerthiid Nudivagusl califus new species could be the first record of this genus on the Pacific slope of North America. The xenophorid Xenophora (Endoptygma) hermax new species is only the second known Cretaceous species of this genus on the Pacific slope of North America, and this species establishes that Endoptygma Gabb, 1877, is a valid taxon. The neritid Otostoma sharonae new species is only the fourth known Cretaceous species of this genus on the Pacific slope of North America. The ringiculid Ringicula? (Ringiculopsis?) hesperiae new species is the first Campanian record of this genus on the Pacific slope of North America and the first recognition of this subgenus in this area.
    [Show full text]
  • New Detrital Zircon U/Pb Geochronology of the Cerro Dorotea, Río Turbio, and Río Guillermo Formations, Magallanes Basin
    O EOL GIC G A D D A E D C E I H C I L E O S F u n 2 d 6 la serena octubre 2015 ada en 19 Timing and rates of foreland sedimentation: New detrital zircon U/Pb geochronology of the Cerro Dorotea, Río Turbio, and Río Guillermo formations, Magallanes basin Julie C. Fosdick1*, J. Enrique Bostelmann2, Joel Leonard1, Raúl Ugalde3, José Luis Oyarzún4, and Miguel Griffin5 1: Department of Geological Sciences, Indiana University, 1001 Tenth Street, Bloomington, Indiana, 47405, USA. 2: Red Paleontológica U-Chile, Laboratorio de Ontogenia y Filogenia, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago, Chile. 3: PEDECIBA Geociencias, Facultad de Ciencias, Universidad de la República, Iguá 4225, Montevideo, Uruguay. 4: Parque Geo-paleontológico La Cumbre-Baguales, Ruta 9 km 284, Magallanes, Chile. 5: CONICET—División PaleoZoología Invertebrados, Museo de La Plata. Paseo del Bosque s/n, La Plata, Argentina. * email: [email protected] Abstract. We report new detrital zircon U/Pb signals (timing, tempo, magnitude) of tectonics, climate, geochronology from the Cenozoic Magallanes foreland and eustasy in the stratigraphic record. For instance, basin (near 51 °S) in both Argentina and Chile, that sheds enhanced tectonism in foreland basin settings can cause light on sedimentary provenance and improved timing of crustal load-driven subsidence and basin deepening. sedimentation for the Cerro Dorotea, Río Turbio, and Río Globally, the growth and ablation of continental ice sheets Guillermo formations. Using youngest detrital age regulates sea level and global climate, and precipitation populations to constrain maximum depositional age (MDA), and temperature gradients influence erosion rates, we provide the first radiometric age confirmation of vegetation cover, and the distribution of deformation.
    [Show full text]
  • Lower Jaws of Two Species of Menuites (Pachydiscidae, Ammonoidea) from the Middle Campanian (Upper Cretaceous) in the Soya Area, Northern Hokkaido, Japan
    Bull. Natl. Mus. Nat. Sci., Ser. C, 45, pp. 19–27, December 27, 2019 Lower jaws of two species of Menuites (Pachydiscidae, Ammonoidea) from the middle Campanian (Upper Cretaceous) in the Soya area, northern Hokkaido, Japan Kazushige Tanabe1* and Yasunari Shigeta2 1 University Museum, The University of Tokyo, Hongo 7–3–1, Bunkyo Ward, Tokyo 113–0033, Japan 2 Department of Geology and Paleontology, National Museum of Nature and Science, 4–1–1 Amakubo, Tsukuba, Ibaraki 305–0005, Japan * Author for correspondence: [email protected] Abstract The lower jaws of two pachydiscid ammonites Menuites soyaensis (Matsumoto and Miyau- chi) and Menuites sp. are described on the basis of two specimens from the middle Campanian (Upper Cretaceous) in the Soya area of northern Hokkaido, Japan. They are preserved in situ in the body cham- ber and characterized by a widely open outer lamella with a nearly flat rostral portion. The outer lamella consists of an inner “chitinous” layer sculptured by a median furrow in the anterior to mid-portions and an outer calcareous layer with prismatic microstructure. The lower jaw features of the two Menuites spe- cies are shared by other species of the Pachydiscidae described in previous works, indicating that they are diagnostic characters of this family. In view of the shovel-like shape without a pointed rostrum, the lower jaws of the two Menuites species were likely used as a scoop to feed on microorganisms. Key words: pachydiscid ammonites, middle Campanian, lower jaw, Soya area (Hokkaido) found together retaining their original life orienta- Introduction tion. Based on such well-preserved specimens and Both modern and extinct cephalopod mollusks their comparison with the jaws of modern cephalo- possess a well-developed jaw apparatus that con- pods, previous authors (e.g.
