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Besides first "Flysch-type" agglutinants textulariid forms like Gaudryina, Dorothia, Spiroplectammina are common. This biofacies is found in deeper parts of the Prerif Zone and in parts of the Mesorif. Spiroplectammina -Glomospira -biofacies. Glomospira, Ammodis-cus, Hormosina, Paratrochamminoides, Rhabdammina dominate the agglutinants. Typical calcareous. Rzehakina -Rhabdammina -Reussella -biofacies.


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Especially in assem-blagess with a high dominance of the Rhabdammina -group the amount of planktonic foraminifers can be very low. This biofacies is found in the hemipelagite-sequences of the Bab Taza and Oued Mekhacen formations. Rhabdammina -Hormosina -Rzehakina -biofacies. In some samples Allomorphina occurs as the last calcareous benthic form. This bifacies is found in the calci-turbiditic sequences of the Tanger Units.

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Recurvoides -Rhabdammina -Hormosina -biofacies. V -Comparison with other areas and paleobathymetric interpretation of biofacies assemblages. W1 CU. Distribution of Upper Cretaceous foraminiferal assemblages along Continental Margin transversals has been studied in quite different regions and has been compared to three different methods of water depth estimation. Distribution of selected species and groups of benthic foraminifers. Thickness of bars corresponds to relative abundance of species. Biofacies assemblages are from the following localities:. Rides Prerif: P3 locality A in Fig. Loukkos: L19 L22 locality J.

Mekhacen 2: M16A locality V. Foraminiferal assemblages closely related to the occurence of turbiditic sequences in the lower part of the Areny Wedge are mainly composed of "flysch-type" agglutinated foraminifera with only few calcareous benthic forms of the genera Anguloga velinella and Allomorphina ELSER, Lower slope assemblages 1 m water depth and abyssal assemblages: Characterizing forms on the North American Margin are Aragonia velascoensis, Reussella szajnochae, Osangularia utaturensis, Clavulina gabonica, Tritaxia aspera, Spiroplectammina dentata for the Lower Slope, and Aragonia ouezzanensis, Reussella.

Thus, especially shelf assemblages and bathyal assemblages can be distinguished. An upper depth limit of about m is typical for the following maastrichtian species, which, in the Rif, are restricted to assemblages of the Prerif 2 and more northerly units compare Fig. These authors stress the consistent occurence of several agglutinated genera and species i.

Reussella-Dorothia-Glomospira -assemblages biofacies 2 : upper to middle bathyal. Spiroplectammina-Glomospira -assemblages biofacies 3 : middle bathyal. Especially in this zone partial dissolution of forminiferal tests within the sediment is an important factor controlling faunal composition.

Field work for this study was financilly supported by the Deutsche Forschungsgemeinschaft project "Gibraltarbogen". The technical assistance of the Geo-. Various aspects of this study have benefited from discussions whith E. Deep-Sea Exp. Deep Sea Drilling Project Leg H -Planktonic foraminifera: selective dissolution and the lysocline. Marine Geology, 8, pp. BUTT A. Cushman Lab. Paleogography, Paleo-climatology, Paleocology, 37, pp.

The Sea 7. Tubingen, p. Benthos 2nd Int. Benthic Foraminifera Pau ; pp. HAIG D. Ustred Ustav. Rozpravy, 39, pp. Office pp. Journal of Geology, 84, pp.


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Leg 27 of the Deep Sea Drilling Project. Universitat Tubingen p.

Micro-paleontology, 28, pp. Cahiers de Micropaleontologie, 3, pp. Memoire DSDP, 75, pp.

Changes in North Atlantic circulation at the end of the Cretaceous greenhouse interval

Unpublished PhD dissertation, Rutgers University, p. Eclogae geol. Geologie en Mijn-bouw, 64, pp. Marine Micropaleontology, 8, pp. Deep-Sea Research, 18, pp. Leg 39, Deep Sea Drilling Project. Maroc, a.

Associated Data

Maroc, b. Planches photographiques. Aragonia cf. Aragonia ouezzanensis REY, Ellipsopolymorphina aff. Ramulina cf. Fissurina cf.


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  8. Plate II - "Flysch-type" agglutinated foraminifers of the middle to lower bathyal hemipelagites of the external Tanger Unit biofacies 4, Bab Taza-sequence ; Lower - Middle Maastrichtian. Paratrochamminoides cf. Spiroplectammina dentata ALTH, Calcareous benthic foraminifers of the middle to lower bathyal hemipelagites of the external Tanger Unit biofacies 4, Bab Taza-sequence; Lower-Middle Maastrichtian. Ellipsoglandulina cf.

    Scale bar is micron. Hyperammina cf. Glomospira Tolypammina? Paratrochamminoides sp. Plectina cf. Upper Cretaceous foraminiferal assemblages of the external units of the Rif Northern Morocco - a paleobathymetric model of the Late Mesozoic North African continental margin [article] W. Plan Introduction [link] I -Geology of the external zones in the western rif and campo de Gibraltar [link] I.

    Structural units and corresponding stratigraphical series [link] 1. Rides Prerifaines [link] 2. Prerif Zone [link] 3. Mesorif Zone [link] 4. Loukkos-Zone [link] 5a. Nappe du Habt and corresponding series of the external Tanger Unit [link] 5b. External Tanger Unit Bab Taza formation [link] 6. Ketama-Unit [link] 7. Internal Tanger [link] 8. Sedimentological observations [link] II. Gaudryina -Frondicularia -biofacies [link] 2.

    Reussella -Dorothia -Glomospira -biofacies [link] 3. Spiroplectammina -Glomospira -biofacies [link] 4. Rzehakina -Rhabdammina -Reussella -biofacies [link] 5. Rhabdammina -Hormosina -Rzehakina -biofacies [link] 6. Scale bar is micron [link]. Liste des illustrations Figure 1 : Geological scetch map with sampled areas, palinspastic reconstruction and simplified structural relations of the External Tellian units in the Western Rif Internids and those flysch units which are related to the Internids with respect to their resediments Thurow, are combined.

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    Nomenclature according to Durand Delga et al. Ammodiscus sp [link] Plate II - "Flysch-type" agglutinated foraminifers of the middle to lower bathyal hemipelagites of the external Tanger Unit biofacies 4, Bab Taza-sequence ; Lower - Middle Maastrichtian. Glomospirella gaultina Berthelin, [link] Plate II - "Flysch-type" agglutinated foraminifers of the middle to lower bathyal hemipelagites of the external Tanger Unit biofacies 4, Bab Taza-sequence ; Lower - Middle Maastrichtian.