Benthic foraminiferal assemblages from maximum flooding surface J30, Middle Jurassic Dhruma Formation, Central Saudi Arabia

Stratigraphy ◽  
2020 ◽  
pp. 279-292
Author(s):  
Michael A. Kaminski ◽  
Abduljamiu O. Amao ◽  
Lamidi O. Babalola ◽  
Ramona Balc ◽  
Septriandi A. Chan ◽  
...  
Keyword(s):  
Saudi Arabia ◽  
Benthic Foraminifera ◽  
Middle Jurassic ◽  
Benthic Assemblage ◽  
Larger Foraminifera ◽  
Maximum Flooding Surface

ABSTRACT: The benthic foraminiferal have been studied from mudstone-wackestones of the D5 Unit of the Dhruma Formation that represent the Middle Jurassic J30 maximum flooding surface of Sharland et al. (2001). The benthic assemblage consists of a mixture of smaller agglutinated species, Haplophragmoides, Kutsevella, Sculptobaculites, Trochammina), and calcareous species (Nautiloculina, nodosariids, ophthalmidiids, polymorphinids, and spirillinids) without any larger foraminifera. The assemblage is indicative of open-marine midshelf conditions, and contains a number of cosmopolitan taxa that are known from the Middle Jurassic in other areas of the Tethys. The recovery of open-marine and cosmopolitan smaller benthic foraminifera in the D5 Unit of the Dhruma Formation provides a new tool for identifying the J30 maximum flooding surface and correlating the interval with other regions of the Tethys.

Middle Jurassic planktonic foraminifera in Saudi Arabia - a new biostratigraphical marker for the J30 maximum flooding surface in the Middle East

Stratigraphy ◽  
2018 ◽  
Vol 15 (1) ◽  
pp. 37-46 ◽  
Author(s):  
Michael A. Kaminski ◽  
Septriandi A. Chan ◽  
Ramona Balc ◽  
Hafiz Mehtab Gull ◽  
Abduljamiu O. Amao ◽  
...  
Keyword(s):  
Saudi Arabia ◽  
Middle East ◽  
Middle Jurassic ◽  
Planktonic Foraminifera ◽  
Maximum Flooding Surface

scholarly journals A new upper Oligocene marine record from northern Sinai (Egypt) and its paleogeographic context

GeoArabia ◽  
2008 ◽  
Vol 13 (1) ◽  
pp. 59-84 ◽  
Author(s):  
Jochen Kuss ◽  
Mohamed A. Boukhary
Keyword(s):  
Benthic Foraminifera ◽  
Lower Cretaceous ◽  
Depositional Environments ◽  
Larger Foraminifera ◽  
Larger Benthic Foraminifera ◽  
Sequence Stratigraphic ◽  
Upper Oligocene ◽  
Maximum Flooding Surface ◽  
Warm Temperate

ABSTRACT The upper Oligocene Wadi Arish Formation is composed of a carbonate-dominated succession at Gebel Risan Aneiza (Sinai). The 77-m-thick unit disconformably overlies Jurassic to lower Cretaceous carbonates and is subdivided into three members, comprising six lithofacies units. The lower Wadi Arish member contains three units, a gypsiferous sandstone unit (Oa), overlain by two limestone units (Ob and Oc). The middle Wadi Arish member is represented by a conspicuous marl unit (Od) that is overlain by two upper limestone units (Oe and Of) of the upper Wadi Arish member. We discuss the euphotic subtidal depositional environments in conjunction with macro- and microfacies characteristics. Six microfacies types are defined, dominated by grain associations of rhodoliths, larger benthic foraminifera (rotaliids), corallinaceans, bivalves, peloids, few corals, and bryozoans. They characterize rhodalgal associations, common in non-tropical warm-temperate settings. Biostratigraphy is based on larger foraminifera. The middle Wadi Arish member corresponds with SB 23 (Chattian) and may correlate with Pg50, a regional maximum flooding surface. Our sequence stratigraphic interpretations define a late lowstand to early transgressive systems tract (lower Wadi Arish member), a late transgressive systems tract (middle Wadi Arish member), while the upper Wadi Arish member reflects highstand conditions. The paleogeographic setting and sequence stratigraphic interpretation of this unique upper Oligocene outcrop is placed in context of the northeast African-Arabian region.

Early Silurian Benthic Foraminifera from Saudi Arabia - including the oldest known multichambered lituolids

Stratigraphy ◽  
2020 ◽  
pp. 141-185
Author(s):  
Michael A. Kaminski ◽  
Pramudya R. D. Perdana
Keyword(s):  
Saudi Arabia ◽  
New Species ◽  
North America ◽  
Benthic Foraminifera ◽  
Early Evolution ◽  
Foraminiferal Assemblage ◽  
New Findings ◽  
New Finding ◽  
Agglutinated Foraminifera

ABSTRACT: A diverse assemblage of early Silurian agglutinated foraminifera is described from the transitional facies between the Qusaiba and Sharawra Formations of theQalibah Group of Saudi Arabia. The agglutinated foraminiferal assemblage consists of 73 species belonging to 24 genera, and is found in in dark graptolite-bearing claystone of Aeronian age. The assemblage is highly diverse compared with coeval early Silurian assemblages reported from Europe and North America. The assemblage is comprised mainly of species belonging to the monothalamid genera Saccammina, Psammosphaera, Lagenammina, Thurammina, Thuramminoides, Amphitremoida, Bathysiphon, Rhabdammina, and the tubothalamid genera Hyperammina, Tolypammina and Turritellella. The new species Thuramminoides ellipsoidalis n. sp. is described herein, but many of the species left in open nomenclature are also likely to be new. The assemblage also includes rare specimens belonging to the globothalamid (lituolid) genera Ammobaculites and Simobaculites. This new finding revises our understanding of the early evolution of the multichambered globothalamid foraminifera. Although the simple multichambered with rectilinear chamber arrangement are known from the Ordovician, our new findings show that the coiled globothalamids belonging to the order Lituolida are older than previously thought, and were already present in Gondwana by about 440 Ma.

Lithofacies, paleoenvironment and high-resolution stratigraphy of the D5 and D6 members of the Middle Jurassic carbonates Dhruma Formation, outcrop analog, central Saudi Arabia

2018 ◽  
Vol 139 ◽  
pp. 463-479 ◽  
Author(s):  
Ibrahim M. Yousif ◽  
Osman M. Abdullatif ◽  
Mohammad H. Makkawi ◽  
Mazin A. Bashri ◽  
Waleed M. Abdulghani
Keyword(s):  
Saudi Arabia ◽  
High Resolution ◽  
Middle Jurassic ◽  
Outcrop Analog
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