DOCSLIB.ORG

Brazilian Theropods from the Equatorial Atlantic Margin: B-Ehavior and Environmental Setting

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Brazilian Theropods from the Equatorial Atlantic Margin: B-Ehavior and Environmental Setting GAIA N' 15, LlSBOAlLI SBON, DEZEMBRO/DECEMBER 1998, pp. 369-378 (ISSN: 0871-5424) BRAZILIAN THEROPODS FROM THE EQUATORIAL ATLANTIC MARGIN: B-EHAVIOR AND ENVIRONMENTAL SETTING Ismar de Souza CARVALHO Departamento de Geologia, Instituto de Geociencias, UFRJ. Cidade Universitaria, Ilha do Fundao, 21949-900, RIO DE JANEIRO, RJ . BRASIL E-mail: [email protected] Elizabete PEoRAo PETROBRAS/CENPES/DIVEXISEBIPE. Quadra 7, Predio 20, Cidade Universi!,;ria, 21949-900, RIO DE JANEIRO, RJ. BRASIL E-mail: [email protected] ABSTRACT: The Sao Luis Basin, located on the equatorial coastal region of Brazil, shows a di­ versified Upper Cretaceous biota, The commonest vertebrate fossils and ichnofossils be­ long to a theropod dinosaurian fauna that is widespread over that geographic area,The theropod footprints and associated bone fragments are found in fine-grained quartzose sandstones, deposited in nearshore environments submitted to tidal currents. They are found in six localities of Sao Luis and Alcantara counties: Ponta da Guia, Ponta do Farol, Praia do Boqueirao, IIha do Medo, Praia da Baronesa and IIha do Cajual. There are trails and isolated footprints attributed to large and small theropods and ornithischians. The best pre­ served footprints are found at Ponta da Guia and Praia da Baronesa.The ichnocoenoses of Ponta da Guia and Praia da Baronesa, are discussed from the view point of dinosaurian so­ cial behavior. A gregarious behavior was observed among the Ponta da Guia theropods - a rare herding structure in this dinosaur group. The randomly oriented trackways and isolated footprints at Praia da Baronesa were interpreted as the record of a "foraging area" for thero­ pods. There they would search for fishes, turtles and other organisms, found in small la­ goons and channels of a tidal flat environment. The footprint-bearing strata of Sao Luis Basin are considered to compose a megatracksite alongside the early equatorial Atlantic ocean. Its geological context - a low-gradient coastal plain - allowed the establishment of specific dinosaur groups. There was a probable ecologic "segregation" of large-sized and small-sized theropods, in this way giving rise to a regional paleobiogeographic and pa­ laeoecologic distribution pattern of the theropod communities. R ESUMO: A bacia de Sao Luis, localizada na regiao equatorial do Brasil, apresenta uma biota do Cretacico superior bastante diversificada. Trata-se de uma bacia tipo rifte cuja origem se relaciona com a abertura da margem atlantica no intervalo geocronologico compreendido entre 0 Aptiano e 0 Cenomaniano. Os fosseis e icnofosseis de vertebrados mais comuns nesta bacia pertencem a uma fauna de dinossaurios teropodomorfos, a qual esta distribui­ da numa am pia area geografica. As pegadas e fragmentos osseos de teropodes sao encon­ trados em arenitos quartzosos finos, depositados em ambientes litorais sujeitos a correntes de mare. Ocorrem em seis localidades dos municipios de Sao Luis e Alcantara (estado do Maranhao): Ponta da Guia, Ponta do Farol, Praia do Boqueirao, IIha do Medo, Praia da Baronesa e IIha do Cajual. As pistas e pegadas isoladas foram atribuidas a peque­ nos e grandes teropodes, alem de ornitisquios, sendo que as pegadas melhor preservadas sao oriundas da Ponta da Guia e Praia da Baronesa. Com base nas icnocenoses da Ponta da Guia e Praia da Baronesa, e discutido 0 comportamento social destes dinossaurios. Foi ob­ servado 0 habito gregario entre os teropodes da Ponta da Guia - uma estrutura organizacio­ nal rara neste grupo de dinossaurios. A orienta~ao aleatoria e as varias pegadas isoladas da Praia da Baronesa foram interpretadas como 0 registo de uma area de alimenta~ao. Os di- 369 artigos/papers I.S. CARVALHO & E. PEDRAO nossaurios desta regiao poderiam procurar peixes, tartarugas e outros organismos em pe­ quenas lagoas e em canais da planicie de mare durante periodos de mare baixa, representando assim uma "area de alimenta!;ao" para teropodes de tamanho medio e pe­ queno. As camadas com pegadas fosseis na bacia de Sao Luis sao consideradas como par­ te de urn "megatracksite", localizado ao longo da linha de costa durante a fase inicial do oceano Atlantico equatorial. 