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	On the Validity and Evolution of Assilina Species during the Ypresian-Lutetian: Example from Bir Dakhl, Eastern Desert, Egypt
	Al Menoufy Safia; Boukhary Mohamed
来源期刊	Acta Geologica Sinica
ISSN	1000-9515
出版年	2021
卷号	95 期号:4 页码:1080-1085
英文摘要	The genus Assilina is a taxon within the Nummulitacea that appeared early in the Ypresian (Early Eocene) and continued until the end of the Lutetian (Middle Eocene). Thus, this taxon could be useful for the chronostratigraphy of this time interval. Lower Eocene rocks in southern Galala, Egypt are exposed at Bir Dakhl. This section includes marl sediments with debris flow shallow-marine facies deposits laid down during early Eocene times and includes fossils of large foraminifera: Assilina placentula Deshayes, 1838 and Nummulites burdigalensis de la Harpe, 1926. These are systematically treated, described and illustrated. Nummulites burdigalensis belongs to the N. burdigalensis group, and Assilina placentula belongs to the group of Assilina exponens. This assumption is based on qualitative morphology and quantitative measurements. Both species, together with Operculina libyca Schwager, 1883, enable the assignment of the Bir Dakhl (D5-40 Section) to the Early Eocene, Ypresian (SBZ10 of Serra- Kiel et al., 1998) supporting an earlier opinion that Assilina placentula belongs to that zone in the calibrated larger foraminiferal biostratigraphic zonation.
英文关键词	foraminifera Assilina evolution Eocene Galala Egypt
类型	Article
语种	英语
收录类别	CSCD
WOS类目	Paleontology
CSCD记录号	CSCD:7032102
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/377392
作者单位	Al Menoufy Safia, University of Ain Shams, Faculty of Education, Department of Biological & Geological Sciences, Cairo, 11341, Egypt.; Boukhary Mohamed, Geology Department, University of Ain Shams, Faculty of Science, Cairo, 11566, Egypt.
推荐引用方式 GB/T 7714	Al Menoufy Safia,Boukhary Mohamed. On the Validity and Evolution of Assilina Species during the Ypresian-Lutetian: Example from Bir Dakhl, Eastern Desert, Egypt[J],2021,95(4):1080-1085.
APA	Al Menoufy Safia,&Boukhary Mohamed.(2021).On the Validity and Evolution of Assilina Species during the Ypresian-Lutetian: Example from Bir Dakhl, Eastern Desert, Egypt.Acta Geologica Sinica,95(4),1080-1085.
MLA	Al Menoufy Safia,et al."On the Validity and Evolution of Assilina Species during the Ypresian-Lutetian: Example from Bir Dakhl, Eastern Desert, Egypt".Acta Geologica Sinica 95.4(2021):1080-1085.