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DOI	10.1016/j.jafrearsci.2019.103516
	Foraminiferal biostratigraphy and paleoenvironment of the middle and Upper Eocene succession at Cairo - Helwan area, north Eastern Desert, Egypt
	Abd El-Gaied, Ibrahim M.1; Attia, Gamal M.2; Mahmoud, Abd El-Aziz A.2; Abu Bakr, Safaa 2
通讯作者	Abd El-Gaied, Ibrahim M.
来源期刊	JOURNAL OF AFRICAN EARTH SCIENCES
ISSN	1464-343X
EISSN	1879-1956
出版年	2019
卷号	158
英文摘要	The foraminiferal content of the Middle and Upper Eocene rocks in the area to the east of Cairo-Helwan road studied in details in the present work. A rich benthic foraminiferal assemblages were identified and systematically classified, where 178 species and subspecies, belonging to 79 genera, 47 families and 22 superfamilies were recorded from seven selected surface sections. The studied succession is lithologically described and subdivided into three rock units, which are from the base: Observatory Formation, Qurn Formation (Middle Eocene) and Maadi Formation (Upper Eocene). The vertical distribution of the identified foraminiferal species participated in subdivision the studied sequence into seven local small benthic biozones which are: Elphidium cherifi, Quinqueloculina seminula, Nonionella africana, Brizalina cookei, Nonion scaphum zones (Middle Eocene), Bolivina carinata and Halkyardia minima zones (Upper Eocene). These biozones were described, discussed and correlated with their equivalent in different localities in Egypt. The identified planktonic species are few and scattered through the succession, and so not taken into consideration in the biostratigraphic classification. The statistical analysis of the identified benthic foraminiferal assemblages, besides the lithologic characters are used in interpreting the paleoecology and environmental conditions that were prevailed during the deposition of the studied rock units, where a warm, hypo-to hypersaline inner to middle shelf environment with high to moderate oxygen conditions and water depth fluctuated between 30 and 100 m are the most characteristic paleoecological conditions for the studied succession.
英文关键词	Middle and upper eocene Benthic foraminifera Biostratigraphy Paleoecology Cairo-Helwan area Eastern desert
类型	Article
语种	英语
国家	Egypt
收录类别	SCI-E
WOS记录号	WOS:000483456700013
WOS关键词	SEQUENCE STRATIGRAPHY ; QUANTITATIVE-ANALYSIS ; BENTHIC FORAMINIFERA ; FACIES ANALYSIS ; PALEOECOLOGY
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216628
作者单位	1.Beni Suef Univ, Fac Sci, Dept Geol, Bani Suwayf, Egypt; 2.Helwan Univ, Fac Sci, Dept Geol, Helwan, Egypt
推荐引用方式 GB/T 7714	Abd El-Gaied, Ibrahim M.,Attia, Gamal M.,Mahmoud, Abd El-Aziz A.,et al. Foraminiferal biostratigraphy and paleoenvironment of the middle and Upper Eocene succession at Cairo - Helwan area, north Eastern Desert, Egypt[J],2019,158.
APA	Abd El-Gaied, Ibrahim M.,Attia, Gamal M.,Mahmoud, Abd El-Aziz A.,&Abu Bakr, Safaa.(2019).Foraminiferal biostratigraphy and paleoenvironment of the middle and Upper Eocene succession at Cairo - Helwan area, north Eastern Desert, Egypt.JOURNAL OF AFRICAN EARTH SCIENCES,158.
MLA	Abd El-Gaied, Ibrahim M.,et al."Foraminiferal biostratigraphy and paleoenvironment of the middle and Upper Eocene succession at Cairo - Helwan area, north Eastern Desert, Egypt".JOURNAL OF AFRICAN EARTH SCIENCES 158(2019).