Cretaceous (Albian–?early Santonian) palynology and stratigraphy of the Abu Tunis 1x borehole, northern Western Desert, Egypt

Deaf, Amr S.; Harding, Ian C.; Marshall, J.

doi:10.1080/01916122.2013.828662

Cited by 41 publications

(49 citation statements)

References 21 publications

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“…Many of the independently calibrated dinocyst bioevents of the Early Cretaceous European Tethys (Hardenbol et al, 1998) can be recognized in the southern Tethys. However, correlation of the Late Cretaceous bioevents is more problematic due to environmental exclusion, as has previously been observed in NE Libya (Thusu et al, 1988) and NW Egypt (Deaf et al, 2014). In the current study, late Barremian and Aptian dinocyst bioevents are closely comparable with their counterparts in northern Tethys (Fig.…”

Section: Regional and Intercontinental Biozonal Correlation And Linksmentioning

confidence: 94%

“…A summary of the stratigraphy, description of the formation lithologies of the sedimentary sequences of the north Western Desert of Egypt and the depositional environment of the Cretaceous sequences is shown in Figure 4. Detailed age dating and recognition of the originally undifferentiated rock units, which were deemed as "No Information" by the drilling company WEPCO (1968), were handled by Deaf et al (2014Deaf et al ( , 2016.…”

Section: Figure 2 About Herementioning

confidence: 99%

“…Further assessment of possible caving and/or lithological mixing was done by investigating the vertical distribution of the index palynomorph taxa. For details of the quantitative distribution of these palynomorphs, see Deaf et al (2014Deaf et al ( , 2016.…”

Section: Qualitative Analysismentioning

confidence: 99%

“…Although delta-front or delta channel settings are characterised by strong influxes of black wood (Tyson, 1995), the relatively low PF-2A concentrations of that maceral, coupled with extremely high brown wood concentrations, may be explained by the humid costal conditions inferred for the Albian (Deaf, 2009;Deaf et al, 2014). This could have resulted in very high runoff, enhancing supply of fresh brown wood (Tyson, 1995) that was coupled with high rates of deposition in the continuously subaqueous depositional setting, diluting the black wood concentrations (Lamberson et al, 1991).…”

Section: Depositional Environment: Deltaic (Delta Channel)mentioning

confidence: 99%

“…Although Cretaceous climatic conditions in the western part of the Northern Gondwana Phytogeographic Province have been investigated by several authors (e.g., Doyle et al, 1982;Herngreen et al, 1996;Doyle, 1999;Méon, 2001, 2006), those of northeastern Gondwana (including Egypt) have received less attention. Palynological studies of the latter area have examined regional climate and/or ecologically-controlled regional bioevents (e.g., Abdel-Kireem et al, 1996;Schrank, 2001;Deaf et al, 2014Deaf et al, , 2016Deaf and Tahoun, 2018) but the picture is very much incomplete. To further our understanding we firstly link the sedimentary succession in the Abu Tunis 1X well from the coastal Matruh Basin in the northern part of Egypt's Western Desert to the Tethyan Cretaceous sea level curve.…”

Section: Introductionmentioning

confidence: 99%

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Cretaceous (Hauterivian–Cenomanian) palaeoceanographic conditions in southeastern Tethys (Matruh Basin, Egypt): Implications for the Cretaceous climate of northeastern Gondwana