    [Show full text]
  • Paleontological Discoveries in the Chorrillo Formation (Upper Campanian-Lower Maastrichtian, Upper Cretaceous), Santa Cruz Province, Patagonia, Argentina
    Rev. Mus. Argentino Cienc. Nat., n.s. 21(2): 217-293, 2019 ISSN 1514-5158 (impresa) ISSN 1853-0400 (en línea) Paleontological discoveries in the Chorrillo Formation (upper Campanian-lower Maastrichtian, Upper Cretaceous), Santa Cruz Province, Patagonia, Argentina Fernando. E. NOVAS1,2, Federico. L. AGNOLIN1,2,3, Sebastián ROZADILLA1,2, Alexis M. ARANCIAGA-ROLANDO1,2, Federico BRISSON-EGLI1,2, Matias J. MOTTA1,2, Mauricio CERRONI1,2, Martín D. EZCURRA2,5, Agustín G. MARTINELLI2,5, Julia S. D´ANGELO1,2, Gerardo ALVAREZ-HERRERA1, Adriel R. GENTIL1,2, Sergio BOGAN3, Nicolás R. CHIMENTO1,2, Jordi A. GARCÍA-MARSÀ1,2, Gastón LO COCO1,2, Sergio E. MIQUEL2,4, Fátima F. BRITO4, Ezequiel I. VERA2,6, 7, Valeria S. PEREZ LOINAZE2,6 , Mariela S. FERNÁNDEZ8 & Leonardo SALGADO2,9 1 Laboratorio de Anatomía Comparada y Evolución de los Vertebrados. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Avenida Ángel Gallardo 470, Buenos Aires C1405DJR, Argentina - fernovas@yahoo. com.ar. 2 Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina. 3 Fundación de Historia Natural “Felix de Azara”, Universidad Maimonides, Hidalgo 775, C1405BDB Buenos Aires, Argentina. 4 Laboratorio de Malacología terrestre. División Invertebrados Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Avenida Ángel Gallardo 470, Buenos Aires C1405DJR, Argentina. 5 Sección Paleontología de Vertebrados. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Avenida Ángel Gallardo 470, Buenos Aires C1405DJR, Argentina. 6 División Paleobotánica. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Avenida Ángel Gallardo 470, Buenos Aires C1405DJR, Argentina. 7 Área de Paleontología. Departamento de Geología, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria (C1428EGA) Buenos Aires, Argentina. 8 Instituto de Investigaciones en Biodiversidad y Medioambiente (CONICET-INIBIOMA), Quintral 1250, 8400 San Carlos de Bariloche, Río Negro, Argentina.
    [Show full text]
  • Importance of Predecessor Basin History on the Sedimentary Fill of A
    EAGE Basin Research (2010) 22, 640–658, doi: 10.1111/j.1365-2117.2009.00443.x Importance of predecessor basin history on the sedimentary fill of a retroarc foreland basin: provenance analysis of the Cretaceous Magallanes basin, Chile (50^521S) B. W. Romans,n A. Fildani,w S. A. Graham,n S. M. Hubbardz and J. A. Covaultn nDepartment of Geological & Environmental Sciences, Stanford University, Stanford, CA, USA wChevron EnergyTechnology Company, Clastic Stratigraphy R&D, San Ramon, CA, USA zDepartment of Geoscience, University of Calgary,Calgary,AB, Canada ABSTRACT An integrated provenance analysis of the Upper Cretaceous Magallanes retroarc foreland basin of southern Chile (501300^521S) provides new constraints on source area evolution, regional patterns of sediment dispersal and depositional age. Over 450 new single-grain detrital-zircon U-Pb ages, which are integrated with sandstone petrographic and mudstone geochemical data, provide a comprehensive detrital record of the northern Magallanes foreland basin- ¢lling succession (44000- m-thick). Prominent peaks in detrital-zircon age distribution among the Punta Barrosa, CerroToro, TresPasos andDoroteaFormations indicate thatthe incorporation and exhumation ofUpperJurassic igneous rocks (ca.147^155Ma) into the Andean fold-thrust belt was established in the Santonian (ca. 85 Ma) andwas a signi¢cant source of detritus to the basin by the Maastrichtian (ca.70 Ma). Sandstone compositional trends indicate an increase in volcanic and volcaniclastic grains upward through the basin ¢ll corroborating the interpretation of an unroo¢ng sequence. Detrital-zircon ages indicate that the Magallanes foredeep received young arc-derived detritus throughout its ca. 20 m.y.¢lling history,constraining the timing of basin- ¢lling phases previously based only on biostratigraphy.
