Palynology of some Cretaceous mudstones from southeast Aswan, Egypt: significance to regional stratigraphy

Mahmoud, Magdy S.; Essa, Mahmoud A.

doi:10.1016/j.jafrearsci.2006.10.002

Cited by 9 publications

(3 citation statements)

References 11 publications

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“…The most significant palynofloral event is the absence of elaterates, which was also the case for other assemblages from the Maghrabi Formation within the Kharga Oasis [ 26 , 65 ]. Similar results were also gained from southeast Aswan [ 148 ], as reported earlier from the north Western Desert assemblages.…”

Section: Discussionsupporting

confidence: 90%

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Vegetation and climate change at the southern margin of the Neo-Tethys during the Cenomanian (Late Cretaceous): Evidence from Egypt

et al. 2023

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Changes in terrestrial vegetation during the mid-Cretaceous and their link to climate and environmental change are poorly understood. In this study, we use plant macrofossils and analysis of fossil pollen and spores from the Western Desert, Egypt, to assess temporal changes in plant communities during the Cenomanian. The investigated strata have relatively diverse sporomorph assemblages, which reflect the nature of parent vegetation. Specifically, the palynofloras represent ferns, conifers, monosulcate pollen producers, Gnetales, and a diverse group of angiosperms. Comparisons of both, dispersed palynoflora and plant macrofossils reveal different characteristics of the palaeoflora owing to a plethora of taphonomical and ecological biases including the depositional environment, production levels, and discrepancies between different plant organs. A combination of detailed records of sporomorphs, leaves, and charcoal from the studied successions provide new understandings of the palaeoclimate and palaeogeography during the Cenomanian and Albian-Cenomanian transition in Egypt. The mixed composition of the palynofloral assemblages reflects the presence of different depositional situations with a weak marine influence, as evidenced by a minor dinoflagellate cysts component. The local vegetation comprised various categories including herbaceous groups including ferns and eudicots, fluvial, open environments, and xeric arboreal communities dominated by Cheirolepidiaceae and perhaps including drought- and/or salt-tolerating ferns (Anemiaceae) and other gymnosperms (Araucariaceae, Ginkgoales, Cycadales, and Gnetales) as well as angiosperms. The presence of riparian and freshwater wetland communities favouring aquatic and/or hygrophilous ferns (of Salviniaceae and Marsileaceae), is noted. The wide variation of depositional settings derived from the palynological data may be attributed to a prevalent occurrence of producers in local vegetation during the early Cenomanian of Egypt. For the purpose of this work on the studied Bahariya Formation and its equivalent rock units, where iconic dinosaurs and other fossil fauna roamed, we attempt to improve the understanding of Egypt’s Cenomanian climate, which is reconstructed as generally warm and humid punctuated by phases of considerably drier conditions of varying duration.

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Section: Discussionsupporting

confidence: 90%

“…During drier phases, humidity indicators probably shifted their ranges more to the south, as recognized by the higher spores frequency in samples from southern Egypt (47%: [ 147 ]; up to 45%: [ 148 ]; present-abundant: [ 26 ]). However, other results from southern Egypt, such as [ 27 ] did not trace such a trend as no counting was done.…”

Section: Resultsmentioning

confidence: 99%

Vegetation and climate change at the southern margin of the Neo-Tethys during the Cenomanian (Late Cretaceous): Evidence from Egypt

et al. 2023

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“…Cretacaeiporites scabratus is distributed in the Albian-Campanian of Brazil (see VALLATI, 2010) and the Upper Albian-Santonian of northern Africa (M.S. MAHMOUD & A.E. MAHMOUD, 2007).…”

Section: Biostratigraphic Interestmentioning

confidence: 99%

Paleotropical pollen grains from the Neuquén Group, Patagonia, Argentina

Vallati¹

2013

Carnets géol.

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This paper discusses the presence of elater-bearing pollen grains and other characteristic paleotropical palynomorphs in the mid to Late Cretaceous Neuquén Group at the El Zampal locality, south of Mendoza Province, Argentina. The elaterates characterize the equatorial paleofloristic province in the Albian-Cenomanian. The species Elateroplicites africaensis is present in the pollen assemblage recovered from the lower section of the Huincul Formation, a basal unit of the studied Neuquén Group. It represents the first record of elaterbearing pollen grains in Argentina and marks their southernmost extension. Other conspicuous paleotropical elements recorded in different lithostratigraphic units of the Neuquén Group include gymnospermous polyplicate pollen grains and angiosperm pollen, including two species of the periporate pollen genus Cretacaeiporites and the triporate pollen species Confossia vulgaris. The paleobiogeographic and biostratigraphic significance of the paleotropical sporomorph record in the Cretaceous palynofloras of the Neuquén Group at El Zampal is herein discussed.

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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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Palynology of some Cretaceous mudstones from southeast Aswan, Egypt: significance to regional stratigraphy

Cited by 9 publications

References 11 publications

Vegetation and climate change at the southern margin of the Neo-Tethys during the Cenomanian (Late Cretaceous): Evidence from Egypt

Vegetation and climate change at the southern margin of the Neo-Tethys during the Cenomanian (Late Cretaceous): Evidence from Egypt

Paleotropical pollen grains from the Neuquén Group, Patagonia, Argentina

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

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