Stratigraphic position of the Cretaceous-Tertiary boundary in the northern Sirt Basin, Libya

Tmalla, A.F.A.

doi:10.1016/0264-8172(92)90065-m

Cited by 9 publications

(9 citation statements)

References 11 publications

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“…The published and unpublished literature on the foraminiferal studies covering Paleocene section of the Sirt Basin (Berggren, 1969(Berggren, , 1974Tmalla, 1992Tmalla, , 1996Lehmann, 1964;andEdwards et al, 1991a, 1991b) have shown no information on integration of the Beda Formation with Middle Paleocene (Montian) foraminiferal biostratigraphic zones.…”

Section: Miscellaneous Palynomorphsmentioning

confidence: 99%

“…There are few references on the foraminiferal studies covering Paleocene section of the Sirte Basin (Berggren, 1969(Berggren, , 1974Tmalla, 1992Tmalla, , 1996Lehmann, 1964). Additionally, there are several unpublished reports on the biostratigraphic studies of the wells in the Sirte Basin by Robertson Group Plc, where they have defined Paleocene sections in several wells (Edwards et al, 1991a(Edwards et al, , 1991b.…”

Section: Miscellaneous Palynomorphsmentioning

confidence: 99%

“…Biostratigraphical studies by Tmalla (1992Tmalla ( , 1996 and determination of facies changes by Lehmann (1964) across the Cretaceous-Tertiary boundary in the Sirte Basin includes some micropaleontological data on the Paleocene. There are several unpublished reports on the biostratigraphic studies of the well sections in the Sirte Basin by the Robertson Research, where they have defined Paleocene sections in several wells.…”

Section: The Beda Formationmentioning

confidence: 99%

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New palynological evidence for the age of the Beda Formation, Sirte Basin, Libya

Kumar

2016

Palaeontologia Electronica

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The Beda Formation represents the subsurface sequence of interbedded limestone with subordinate dolomites, which are major hydrocarbon reservoirs in the western Sirte Basin of Libya. Middle Paleocene (Montian) age has been assigned to this formation based on foraminifera, but the list of those age diagnostic foraminifera could not be found in the published literature, thus the age of this formation is questionable. Thick Paleocene-Early to Middle Eocene limestones and calcareous claystones also occur in this basin. Palynological study of 32 core samples of the Beda Formation from four different wells was carried out; but only four samples of Core # 1 (6854'-6884') in the Well # X43 yielded low diversity yet workable assemblages of palynomorphs. The pollen grains and spores indicate a Paleogene age. However, the dinoflagellate cyst assemblages provide several stratigraphically significant forms that indicate an EarlyMiddle Eocene age.The results of the present study suggest that either the studied samples do not belong to the Beda Formation or the age of the Beda Formation ranges from Middle Palaeocene to Early-Middle Eocene. An extensive study of large numbers of core samples from several well sections is suggested to generate new micropaleontological and palynological data that could conclusively define age of the Beda Formation.

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Section: Miscellaneous Palynomorphsmentioning

confidence: 99%

Section: Miscellaneous Palynomorphsmentioning

confidence: 99%

Section: The Beda Formationmentioning

confidence: 99%

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New palynological evidence for the age of the Beda Formation, Sirte Basin, Libya

Kumar

2016

Palaeontologia Electronica

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“…In the current research, however, we confirm their conclusion for placing the contact of the Upper Cretaceous-Palaeogene at the top of the "Socna Mollusc Bed" nevertheless we have included the later unit as the upper-most part of the Lower Tar Member. Further details concerning the Cretaceous-Palaeogene boundary in the studied region and the nearby Sirt Basin can be found in Tmalla (1992;; Tshakreen & Gasiñski (2004); Tawadros (2012).…”

Section: Background and Stratigraphymentioning

confidence: 99%

“…The field investigations led to the recognition of three members, they are, from oldest to youngest, the Lower Tar Member, the Upper Tar Member and the Had Member (Figure 3). Several authors including Burollet (1960); Jordi & Lonfat (1963); Barr (1972); Barr & Weegar (1972); Eliagoubi & Powell (1980); Butt (1986); Salaj & Nairn (1987); Tmalla (1992;; Imam (2001); Tshakreen et al (2002); Tshakreen & Gasiński (2004); Shiref & Salaj (2007) and more recently Tshakreen et al (2017) have contributed to the stratigraphy and depositional history of these rock units and their coeval deposits, both in outcrop and in the subsurface from different parts of the region.…”

Section: Introductionmentioning

confidence: 99%

Stratigraphy and Sedimentology of Upper Cretaceous to Upper Palaeocene Succession in Zimam Formation Along Wadi Tar al Kabir, NW Libya

Abdulsamad¹,

Emhanna²,

Asmaeil³

et al. 2020

ESR

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The Upper Cretaceous to Upper Palaeocene rocks of the Zimam Formation along the southwestern escarpment of the Hun Graben of NW Libya have been stratigraphically investigated from two stratigraphical sections in wadi Tar al Kabir. The field investigations led to the recognition of three members, from the oldest to the youngest, the Lower Tar Member, the Upper Tar Member and the Had Member. Eight sedimentary facies were distinguished at outcrop-scale and several microfacies were recognized and the outcome indicates that the depositions of the Zimam Formation are corresponding to two transgressive-regressive sedimentary cycles. The first cycle is attributed to the Lower Tar Member in which small planktonic foraminifera is quite common in the Campanian whereas the larger benthic foraminifera, namely, Omphalocyclus macroporus and Siderolites calcitrapoides are abundant in the Maastrichtian. The last occurrence of the latter two taxa, however, was used to delineate the contact between the Maastrichtian and Danian stages in the studied sequence. Up-sequence the sediments of the Upper Tar Member along with the overlying Had Member correspond to the second transgressive-regressive sedimentary cycle. Herein, the Upper Tar Member is enriched by small benthic foraminifera; Neoeponides duwi and Cibicides cf. libycus, and has been ascribed to the Danian (Lower Palaeocene). The reaming sediments of Zimam Formation, however, are belonging to the overlying Had Member and is tentatively ascribed to the Selandian (Upper Palaeocene) based on the last occurrence of the Danian fauna and the total range of the codiacean algae Ovulites morelleti.

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Stratigraphy

Hallett¹

2016

Petroleum Geology of Libya

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Stratigraphic position of the Cretaceous-Tertiary boundary in the northern Sirt Basin, Libya

Cited by 9 publications

References 11 publications

New palynological evidence for the age of the Beda Formation, Sirte Basin, Libya

New palynological evidence for the age of the Beda Formation, Sirte Basin, Libya

Stratigraphy and Sedimentology of Upper Cretaceous to Upper Palaeocene Succession in Zimam Formation Along Wadi Tar al Kabir, NW Libya

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