Deaf

Harding

Marshall

2020

Cretaceous Research

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Quantitative palynological, sedimentological, and geophysical data analyses of the Cretaceous Abu Tunis 1X well from the Matruh Basin, northwestern Egypt indicate deposition of four major alternating regressive-transgressive successions. Sedimentation was largely affected by the Tethyan 2nd order sea level changes, with minor overprints by regional tectonics. The Lower Cretaceous part of the succession shows regressive sequences of deltafront to delta-top (upper Hauterivian-lowermost upper Barremian), delta channel (upper Aptian-middle Albian), and distal deltaic (upper Albian) settings that were interrupted by transgressive inner-proximal middle shelf deposits (uppermost Barremian-middle Aptian). These sediment packages correspond to Tethyan sea level fall from the late Hauterivian to late Barremian, and to the early-middle Aptian long-term sea level high stand. The Tethyan late Aptian-middle Albian long-term (2nd order) sea level rise was masked by regional late Aptian-Albian uplift, which affected deposition of the later regressive sequence. The Cenomanian shows a change in depositional setting from a proximal inner shelf (lower Cenomanian) to a middle shelf setting (middle-upper Cenomanian), corresponding to the Tethyan long-term latest early-late Cenomanian sea level rise. We demonstrate that northeastern Gondwana (Egypt) experienced different climatic conditions from other parts of the Northern Gondwana Phytogeographic Province. The climate in Egypt shifted from less warm and more humid conditions of the Hauterivian-early Barremian to a warmer and drier climate during the late Barremian-middle Aptian, although never becoming as dry as western Northern Gondwana. Warmer and more humid conditions were reestablished during the late Aptian and became even more accentuated during the Albian-Cenomanian, in contrast to the warm and much drier climate of Northern Gondwana at that time. Turonian climatic conditions may have been less humid as a result of the breakup of the 2 Western Gondwanan supercontinent and the northeasterly drift of the African continent. The climatic conditions experienced in northeastern Gondwana developed through the early-mid Cretaceous as a result of changes in palaeolatitudinal position, variations in sea level, and shifts in the Intertropical Convergence Zone, which drove fluctuations between periods of warm humid and warm dry conditions.

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Section: Regional and Intercontinental Biozonal Correlation And Linksmentioning

confidence: 94%

Section: Figure 2 About Herementioning

confidence: 99%

Section: Qualitative Analysismentioning

confidence: 99%

Section: Depositional Environment: Deltaic (Delta Channel)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cretaceous (Hauterivian–Cenomanian) palaeoceanographic conditions in southeastern Tethys (Matruh Basin, Egypt): Implications for the Cretaceous climate of northeastern Gondwana

Deaf

Harding

Marshall

2020

Cretaceous Research

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Understanding an exceptional Afropollis‐dominated flora in the middle Cretaceous palaeotropics of the southern Tethys

El Atfy,

Coiffard,

El Beialy

et al. 2024

Papers in Palaeontology

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Afropollis is a common element in Cretaceous low‐latitude palynofloras ranging from the Barremian to the Cenomanian. Despite an abundant fossil record, its affinities are still elusive. Nine Afropollis‐rich subsurface samples from the Cenomanian Bahariya Formation in the northern part of the Western Desert of Egypt were palynologically analysed, and the palynoflora was compared with previously published material. The geographical distribution of Afropollis‐yielding strata was compared with known macrofloras. The Bahariya material yielded a distinct palynomorph assemblage dominated by an unusually high frequency of Afropollis jardinus, reaching up to 60.7% of the total palynomorph count. The dominance of A. jardinus may be ecologically related to a near‐coastal lacustrine or lagoonal environment. Its association with two kinds of macrofloras suggests that the plants producing A. jardinus may have been part of a tropical azonal vegetation type, either aquatic or mangrove‐like.

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The Evolution of Vegetation Through the Cretaceous of Egypt

Coiffard

Atfy

2023

Advances in Science, Technology &Amp; Innovation

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Cretaceous (Albian–?early Santonian) palynology and stratigraphy of the Abu Tunis 1x borehole, northern Western Desert, Egypt

Cited by 41 publications

References 21 publications

Cretaceous (Hauterivian–Cenomanian) palaeoceanographic conditions in southeastern Tethys (Matruh Basin, Egypt): Implications for the Cretaceous climate of northeastern Gondwana

Cretaceous (Hauterivian–Cenomanian) palaeoceanographic conditions in southeastern Tethys (Matruh Basin, Egypt): Implications for the Cretaceous climate of northeastern Gondwana

Understanding an exceptional Afropollis‐dominated flora in the middle Cretaceous palaeotropics of the southern Tethys

The Evolution of Vegetation Through the Cretaceous of Egypt

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