    [Show full text]
  • The Gaudryceratid Ammonoids from the Upper Cretaceous of the James Ross Basin, Antarctica
    The gaudryceratid ammonoids from the Upper Cretaceous of the James Ross Basin, Antarctica MARÍA E. RAFFI, EDUARDO B. OLIVERO, and FLORENCIA N. MILANESE Raffi, M.E., Olivero, E.B., and Milanese, F.N. 2019. The gaudryceratid ammonoids from the Upper Cretaceous of the James Ross Basin, Antarctica. Acta Palaeontologica Polonica 64 (3): 523–542. We describe new material of the subfamily Gaudryceratinae in Antarctica, including five new species: Gaudryceras submurdochi Raffi and Olivero sp. nov., Anagaudryceras calabozoi Raffi and Olivero sp. nov., Anagaudryceras subcom- pressum Raffi and Olivero sp. nov., Anagaudryceras sanctuarium Raffi and Olivero sp. nov., and Zelandites pujatoi Raffi and Olivero sp. nov., recorded in Santonian to Maastrichtian deposits of the James Ross Basin. The early to mid-Campan- ian A. calabozoi Raffi and Olivero sp. nov. exhibits a clear dimorphism, expressed by marked differences in the ornament of the adult body chamber. Contrary to the scarcity of representative members of the subfamily Gaudryceratinae in the Upper Cretaceous of other localities in the Southern Hemisphere, the Antarctic record reveals high abundance and di- versity of 15 species and three genera in total. This highly diversified record of gaudryceratins is only comparable with the Santonian–Maastrichtian Gaudryceratinae of Hokkaido, Japan and Sakhalin, Russia, which yields a large number of species of Anagaudryceras, Gaudryceras, and Zelandites. The reasons for a similar, highly diversified record of the Gaudryceratinae in these distant and geographically nearly antipodal regions are not clear, but we argue that they prob- ably reflect a similar paleoecological control. Key words: Ammonoidea, Phylloceratida, Gaudryceratinae, Lytoceratoidea, Cretaceous, Antarctica. María E.
    [Show full text]
  • From the Late Cretaceous of the Magallanes Basin, Chilean Patagonia
    Andean Geology ISSN: 0718-7092 [email protected] Servicio Nacional de Geología y Minería Chile Otero, Rodrigo A.; Soto-Acuña, Sergio; Salazar S., Christian; Oyarzún, José Luis New elasmosaurids (Sauropterygia, Plesiosauria) from the Late Cretaceous of the Magallanes Basin, Chilean Patagonia: Evidence of a faunal turnover during the Maastrichtian along the Weddellian Biogeographic Province Andean Geology, vol. 42, núm. 2, mayo, 2015, pp. 237-267 Servicio Nacional de Geología y Minería Santiago, Chile Available in: http://www.redalyc.org/articulo.oa?id=173938242005 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative Andean Geology 42 (2): 237-267. May, 2015 Andean Geology doi: 10.5027/andgeoV42n1-a05 www.andeangeology.cl New elasmosaurids (Sauropterygia, Plesiosauria) from the Late Cretaceous of the Magallanes Basin, Chilean Patagonia: Evidence of a faunal turnover during the Maastrichtian along the Weddellian Biogeographic Province * Rodrigo A. Otero1, Sergio Soto-Acuña1, 2, Christian Salazar S.2, José Luis Oyarzún3 1 Red Paleontológica U-Chile, Laboratorio de Ontogenia y Filogenia, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Santiago, Chile. [email protected], [email protected] 2 Área Paleontología, Museo Nacional de Historia Natural, Casilla 787, Santiago, Chile. [email protected] 3 Miraflores 863, Puerto Natales, Chile. [email protected] * Corresponding author: [email protected] ABSTRACT. Several Upper Cretaceous plesiosaur specimens recovered from southernmost Chile are described here. These were collected from upper levels of the Dorotea Formation exposed on three different localities (Sierra Baguales, Cerro Castillo, and Dumestre).
