Hssaida, T. and Chahidi, S. and Benzaggagh, M. and Riding, J.B. and Oumalch, F. (2014) Dinoflagellate cyst assemblages of the Upper Jurassic (Oxfordian-Tithonian) from the External Rif Chain (Internal Prerif and Mesorif, Morocco) and regional comparisons Associations de kystes de dinoflagellés des séries du Jurassique supérieur (Oxfordien-Tithonien) du Rif externe (Prérif interne et Mésorif, Maroc) et comparaisons régionales. Annales de Paleontologie, 100 (4). pp. 327-342.

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A biostratigraphic study of dinoflagellate cysts of the Upper Jurassic series from the eastern External RifChain, has been achieved for the first time on four outcrop sections : the DM section (Douar Marticha),the TB section (the Tarhchenna "Sof"), the KSD section (the Kef Mallou "Sof") and the Y section (DouarLamriene) among which three sections (TB, KSD and Y) are well-dated by ammonites and calpionellidsfauna. The DM and TB sections are complementary in terms of stratigraphy and correspond respectivelyto the upper part of the "Ferrysch" Formation, a thick shaly-silty and sandy sequence assigned to theCallovian-Oxfordian stages and to the El Gouzat limestones Formation (Kimmeridgian - Lower Tithonian age) and to the Tarhchenna marly limestones Formation (Upper Tithonian age) from the EL Gouzat area(Mesorif). The KSD and Y sections are also complementary and correspond to the Kimmeridgian-LowerTithonian Msila limestones Formation and to the overlying marly limestones Massif Formation of UpperTithonian age, outcropping in the Msila region (Internal Prerif). These four sections have shown manydinocysts rich levels, which had allowed characterizing the Middle? and Upper Oxfordian substages inthe DM section. In the other sections, the dinoflagellate cyst assemblages are nearly similar to those ofthe Kimmeridgian-Tithonian of many sections from the Boreal, Sub-boreal and North tethyan realms,particularily from England, Russia and South-East France basin. The results of the present work confirmonce again, the important value of dinoflagellate cysts, for age dating of ammonites-lacking Mesozoicsedimentary sequences and for biostratigraphic correlations. © 2014 Elsevier Masson SAS. All rights reserved.

Item Type: Article
Uncontrolled Keywords: Dinophyceae
Subjects: Earth and Planetary Sciences
Divisions: SCIENTIFIC PRODUCTION > Earth and Planetary Sciences
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:46
URI: http://eprints.umi.ac.ma/id/eprint/2897

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