0 contexte geologico deste "megatracksite" - uma planicie costeira de baixo gradiente - possibilitou 0 estabelecimento de grupos especificos de di­ nossauros. Existiu uma provavel segrega!;ao ecologica dos teropodes de grande e de pe­ queno tamanho, havendo assim uma distribui!;ao paleobiogeografica e paleoecologica das comunidades de teropodes. INTRODUCTION theropod paleobiology, although uncommon, was already recorded by LEONARDI (1984, 1989) and During the opening of the Atlantic margin in the THULBORN & WADE (1979, 1984) from tracks of the equatorial region of Brazil (Aptian-Cenomanian Toro-Toro ichnofauna (EI Molino Formation, Maas­ time). tectonic action gave rise to numerous rift ba­ trichtian - Bolivia) and the Queensland ichnofauna sins. At the same time, structural reactivation of the (Winton Formation, Albian-Cenomanian - Austra­ Precambrian basement in the interior of the conti­ lia). nent, allowed the subdivision of formerly wide sedi­ mentary areas into smaller new basins. The Sao This study presents a global view of theropod Luis basin (Fig. 1), located on the northern region of ichnofossil and fossil data from the equatorial Sao Maranhao State (Brazil), had its origin in this con­ Luis Basin. In addition, it discusses the results of text. This is the only basin in the equatorial Brazilian palynological analises that further contribute to a margin whose Cretaceous outcrops display sedi­ better understanding of the environment where this ments of this geological phase. In other equatorial dinosaurian fauna lived and respective age. basins, coeval deposits have submerged in the con­ tinental platform. GEOLOGY OF THE SAO Luis BASIN Tectonic settings at the end of the Early Creta­ The Sao Luis Basin is a Cretaceous rift basin of ceous, originated by the South America - African 18,000 km', whose evolution is related to the origin drifting gave rise to this basin. Intense faulting ofthe Brazilian equatorial margin. According to Ros­ through the present-day northern coast of Mara­ SETTI (1996a), the sedimentary framework of this nhao State originated thick sedimentary deposits. basin was strongly influenced by plate tectonics. During the Aptian, the simple shear stress associ­ The outcrop area of the Sao Luis Basin com­ ated with lithospheric thinning led to the initial rifting. prises Upper Cretaceous (Cenomanian) reddish The basin has an assymetrical profile and is siliciclastics (sandstones, siltstones, shales and bounded from the neighboring Parnaiba and Bar­ mudstones) and some carbonates. These litholo­ reirinha basins by the Ferrer-Urbano Santos gies are grouped into the Itapecuru Formation, (south), Tocantins (west) and Rosario (east) struc­ which attains 2,000 m in thickness. Of total only 100 tural highs. Their pre-Cretaceous depositional his­ m of this unit are seen in outcrops. tory is linked with that of Parnaiba Basin, which Remains of a diversified paleobiota are found in altogether comprised a single, broad sedimentary this area, which include plants (angiosperms), mol­ area during the Paleozoic. lusks, fishes (bone fragments, scales, teeth) and In Figure 2 there is a summary of the lithostra­ reptiles (bones, teeth and ichnofossils). The com­ tigraphy of Sao Luis Basin , whose total sedimentary monest vertebrate fossils and ichnofossils belong to thickness attains 4,500 m (ARANHAeta/., 1990). The a theropod dinosaurian fauna that occurs over a outcrops of Cretaceous rocks are named as the wide geographic area. Environmental interpretation Itapecuru Formation. These rocks consist of reddish of the fossil-bearing lithofacies allows reconstruc­ sandstones, siltstones, shales and mudstones, with tion of a sandy tidal plain area, cut by freshwater and some interbedded carbonates composed of marls tidal channels, thus composing the scenary of a litto­ and limestones. The main sedimentary structures ral area submitted to a hot and dry climate. are channel and planar cross-stratification, ripple­ Of all ichnofossillocalities in the Sao Luis Basin, marks, fluidization structures, mud-cracks, herring­ two display the must abundant theropod tracks. The bone cross-stratification and hummocky cross­ best one is located at Ponta da Guia (Sao Luis stratification. The fossils found in these rocks are County) where it is possible to observe the parallel palynomorphs, plants (angiosperms), mollusks orientation of four large theropod trails, pointing out (Mytilidae, Inoceramidae, Pectinidae, Plicatulidae, to a possible gregarious behavior. This aspect of Limidae, Ostreidae, Trigonidae and Matricidae), 370 BRAZILIAN THEROPODS FROM THE EQUA TORIAL A TLANTIC MARGIN Basin POllia do FaroJ _____ ~-.r~- o 2km = Outcrops Fig. 1 - Location map of Sao Luis Basin, Brazil, and its paleogeographical position during Cenomanian. fishes (Dipnoi, Elasmobranchia and Actinopterygii) , counties: Ponta da Guia, Ponta do Farol, Praia do reptiles (Dinosauria, Crocodylia and Chelonia). Boqueirao, IIha do Medo, Praia da Baronesa and There are also vertebrate (dinosaurian footprints) IIha do Cajual (CARVALHO & ARAUJO, 1995). There and invertebrate ichnofossils. are trails and isolated footprints attributed to large and small theropods, and ornithischians. The best The environmental interpretation of outcrop li­ preserved footprints localities are at Ponta da Guia thofacies points out to estuarine,
