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001-es BibID:	BIBFORM125129
035-os BibID:	(WOS)001278301800006
Első szerző:	Mansour, Heba
Cím:	Palaeoenvironmental analysis of bivalve-dominated concentrations from the lower-middle Miocene succession, Gebel Gharra, Cairo-Suez District, Egypt / Mansour, Heba; Mandor, Mona; El-Sabbagh, Ahmed; El Hedeny, Magdy; Vinn, Olev; Alkahtane, Abdullah; Al Farraj, Saleh; Dávid, Árpád; El-Refaiy, Ahmed; Rashwan, Mohamed
Dátum:	2024
ISSN:	0024-1164
Megjegyzések:	The most conspicuous feature of the lower?middle Miocene deposits of Gebel Gharra, Cairo-Suez District of Egypt, is the presence of three pectinid-and two oyster shell concentrations. They are paucispecific to polyspecific macrobenthic biotopes. Their shells were significantly colonized by abundant endobionts and common epibionts, characterising the Entobia ichnofacies, and representing successive phases of colonization and bioerosion on stable substrates with a low sedimentation rate in high energy, shallow marine environments. Four types of shell concentrations have been distinguished. Pectinid-shell concentration of bed 2 is interpreted as a simple transgressive lag concentration that formed by reworking of previous deposited sediments in a shoal environment. Pectinid-shell concentration of bed 13 represents a coquina of high and moderately convex, sub-horizontally oriented to chaotic, and highly disarticulated and fragmented pectinid valves. It is interpreted as a remnant of previously deposited sediments that have been reworked by a single storm event without major transport of shells, and deposition in a lagoon environment. Pectinid-shell concentration of bed 14b is characterized by completely disarticulated, highly fragmented, moderately to densely packed, and re-oriented pectinid shells. It represents a composite concentration that was originated in a lagoon environment by sporadic high-energy events. Oyster-dominated concentrations of beds 9 and 22 represent ♭within-habitat' environmentally condensed assemblages, and formed by densely fossiliferous deposits with highly disarticulated, convex-up oysters along with articulated specimens preserved in life position, and with a moderate to high grades of bioerosion and encrustation. They were deposited by several high-energy events in supratidal and lagoonal environments, respectively. ? Shell concentrations, taphonomy, palaeoecology, palaeoenvironment, Miocene, Egypt. ? 2024 Author(s).
Tárgyszavak:	Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Egypt Miocene palaeoecology palaeoenvironment Shell concentrations taphonomy
Megjelenés:	Lethaia. - 57 : 2 (2024), p. 1-29. -
További szerzők:	Mandor, Mona El-Sabbagh, Ahmed El Hedeny, Magdy Vinn, Olev Alkahtane, Abdullah Al Farraj, Saleh Dávid Árpád El-Refaiy, Ahmed Rashwan, Mohamed
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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