    [Show full text]
  • (Campanian and Maestrichtian) Ammonites from Southern Alaska
    Upper Cretaceous (Campanian and Maestrichtian) Ammonites From Southern Alaska GEOLOGICAL SURVEY PI SSIONAL PAPER 432 Upper Cretaceous (Campanian and Maestrichtian) Ammonites From Southern Alaska By DAVID L. JONES GEOLOGICAL SURVEY PROFESSIONAL PAPER 432 UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1963 UNITED STATES DEPARTMENT OF THE INTERIOR STEWART L. UDALL, Secretary GEOLOGICAL SURVEY Thomas B. Nolan, Director The U.S. Geological Survey Library has cataloged this publication as follows: Jones, David Lawrence, 1930- Upper Cretaceous (Campanian and Maestrichtian) am­ monites from southern Alaska. Washington, U.S. Govt. Print. Off., 1963. iv, 53 p. illus., maps, diagrs., tables. 29 cm. (U.S. Geological Survey. Professional paper 432) Part of illustrative matter folded in pocket. 1. Amnionoidea. 2. Paleontology-Cretaceous. 3. Paleontology- Alaska. I. Title. (Series) Bibliography: p. 47-^9. For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402 CONTENTS Page Abstract-__________________________ 1 Comparison with other areas Continued Introduction. ______________________ 1 Vancouver Island, British Columbia.. 13 Stratigraphic summary ______________ 2 California. ______________--_____--- 14 Matanuska Valley-Nelchina area. 2 Western interior of North America. __ 14 Chignik Bay area._____._-._____ 6 Gulf coast area___________-_-_--_-- 15 Herendeen Bay area____________ 8 Madagascar. ______________________ 15 Cape Douglas area______________ 9 Antarctica ________________________ 15 Deposition and ecologic conditions___. 11 Geographic distribution ________________ 16 Age and correlation ________________ 12 Systematic descriptions.________________ 22 Comparison with other areas _ _______ 13 Selected references._________--_---__-__ 47 Japan _________________________ 13 Index._____-______-_----_-------_---- 51 ILLUSTRATIONS [Plates 1-5 in pocket; 6-41 follow index] PLATES 1-3.
    [Show full text]
  • A Comparison of the Ammonite Faunas of the Antarctic Peninsula and Magallanes Basin
    J. geol. Soc. London, Vol. 139, 1982, pp. 763-770, 1 fig, 1 table. Printed in Northern Ireland A comparison of the ammonite faunas of the Antarctic Peninsula and Magallanes Basin M. R. A. Thomson SUMMARY: Ammonite-bearingJurassic and Cretaceous sedimentary successions are well developed in the Antarctic Peninsula and the Magallanes Basin of Patagonia. Faunas of middle Jurassic-late Cretaceous age are present in Antarctica but those of Patagonia range no earlier than late Jurassic. Although the late Jurassic perisphinctid-dominated faunas of the Antarctic Peninsulashow wide-ranging Gondwana affinities, it is not yet possible to effect a close comparison with faunas of similar age in Patagonia because of the latter's poor preservation and our scant knowledge of them. In both regions the Neocomian is not well represented in the ammonite record, although uninterrupted sedimentary successions appear to be present. Lack of correspondence between the Aptian and Albian faunas of Alexander I. and Patagonia may be due to major differences in palaeogeographical setting. Cenomanian-Coniacian ammonite faunas are known only from Patagonia, although bivalve faunas indicate that rocks of this age are present in Antarctica. Kossmaticeratid faunas mark the late Cretaceous in both regions. In Antarcticathese have been classified as Campanian, whereas in Patagonia it is generally accepted, perhaps incorrectly, that these also range into the Maestrichtian. Fossiliferous Jurassic and Cretaceous marine rocks are rize first those of the Antarctic Peninsula and then to well developedin theAntarctic Peninsula, Scotia compare them with those of Patagonia. Comparisons Ridge andPatagonia (Fig. 1A).In Antarcticathese between Antarctic ammonite faunas and other Gond- rocks are distributed along the western and eastern wana areas wereoutlined by Thomson (1981a), and margins of theAntarctic Peninsula, formerly the the faunas of the marginal basin were discussed in magmatic arc from which the sediments were derived.