Load more

Recommended publications
  • The Brazilian Cretaceous
    © Biodiversity Heritage Library, http://www.biodiversitylibrary.org/; www.zobodat.at in Zitteliana 10 277-283 München, I. Juli I983 ISSN 0373-9627 The Brazilian Cretaceous By IGNACIO MACHADO BRITO & DIÓGENES dc ALMEIDA CAMEOS*) With I text figure and 1 plate ABSTRACT The Cretaceous is one of the best known systems in Brazil, Owing to the impossibility of correlating the three first being very well represented in the basins of the Northeast, on phases with the international stratigraphic column, we here the continental shelf and covering the large palaeozoic basins. propose to them local stages which could also be identified on The system is presented in its most complete form on the the African Atlantic coastal basins: Donjoanian, Bahian and coastal and interior basins of the Northeast, since the Jura- Alagoan. Cretaceous transition until the Maastrichtian-Tertiary. The marine phase can be recognized since the Upper Aptian It can be divided into four phases: continental or prerift, la­ and it is almost perfectly correlated to the standard geological custrine or rift, transitional or saline, and marine. column. KURZFASSUNG Die Kreide ist eines der bestuntersuchten Systeme in Brasi­ „rifting“, Ubergangsphase oder brackisch salinar und voll­ lien; sie ist verbreitet in den Becken Nordost-Brasiliens und marine Phase. Da die ersten 3 Phasen nicht international zu auf dem Schelf. Am vollständigsten ist sie vertreten von der korrelieren sind, werden 3 lokale Einheiten benannt und defi­ Jura/Kreidc-Cirenze bis zur Maastricht/Tertiär-Grenze in niert, die sich auch in den westafrikanischen atlantischen Kü­ den Küstenbecken und den im Landesinnem gelegenen Bck- stenbecken erkennen lassen: Donjoanian, Bahian und Alago­ ken die Nordost-Brasilien repräsentieren.
    [Show full text]
  • Morfologia Pós-Craniana De Candidodon Itapecuruense (Crocodylomorpha, Mesoeucrocodylia), Do Cretáceo Do Brasil
    Revista Brasileira de Paleontologia 7(1):87-92, Janeiro/Junho 2004 © 2004 by the Sociedade Brasileira de Paleontologia MORFOLOGIA PÓS-CRANIANA DE CANDIDODON ITAPECURUENSE (CROCODYLOMORPHA, MESOEUCROCODYLIA), DO CRETÁCEO DO BRASIL PEDRO HENRIQUE NOBRE Depto. de Geologia, UFRJ, Av. Brigadeiro Trompowski, s/nº, Ilha do Fundão, 21.949-900, RJ, Brasil. [email protected] RESUMO – Candidodon itapecuruense Carvalho & Campos é um Mesoeucrocodylia, proveniente da Formação Itapecuru (Cretáceo Inferior), bacia do Parnaíba, Brasil. Esta espécie caracteriza-se por apresentar dentes de morfologia complexa, com uma cúspide principal e uma série de cúspides menores na base da coroa. São apresentados novos elementos referentes ao esqueleto pós-craniano de C. itapecuruense, bem como suas relações com outros Crocodylomorpha. O esqueleto pós-craniano de C. itapecuruense apresenta vértebras anficélicas com o corpo arredondado a levemente quadrangular. O úmero é alongado, cilíndrico e com uma crista deltopeitoral pronunciada. O fêmur é estreito, com a diáfise cilíndrica e reta. Os metatarsais são longos, delgados e com as extremidades pouco expandidas. Apresenta osteodermos muito delgados, de contorno quadrangular a cordiforme não ultrapassando 1mm de espessura, sendo a superfície interna lisa e a externa ornamentada com rugosidades e depressões irregulares. Em todos os osteodermos observa-se, na superfície externa, uma crista localizada no terço posterior da peça. Palavras-chave: Crocodylomorpha, Mesoeucrocodylia, Cretáceo Inferior, bacia do Parnaíba. Abstract – THE POSTCRANIAL MORPHOLOGY OF CANDIDODON ITAPECURUENSE (CROCODYLO- MORPHA, MESOEUCROCODYLIA), CRETACEOUS, OF BRAZIL. Candidodon itapecuruense Carvalho & Campos, 1988 is a Mesoeucrocodylia from the Itapecuru Formation (Lower Cretaceous), Parnaíba Basin, Brazil. This species is characterized by presenting teeth with a main cuspid and a series of smaller cuspids in crown base.
