Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.623987
Title: Foraminifera of the Dammam formation (Eocene) in Iraq
Author: Al-Hashimi, Hisham
Awarding Body: University of London
Current Institution: Imperial College London
Date of Award: 1972
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Abstract:
The succession of the Dammam Formation (Eocene) in Iraq is examined in detail. A total of 99 species and varieties of Foraminiferida (34 large forms, 42 small benthonic and 23 planktonic) from 46 genera and 22 families are illustrated; 2 species and one variety of which are considered new. The abundant and well distributed Nummulites species permit the phylogenetic development of the genus to be followed in detail. The succession is divided into distinct litho- and biostratigraphical units. 3 planktonic concurrent range zones, 4 larger foraminiferidal assemblage zones and 3 benthonic local zones are recognised and correlated within the present area and with the corresponding zones outside Iraq. The Paleocene-Eocene boundary is placed on the Ummer Radhuma-Dammam Formation contact, whereas the Eocene-Oligocene boundary is marked by an unconformity. - The Lower-Middle Eocene unconformity is proved and found to be marked by a distinct faunal break, above which most of the Lower Lutetian is missing. Strata of Upper Eocene age, carrying typical plankto nic and-larger Foraminiferida, have been discovered in the Akashat section. The depositional environments and the different litho facies of the Eocene are discussed and illustrated on five facies maps. The Nummulitic Limestone facies changes late rally towards the south and southeastern area into an anhydrite (Sabhka) facies during the Lower Eocene. In the Up. Lutetian it passes laterally towards the north and northwest into a basinal facies of planktonic and benthonic marls and chalky limestones. Two sedimentary cycles are recognised; the first spanning the Paleocene-Lower Eocene, and the second the late Middle Upper Eocene.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.623987  DOI: Not available
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