Articles | Volume 37, issue 1
https://doi.org/10.5194/jm-37-149-2018
https://doi.org/10.5194/jm-37-149-2018
Research article
 | 
11 Jan 2018
Research article |  | 11 Jan 2018

The occurrence of a shallow-water Ammobaculoides assemblage in the Middle Jurassic (Bajocian) Dhruma Formation of Central Saudi Arabia

Michael A. Kaminski, Muhammad Hammad Malik, and Eiichi Setoyama

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Cited articles

Al-Dhubaib, A. J.: Taxonomy and palaeoenvironments of Middle and Late Jurassic Foraminifera and its associations of Saudi Arabia, unpublished PhD thesis, University College London, 401 pp., 2010.
Arkell, W. J.: Jurassic ammonites from Jebel Tuwaiq, central Arabia, Philos. T. R. Soc. B, 36, 241–313, 1952.
Azbel, A. Y. and Grigalis, A. A. (Eds.): The Practical Manual of Microfauna of the USSR: Mesozoic Foraminifera, “Nedra” Publishers, Leningrad, 1991.
Bramkamp, R. A. and Steineke, M.: Stratigraphical introduction, in: Jurassic ammonites from Jebel Tuwaiq, central Arabia, edited by: Arkell, W. J., Philos. T. R. Soc. B, 236, 241–313, 1952.
Enay, R. and Mangold, C.: First zonation by ammonites of Saudi Arabia Jurassic, a reference for the Arabian Province, Geobios, Memoire Special, 17, 161–174, 1994.
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Short summary
We report the occurrence of a foraminiferal assemblage dominated by Ammobaculoides in the lowermost member of the Middle Jurassic Dhruma Formation exposed west of Riyadh, Saudi Arabia. The new species Ammobaculoides dhrumaensis n.sp. is described from the D1 unit (the Balum Member) of the Dhruma Formation, which has been assigned an early Bajocian age based on ammonites. Our new finding constitutes the oldest reported worldwide occurrence of the agglutinated foraminiferal genus Ammobaculoides.