    [Show full text]
  • Abstracts (Pdf)
    63RD SYMPOSIUM FOR VERTEBRATE PALAEONTOLOGY AND COMPARATIVE ANATOMY & 24TH SYMPOSIUM OF PALAEONTOLOGICAL PREPARATION AND CONSERVATION WITH THE GEOLOGICAL CURATORS’ GROUP 1 CONTENTS Meeting Schedule 4 Abstracts SPPC talks 10 SVPCA talks 14 SVPCA posters 78 Delegate List 112 2 ACKNOWLEDGEMENTS The organisers would like to thank the Palaeontological Association for their support of this meeting, and also for their continued management of the Jones Fenleigh Memorial Fund. A huge amount of the work putting the meeting together was co-ordinated by Mark Young, including editing this Abstract volume, handling abstract submissions and overall organisation. We also thank Stu Pond and Jessica Lawrence Wujek for designing this year's SVPCA logo. Liz Martin-Silverstone and Jessica Lawrence Wujek co-ordinated most of the behind-the- scenes management for this meeting while Stu Pond designed this year’s Conference circulars. Our logo represents a local fossil, Polacanthus from the Isle of Wight (based on a fossil collected by Martin Simpson and Lyn Spearpoint). Finally, we thank Richard Forrest for working on the website and providing general information and support. This year’s meetings are supported by the Hampshire Cultural Trust, Dinosaur Isle, Geological Curators Group, Siri Scientific Press, Palaeocast and Frontiers in Earth Science. HOST COMMITTEE Ocean and Earth Science, University of Southampton, National Oceanography Centre Gareth Dyke John Marshall Darren Naish Mark Young Jessica Lawrence Wujek Liz Martin-Silverstone Stu Pond Aubrey Roberts James Hansford Hampshire Cultural Trust Christine Taylor Dinosaur Isle Gary Blackwell Geological Curator's Group Kathryn Riddington 3 MEETING SCHEDULE Monday 31st August 9:00-9:45 SPPC/GCG registration at NOC Security desk (4th floor) Session — SPPC Chair — Mark Young 10:00-10:20 Mark Graham Fossils, Footprints & Fakes 10:20-10:40 Emma Bernard A brief history of the best collection of fossil fish in the world – probably… 10:40-11:00 Jeff Liston et al.
    [Show full text]
  • 3 86-Itapecuruemys.Pdf
    Journal of South American Earth Sciences xxx (xxxx) xxx Contents lists available at ScienceDirect Journal of South American Earth Sciences journal homepage: www.elsevier.com/locate/jsames A new Cretaceous Pleurodira Pelomedusoides from the Lower Cretaceous of Parnaíba Basin, Brazil Diogo Lins Batista a,b,*, Ismar de Souza Carvalho b, Marcelo S. de la Fuente c a Universidade Federal do Rio de Janeiro, Instituto de Biologia, Programa de Pos-Graduaç´ ao~ em Biodiversidade e Biologia Evolutiva, Interbloco B/C, Av. Carlos Chagas Filho, 373, Cidade Universitaria,´ Ilha do Fundao,~ Rio de Janeiro, RJ, Brazil b Universidade Federal do Rio de Janeiro, Instituto de Geoci^encias, Departamento de Geologia, Laboratorio´ de Estudos Paleontologicos,´ Av. Athos da Silveira Ramos 274, Cidade Universitaria,´ Ilha do Fundao,~ Rio de Janeiro, RJ, Brazil c Instituto de Evolucion,´ Ecología Historica´ y Ambiente (IDEVEA-CONICET-Universidad Tecnologica´ Nacional, Facultad Regional San Rafael, Calle Urquiza 314, 5600, San Rafael, Provincia de Mendoza, Argentina ARTICLE INFO ABSTRACT Keywords: The new Pleurodira turtle Itapecuruemys amazonensis gen. et sp. nov. from the Itapecuru Formation (Parnaíba Pleurodira Basin, Brazil) is described. The new species is represented only by its holotype, which consists of an almost Pelomedusoides complete carapace and plastron, with an oval-shaped outline. The most peculiar characters of Itapecuruemys Lower Cretaceous amazonensis are: neural plates six and seven are separated by costal six, and the seventh neural plate contacts the Parnaíba basin sixth, seventh and eighth costal plates and a suprapygal. The phylogenetic hypothesis proposed in this paper Brazil suggests that Itapecuruemys amazonensis, together with Cearachelys and Galianemys spp., form a monophyletic assemblage and also widen the paleoherpetological diversity of the Itapecuru Formation in the Parnaíba Basin (Brazil).
