Lower and Middle Cenomanian ammonites from the Morondava Basin, Madagascar

Kennedy, W. J.; Walaszczyk, I.; Gale, A. S.; Dembicz, K.; Praszkier, T.

doi:10.2478/agp-2013-0027

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Tytuł artykułu

Lower and Middle Cenomanian ammonites from the Morondava Basin, Madagascar

Autorzy

Kennedy W. J. , Walaszczyk I. , Gale A. S. , Dembicz K. , Praszkier T.

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DOI

10.2478/agp-2013-0027

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Abstrakty

Lower and Middle Cenomanian ammonite assemblages have been collected on a bed-by-bed basis from localities at Vohipaly and Mahaboboka, Madagascar, as well as from outcrops around Berekata, all in the Morondava Basin, southwest Madagascar. These collections demonstrate the presence of the upper Lower Cenomanian Mantelliceras dixoni Zone and the lower Middle Cenomanian Cunningtoniceras inerme Zone of the north-western European standard sequence. These records indicate that the striking anomalies in the zonal assemblages of the classic divisions of the Madagascan Cenomanian are based on mixed assemblages, rather than a succession that differs radically from that elsewhere in the world. The dixoni Zone fauna is: Desmoceras cf. latidorsatum (Michelin, 1838), Pachydesmoceras kossmati Matsumoto, 1987, Forbesiceras sp., F. baylissiWright & Kennedy, 1984, F. largilliertianum (d'Orbigny, 1841), Mantelliceras cantianum Spath, 1926a, M. dixoni Spath, 1926b, M. mantelli (J. Sowerby, 1814), M. picteti Hyatt, 1903, M. saxbii (Sharpe, 1857), Sharpeiceras sp., S. falloti (Collignon, 1931), S. mocambiquense (Choffat, 1903), S. cf. florencae Spath, 1925, Acompsoceras renevieri (Sharpe, 1857), A. tenue Collignon, 1964, Calycoceras sp., Mrhiliceras lapparenti (Pervinquičre, 1907), Mariella (Mariella) stolizcai (Collignon, 1964), Hypoturrilites taxyfabreae (Collignon, 1964), Turrilites scheuchzerianus Bosc, 1801, Sciponoceras cucullatum Collignon, 1964, and Sciponoceras antanimangaensis (Collignon, 1964). The presence of Calycoceras in a Lower Cenomanian association represents a precocious appearance of a genus typically Middle and Upper Cenomanian in occurrence, and matches records from Tunisia. The inerme Zone yields a more restricted assemblage: Pachydesmoceras kossmati, Forbesiceras baylissi, Acanthoceras sp. juv., Cunningtoniceras cunningtoni (Sharpe, 1855) and Hypoturrilites taxyfabreae.

Słowa kluczowe

Madagascar Morondava Basin cenomanian ammonite succession ammonite zonation chronostratigraphy

Madagaskar dorzecze cenoman amonit sukcesja podział na strefy chronostratygrafia

Wydawca

Faculty of Geology of the University of Warsaw
Komitet Nauk Geologicznych PAN

Czasopismo

Acta Geologica Polonica

Rocznik

2013

Tom

Vol. 63, no. 4

Strony

625--655

Opis fizyczny

Bibliogr. 101 poz., il.

Twórcy

autor

Kennedy W. J.

jim.kennedy@oum.ox.ac.uk

Oxford University Museum of Natural History, Parks Road, Oxford OX1 3W and Department of Earth Sciences, Parks Road, Oxford OX1 3AN, United Kingdom

autor

Walaszczyk I.

Faculty of Geology, University of Warsaw, Al. Żwirki i Wigury 93, PL-02-089 Warszawa, Poland

autor

Gale A. S.

Department of Earth and Environmental Sciences, University of Portsmouth, Portsmouth PO1 3QL. United Kingdom

autor

Dembicz K.

Spirifer Geological Society, Warszawa, Poland

autor

Praszkier T.

Spirifer Geological Society, Warszawa, Poland

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