    [Show full text]
  • Programm Und Kurzfassungen – Program and Abstracts
    1 Zitteliana An International Journal of Palaeontology and Geobiology Series B/Reihe B Abhandlungen der Bayerischen Staatssammlung für Paläontologie und Geologie 29 Paläontologie im Blickpunkt 80. Jahrestagung der Paläontologischen Gesellschaft 5. – 8. Oktober 2010 in München Programm und Kurzfassungen – Program and Abstracts München 2010 Zitteliana B 29 118 Seiten München, 1.10.2010 ISSN 1612-4138 2 Editors-in-Chief/Herausgeber: Gert Wörheide, Michael Krings Mitherausgeberinnen dieses Bandes: Bettina Reichenbacher, Nora Dotzler Production and Layout/Bildbearbeitung und Layout: Martine Focke, Lydia Geissler Bayerische Staatssammlung für Paläontologie und Geologie Editorial Board A. Altenbach, München B.J. Axsmith, Mobile, AL F.T. Fürsich, Erlangen K. Heißig, München H. Kerp, Münster J. Kriwet, Stuttgart J.H. Lipps, Berkeley, CA T. Litt, Bonn A. Nützel, München O.W.M. Rauhut, München B. Reichenbacher, München J.W. Schopf, Los Angeles, CA G. Schweigert, Stuttgart F. Steininger, Eggenburg Bayerische Staatssammlung für Paläontologie und Geologie Richard-Wagner-Str. 10, D-80333 München, Deutschland http://www.palmuc.de email: [email protected] Für den Inhalt der Arbeiten sind die Autoren allein verantwortlich. Authors are solely responsible for the contents of their articles. Copyright © 2010 Bayerische Staassammlung für Paläontologie und Geologie, München Die in der Zitteliana veröffentlichten Arbeiten sind urheberrechtlich geschützt. Nachdruck, Vervielfältigungen auf photomechanischem, elektronischem oder anderem Wege sowie
    [Show full text]
  • Download Pdf File
    Vol. 45 - N. 2 SUPPLEMENT Bollettino di Geofisica teorica ed applicata An International Journal of Earth Sciences Guest Editors: J. Carcione, F. Donda, E. Lodolo International Symposium on the Geology and Geophysics of the Southernmost Andes, the Scotia Arc and the Antarctic Peninsula Extended Abstracts of the GeoSur2004 International Symposium 22-23 November, 2004 Buenos Aires, Argentina Istituto Nazionale di Oceanografia ISSN 0006-6729 e di Geofisica Sperimentale Responsibility for all statements made in B.G.T.A. lies with the authors Cover design and typesetting: Nino Bon – OGS Printing: Centro Box SRL – Buenos Aires, Argentina Authorized by the Tribunale di Trieste, n. 242, September 17, 1960 INTERNATIONAL SYMPOSIUM International Symposium on the Geology and Geophysics of the Southernmost Andes, the Scotia Arc and the Antarctic Peninsula 22-23 November 2004 Buenos Aires, Argentina EXTENDED ABSTRACTS GEOSUR2004 22-23 NOVEMBER 2004 – BUENOS AIRES ORGANIZERS ISTITUTO NAZIONALE DI OCEANOGRAFIA E DI GEOFISICA SPERIMENTALE - OGS, TRIESTE, ITALY INSTITUTO DE GEOFÍSICA “DANIEL A. VALENCIO”, DEPARTAMENTO DE GEOLOGÍA, UNIVERSIDAD DE BUENOS AIRES, ARGENTINA SPONSORS ITALIAN EMBASSY IN ARGENTINA PROGRAMMA NAZIONALE DI RICERCHE IN ANTARTIDE (P.N.R.A.) EAGE-SEG Italian Section 4 GEOSUR2004 22-23 NOVEMBER 2004 – BUENOS AIRES SCIENTIFIC COMMITTEE G. BRANCOLINI - OGS, Trieste A. CAMERLENGHI - OGS, Trieste M. CANALS - University of Barcelona J.M. CARCIONE - OGS, Trieste A.H. COMÍNGUEZ - CONICET, University of La Plata I.W.D. DALZIEL - University of Texas at Austin E. DOMACK - Hamilton College, New York F. HERVÉ - University of Santiago R. LARTER - British Antarctic Survey S. MARENSSI - IAA, Buenos Aires G. PANZA - University of Trieste C.
    [Show full text]