    [Show full text]
  • The Morphology and Systematics of the Clam Shrimp Platyestheria Gen
    Cretaceous Research 91 (2018) 274e286 Contents lists available at ScienceDirect Cretaceous Research journal homepage: www.elsevier.com/locate/CretRes The morphology and systematics of the clam shrimp Platyestheria gen. nov. abaetensis (Cardoso) (Crustacea, Spinicaudata) from the Lower Cretaceous of the Sanfranciscana Basin, southeast Brazil * Jonathas S. Bittencourt a, , Rosemarie Rohn b, Oscar F. Gallego c, Mateo D. Monferran c, Alexandre Uhlein a a Laboratorio de Paleontologia e Macroevoluçao,~ Centro de Pesquisas Professor Manoel Teixeira da Costa, Departamento de Geologia, Instituto de Geoci^encias, Universidade Federal de Minas Gerais, Av. Presidente Antonio^ Carlos 6627, Pampulha, 31270-901, Belo Horizonte, MG, Brazil b Sao~ Paulo State University (UNESP), Institute of Geosciences and Exact Sciences, Department of Applied Geology, Rio Claro Campus, Av. 24A, 1515, 13506- 900, Rio Claro, SP, Brazil c Centro de Ecología Aplicada del Litoral, CONICET-UNNE and Geología Historica-Micropaleontología (Area Ciencias de la Tierra - Departamento de Biología), FaCENA-UNNE, Casilla de Correo 128, 3400 Corrientes, Argentina article info abstract Article history: New specimens of the clam shrimp ‘Pseudestheria’ abaetensis Cardoso, 1971 (Spinicaudata) are described. Received 6 February 2018 The material was collected from the Quirico Formation (Lower Cretaceous of the Sanfranciscana Basin), at Received in revised form the same locality as the type series of the species. The carapaces are very large, oval and elongated, with 4 May 2018 anteriorly located and slightly projected umbo, straight dorsal margin, with flattened growth bands and Accepted in revised form 22 June 2018 15e20 serrated growth lines. Details of the microscopic structure of the carapace were analysed under Available online 26 June 2018 scanning electron microscope for the first time, disclosing a unique reticular pattern of ornamentation.
    [Show full text]
  • The Neostratotype of Itapecuru Formation (Lower-Middle Albian) and Its Impact for Mesozoic Stratigraphy of Parnaíba Basin
    Anais da Academia Brasileira de Ciências (2019) 91(Suppl. 2): e20180730 (Annals of the Brazilian Academy of Sciences) Printed version ISSN 0001-3765 / Online version ISSN 1678-2690 http://dx.doi.org/10.1590/0001-3765201920180730 www.scielo.br/aabc | www.fb.com/aabcjournal The Neostratotype of Itapecuru Formation (Lower-Middle Albian) and Its Impact for Mesozoic Stratigraphy of Parnaíba Basin FRANCISCO J. CORRÊA-MARTINS1,2 1Programa de Pós-Graduação em Geologia, Universidade Federal do Rio de Janeiro, Avenida Athos da Silveira Ramos, 274, Ilha do Fundão, 21910-200 Rio de Janeiro, RJ, Brazil 2Departamento de Geociências, Instituto de Agronomia, Universidade Federal Rural do Rio de Janeiro, BR-465, Km 7, 23897-000 Seropédica, RJ, Brazil Manuscript received on July 23, 2018; accepted for publication on December 21, 2018 How to cite: CORRÊA-MARTINS FJ. 2019. The Neostratotype of Itapecuru Formation (Lower-Middle Albian) and Its Impact for Mesozoic Stratigraphy of Parnaíba Basin. An Acad Bras Cienc 91: e20180730. DOI 10.1590/0001- 3765201920180730. Abstract: This study defines the neostratotype of the Lower-Middle Albian Itapecuru Formation in the Parnaíba Basin, Northeast Brazil. In this sedimentary succession along the right bank of the Itapecuru River near the Itapecuru-Mirim City, Maranhão State, three lithofacies associations are recognized. The first is silty claystone with some very fine sand, micaceous, reddish color, thin laminated, showing a tabular aspect, interpreted as floodplain fines in a distal position. The second is clayey siltstone, reddish color, with ripple cross-lamination, very thin cross-laminated wacke lenses, grading to thin parallel lamination, in apparently tabular layers, interpreted as crevasse splay and distributive channels deposits in successive avulsion events.
