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Journal of Micropalaeontology An open-access journal of The Micropalaeontological Society
J. Micropalaeontol., 37, 149-152, 2018
https://doi.org/10.5194/jm-37-149-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
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. Kaminski1, Muhammad Hammad Malik1, and Eiichi Setoyama2 1King Fahd University of Petroleum & Minerals, GeoSciences Department, Dhahran, 31261, Saudi Arabia
2Energy & Geoscience Institute, University of Utah, 423 Wakara Way, Suite 300, Salt Lake City, Utah 84108, USA
Abstract. We report the occurrence of an Ammobaculoides-dominated assemblage 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 green shale of the D1 unit (also known as 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 Plummer, 1932.

Citation: Kaminski, M. A., Malik, M. H., and Setoyama, E.: The occurrence of a shallow-water Ammobaculoides assemblage in the Middle Jurassic (Bajocian) Dhruma Formation of Central Saudi Arabia, J. Micropalaeontol., 37, 149-152, https://doi.org/10.5194/jm-37-149-2018, 2018.
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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.
We report the occurrence of a foraminiferal assemblage dominated by Ammobaculoides in the...
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