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Facies

, Volume 19, Issue 1, pp 77–95 | Cite as

Facies and stratigraphy of early to middle cretaceous (Late Aptian-Early Cenomanian) strata from the northern rim of the African Craton (Gebel Maghara—Sinai, Egypt)

  • Jochen Kuss
  • Felix Schlagintweit
Article

Summary

Thin-section analysis of Late Aptian/Early Cenomanian limestones was carried out in respect to the distribution of components and biota. All the sedimentological data were used for interpreting the depositional environment. The sequence starts with Early Cretaceous sandstones; sandy dolomites form the transition to massive limestones, which prevail in the middle and upper parts of the section. They indicate shallow marine carbonate platform conditions at the northern rim of the African Craton: Thick accumulations of tidal carbonate shoals interfinger with quiet-water subtidal and intertidal to supratidal strata. The paleogeographic importance of the sequence is emphasized by comparison with contemporaneous strata in Israel and northern Egypt.

Orbitolinids are most important fossils for stratigraphic analysis:Dictyoconus algerianus, Orbitolina (M.) texana, O. (M.) subconcava andO. (M.) aperta were joined by other minor foraminifera and a diverse algal flora. The youngest dateable sample withO. (M.) aperta andO. (M.) subconcava indicates a Late Albian age (Fig. 5); the overlying sequence ranges to the Cenomanian. Abfolge beginnt mit unterkretazischen Sandsteinen-sandige Dolomite leiten über zu massiven Kalken, die in den mittleren und oberen Profilabschnitten überwiegen. Sie zeigen eine flachmarine Karbonatplattform am Nordrand des Afrikanischen Kratons an, die durch Verzahnung von mächtigen Kalksandbarren mit subtidalen Ruhigwasserab-lagerungen ininter- bis supratidalen Bereichen gekenn-zeichnet ist. Die paläogeographische Bedeutung dieses Profiles wird durch Vergleiche mit zeitgleichen Ablagerungen in Israel und Nordägypten verdeutlicht.

Die stratigraphische Einstufung erfolgte mit Orbitoliniden:Dictyonconus algerianus, Orbitolina (M.) texana, O. (M.) subconcava undO. (M.) aperta wurden durch weitere Foraminiferen und Algen ergänzt. Die jüngste datierbare Probe zeigt mitO. (M.) aperta undO. (M.) subconcava oberes Alb an (Fig. 5); die überlagernde Abfolge reicht ins Cenoman.

Keywords

Microfacies Biostratigraphy Orbitolinids Calcareous Algae Facies Models Paleogeography Sinai/Egypt Early to Middle Cretaceous 

Fazies und Stratigraphie unter-bis mittelkretazischer Ablagerungen (Oberapt—Untercenoman) vom Nordostrand des afrikanischen Kratons (Gebel Maghara—Sinai, Ägypten)

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Copyright information

© Institut für Paläontologie, Universität Erlangen 1988

Authors and Affiliations

  • Jochen Kuss
    • 1
  • Felix Schlagintweit
    • 2
  1. 1.Institut für Geologie und PaläontologieTechnische UniversitätBerlin
  2. 2.Institut für Paläontologie und historische Geologie, UniversitätMünchen

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