    [Show full text]
  • The Cretaceous (Cenomanian) Continental Record of the Laje Do Coringa flagstone (Alcântara Formation), Northeastern South America
    Journal of South American Earth Sciences 53 (2014) 50e58 Contents lists available at ScienceDirect Journal of South American Earth Sciences journal homepage: www.elsevier.com/locate/jsames The Cretaceous (Cenomanian) continental record of the Laje do Coringa flagstone (Alcântara Formation), northeastern South America Manuel Alfredo Medeiros a,*, Rafael Matos Lindoso b, Ighor Dienes Mendes a, Ismar de Souza Carvalho b a Universidade Federal do Maranhão, Campus do Bacanga, Avenida dos Portugueses, s/n, CEP: 65.085-580 São Luís, MA, Brazil b Universidade Federal do Rio de Janeiro, Departamento de Geologia, CCMN/IGEO, CEP 21.949-900, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, RJ, Brazil article info abstract Article history: The fossil taxa of the Cenomanian continental flora and fauna of São Luís Basin are observed primarily in Received 25 August 2013 the bone bed of the Laje do Coringa, Alcântara Formation. Many of the disarticulated fish and tetrapod Accepted 8 April 2014 skeletal and dental elements are remarkably similar to the chronocorrelate fauna of Northern Africa. In this study, we present a summary of the continental flora and fauna of the Laje do Coringa bone-bed. The Keywords: record emphasizes the existence of a trans-oceanic typical fauna, at least until the early Cenomanian, Alcântara Formation which may be interpreted as minor evolutionary changes after a major vicariant event or as a result of a São Luís Basin land bridge across the equatorial Atlantic Ocean, thereby allowing interchanges between South America Cretaceous Cenomanian and Africa. The paleoenvironmental conditions in the northern Maranhão State coast during that time were inferred as forested humid areas surrounded by an arid to semi-arid landscape.
    [Show full text]
  • A New Genus of Dipnoiformes from the Cretaceous of Brazil
    “main” — 2011/10/18 — 12:41 — page 1181 — #1 Anais da Academia Brasileira de Ciências (2011) 83(4): 1181-1192 (Annals of the Brazilian Academy of Sciences) Printed version ISSN 0001-3765 / Online version ISSN 1678-2690 www.scielo.br/aabc A new genus of Dipnoiformes from the Cretaceous of Brazil CARLOS E.V. TOLEDO1, ELIANE P. DE SOUSA2, MANUEL A.A. MEDEIROS3 and REINALDO J. BERTINI4 1USP/IGC/GSA, Rua do Lago, 562, Cidade Universitária, Butantã, 05508-080 São Paulo, SP, Brasil 2UEMA/CECEN, Cidade Universitária Paulo VI, Bairro Tirirical, Caixa Postal 09, 65000-000 São Luís, MA, Brasil 3Departamento de Biologia, Universidade Federal do Maranhão, Campus do Bacanga, Avenida dos Portugueses, s/n, 65085-580 São Luís, MA, Brasil 4UNESP/IGCE/DGA/NEPV, Avenida 24-A, 1515, Campus Rio Claro, Bairro Bela Vista, 13506-900 Rio Claro, SP, Brasil Manuscript received on November 13, 2009; accepted for publication on March 1, 2011 ABSTRACT The Alcântara Formation, an important stratigraphic unit from the early Cenomanian of Brazil, was deposited under transitional (estuarine) conditions, and its fossil record includes fragmentary remains of plants, fishes, crocodylomorphs, pterosaurs and dinosaurs, with a noteworthy diversity of dipnoiformes tooth plates. The dipnoiformes material reported here comprises a new taxon, Equinoxiodus alcantarensis, gen. et sp. nov. Most of the identified morphotypes of continental vertebrates collected in the Alcântara Formation are similar to chronocorrelative faunas from Northern Africa, but this new genus of Dipnoiformes indicates some degree of paleogeographic isolation and endemism. This was probably caused by the widening of the equatorial Atlantic Ocean during the early Cenomanian, which may have selectively affected some species.
    [Show full text]
  • Accraian Series, 352-354 Acre Series, 55 Acre Subbasin, 32 A<;:U
    INDEX A Andrelandia Series, 431 Accraian Series, 352-354 AnnobonI~and,530-531 Acre Series, 55 Antarctic Peninsula, 210 Acre subbasin, 32 Anwiafutu Limestone, 361 A<;:u Formation, 122 Apollonian System, 361 A<;:ungui group, 433 Apora high, 92 Adamaoua Belt, 375 Aptian, 12, 14,94,98,104,109,118,191, massif, 385 201,306,307,308,320,329 Adolphskraa1 Shale, 268 Argentine Adrar succession, 466 continental platform, 136-139 Agoula River series, 315 - 316 marginal basins Agua Bonita graben, 37 basement ridge, 143-145 Agulhas basin, 264 Cretaceous units, 152-155 Agwu Shales, 364 general geology, 139-162 Ahlmannrygg Group, 226, 227 geologie development, 162-163 Ajua Shales, 354 post-Upper Jurassie sediments, 145-152 Akawaian episode, 395 pre-Upper Jurassie basement, 140-152 Alagoas graben, 95, 98 structurallineaments, 158-162 Albian, 14,94,98,108,118,119,309,312, tectonics, 160-162 320,329,358-359,373 Tertiary, 155-158 Alian<;:a Formation, 94, 98 Argiles du bas fleuve, 330 Alter do Chäo Formation, 57 Arufu Limestone, 359 Amapa Series, 395 Ascension Island, 539, 540, 542, 543 Amazon basin, 30-31 analyses, 500 Carboniferous,48-54 geology, 497 -499 Devonian sedimentation, 45-49 petrology, geochemistry, 499-501 igneous rocks, 69-74 sedimentation history ,74-79 Assabu sandstone, 465 structural pattern, 32-37 Asu River Group, 359 tectonic activity, 40 Atlantic Ameki Formation, 368 high, 118 Amelang Formation, 232, 233 highland, 253 Amsaga Series, 466, 468 Awaga Series, 320 Anambra embayment, 384 Azile Series, 321 575 576 Index B C Badagba quartzite, 474,
    [Show full text]
  • See in English
    SIGEP Geological and Paleontological Sites of Brazil SIGEP 013 Ichnofossils of the Porto Primavera Power Plant, State of São Paulo Dinosaur and mammal footprints in rocks from the Caiuá neocretaceous desert Luiz Alberto Fernandes 1 Fernando Antonio Sedor 2 Rafael Costa da Silva 3 Luiz Roberto da Silva 4 Adalberto Aurélio Azevedo 5 Alessandra Gonçalves Siqueira 6 1 Universidade Federal do Paraná - Depto. de Geologia/Caixa Postal 19.001/CEP 81531-990, Curitiba, Paraná/e-mail: [email protected] 2 Universidade Federal do Paraná - Museu de Ciências Naturais/e-mail: [email protected] 3 Companhia de Pesquisa de Recursos Minerais/RJ-DEGEO/DIPALE/e-mail: [email protected] 4 Companhia Energética de São Paulo – CESP/e-mail: [email protected] 5 Instituto de Pesquisas Tecnológicas do Estado de São Paulo S/A – IPT/e-mail: [email protected] 6 Instituto de Pesquisas Tecnológicas do Estado de São Paulo S/A – IPT/e.mail: [email protected] © Fernandes,L.A.; Sedor,F.A.; Silva,R.C.; Silva,L.R.; Azevedo,A.A.; Siqueira,A.G. 2008. Ichnofossils of the Porto Primavera Power Plant, State of São Paulo - Dinosaur and mammal footprints in rocks from the Caiuá neocretaceous desert. In: Winge,M.; Schobbenhaus,C.; Souza,C.R.G.; Fernandes,A.C.S.; Berbert-Born,M.; Queiroz,E.T.; (Edit.) Sítios Geológicos e Paleontológicos do Brasil. Available on line since 26/09/2008 at the address: http://www.unb.br/ig/sigep/sitio013/sitio013english.pdf [actually http://www.sigep.cprm.gov.br/sitio013/sitio013english.pdf] (The above bibliographic reference of author copy
    [Show full text]
  • Abstracts Volume
    63RD SYMPOSIUM FOR VERTEBRATE PALAEONTOLOGY AND COMPARATIVE ANATOMY & 24TH SYMPOSIUM OF PALAEONTOLOGICAL PREPARATION AND CONSERVATION WITH THE GEOLOGICAL CURATORS’ GROUP 1 CONTENTS Meeting Schedule 4 Abstracts SPPC talks 10 SVPCA talks 14 SVPCA posters 78 Delegate List 112 2 ACKNOWLEDGEMENTS The organisers would like to thank the Palaeontological Association for their support of this meeting, and also for their continued management of the Jones Fenleigh Memorial Fund. A huge amount of the work putting the meeting together was co-ordinated by Mark Young, including editing this Abstract volume, handling abstract submissions and overall organisation. We also thank Stu Pond and Jessica Lawrence Wujek for designing this year's SVPCA logo. Liz Martin-Silverstone and Jessica Lawrence Wujek co-ordinated most of the behind-the- scenes management for this meeting while Stu Pond designed this year’s Conference circulars. Our logo represents a local fossil, Polacanthus from the Isle of Wight (based on a fossil collected by Martin Simpson and Lyn Spearpoint). Finally, we thank Richard Forrest for working on the website and providing general information and support. This year’s meetings are supported by the Hampshire Cultural Trust, Dinosaur Isle, Geological Curators Group, Siri Scientific Press, Palaeocast and Frontiers in Earth Science. HOST COMMITTEE Ocean and Earth Science, University of Southampton, National Oceanography Centre Gareth Dyke John Marshall Darren Naish Mark Young Jessica Lawrence Wujek Liz Martin-Silverstone Stu Pond Aubrey Roberts James Hansford Hampshire Cultural Trust Christine Taylor Dinosaur Isle Gary Blackwell Geological Curator's Group Kathryn Riddington 3 MEETING SCHEDULE Monday 31st August 9:00-9:45 SPPC/GCG registration at NOC Security desk (4th floor) Session — SPPC Chair — Mark Young 10:00-10:20 Mark Graham Fossils, Footprints & Fakes 10:20-10:40 Emma Bernard A brief history of the best collection of fossil fish in the world – probably… 10:40-11:00 Jeff Liston et al.
    [Show full text]
  • (Sauropoda: Diplodocoidea) from the Middle Cretaceous of Northern Brazil
    Cretaceous Research 104 (2019) 104191 Contents lists available at ScienceDirect Cretaceous Research journal homepage: www.elsevier.com/locate/CretRes A new rebbachisaurid (Sauropoda: Diplodocoidea) from the middle Cretaceous of northern Brazil Rafael Matos Lindoso a, c, *, Manuel Alfredo Araújo Medeiros b, Ismar de Souza Carvalho c, Agostinha Araújo Pereira d, Ighor Dienes Mendes e, Fabiano Vidoi Iori f, Eliane Pinheiro Sousa g, Silvia Helena Souza Arcanjo b, Taciane Costa Madeira Silva b a Instituto Federal de Educaçao,~ Ci^encia e Tecnologia do Maranhao,~ Pro-Reitoria de Pesquisa, Pos-Graduaç ao~ e Inovaçao~ e PRPGI, Av. Colares Moreira, 477, Renascença, Sao~ Luís, MA, CEP: 65.075-441, Brazil b Universidade Federal do Maranhao,~ Campus do Bacanga, Avenida dos Portugueses, s/n, CEP: 65.085-580, Sao~ Luís, MA, Brazil c Universidade Federal do Rio de Janeiro, Departamento de Geologia, CCMN/IGEO, Cidade Universitaria, Ilha do Fundao,~ CEP: 21.949-900, Rio de Janeiro, RJ, Brazil d Centro de Pesquisa de Historia Natural e Arqueologia do Maranhao,~ Rua do Giz, 59, Centro, CEP:65.010-680, Sao~ Luís, Maranhao,~ Brazil e Universidade Federal do Rio de Janeiro, Programa de Pos-Graduaç ao~ em Biodiversidade e Biologia Evolutiva, CCS/IB, Cidade Universitaria, Ilha do Fundao,~ CEP: 21.941-902, Rio de Janeiro, RJ, Brazil f Museu de Paleontologia Pedro Candolo, Estaçao~ Cultura, Praça Farmac^eutico Bruno Garisto, CEP: 15.890-000, Uchoa, SP, Brazil g Universidade Estadual do Maranhao,~ Departamento de Biologia, Cidade Universitaria Paulo VI, CEP: 65.055-970, Sao~ Luís, MA, Brazil article info abstract Article history: A new genus and species of Rebbachisauridae sauropod from the Cenomanian of the Sao~ Luís Basin, Received 30 May 2018 Alcantara^ Formation, Itapeuasaurus cajapioensis gen.
    [Show full text]