Article
Geosciences, Multidisciplinary
Mahmoud Faris, Sherif Farouk, Sreepat Jain, Manal Shabaan
Summary: This study provides a review and evaluation of calcareous nannofossils from 28 wells in the Gulf of Suez, North Nile Delta, and surface sections in west central Sinai, Egypt. Fifteen calcareous nannofossil zones from Miocene to Pliocene are described and correlated regionally and globally. The study also briefly discusses the boundaries of the Miocene and Pliocene stages.
JOURNAL OF AFRICAN EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Haitham M. Ayyad, Abdel Galil A. Hewaidy, Sherif Farouk, Ahmed Samir, Youssef S. Bazeen
Summary: The calcareous nannofossil and foraminiferal analyses have been integrated to build a detailed chronostratigraphic scheme for the upper Oligocene-middle Miocene succession. The palaeoenvironmental conditions were assessed using the preferences of calcareous nannofossil species and foraminifera, indicating the influence of regional tectonic events on the sedimentation regime.
GEOLOGICAL JOURNAL
(2023)
Article
Geology
David J. King, Bridget S. Wade, C. Giles Miller
Summary: Planktonic foraminifera exhibit either sinistral or dextral coiling. The prevalence of coiling direction can change within morphospecies over time. Despite known preferential coiling directions in many species, no coiling shifts have been applied beyond the late Miocene. This study investigates selected Miocene species and confirms a coiling shift in the mid Miocene at approximately 15 Ma.
NEWSLETTERS ON STRATIGRAPHY
(2023)
Article
Geology
Stefan Jozsa, Eiichi Setoyama, Halasova Eva, Stefan Nagy
Summary: A diverse and abundant assemblage of deep-water agglutinated foraminifera has been discovered in the Central Western Carpathians. These foraminifera show changes in response to trophic regime shift and decreasing oxygenation within a relatively short time-series.
CRETACEOUS RESEARCH
(2023)
Article
Geology
Arianna V. Del Gaudio, Werner E. Piller, Gerald Auer, Walter Kurz
Summary: The Izu-Bonin-Mariana arc-system in the NW Pacific is an intensively studied convergent margin that contains active serpentinite mud volcanism. International Ocean Discovery Program conducted drilling expeditions to obtain samples from three serpentinite mud volcanoes in the Mariana region, providing valuable information on the latest phase of seamount activity and changes in sedimentation rates.
NEWSLETTERS ON STRATIGRAPHY
(2022)
Article
Paleontology
Yasser Salama, Mostafa Sayed, Shaban Saber, Ibrahim Abd El-Gaied
Summary: The Eocene succession in Beni Suef-El Zaafarana District is characterized by rich planktonic foraminiferal assemblages, with three biozones identified and correlated with neighboring regions. Changes in planktonic/benthic foraminiferal ratio suggest a shallowing upward trend in paleodepth, supporting the subdivision of the Eocene succession into four depositional sequences in alignment with global sea-level changes.
PALAEONTOLOGIA ELECTRONICA
(2021)
Article
Geology
Brian T. Huber, Nataliya A. Tur, Jean Self-Trail, Kenneth G. MacLeod
Summary: The study analyzed the distribution of well-preserved and diverse planktonic foraminifera and calcareous nannofossils over the past 10 million years in the western subtropical North Atlantic. Through age models constructed based on foram, nannofossil, and magnetic polarity datum events, reliable temporal correlation framework was established for the sites, enabling comparisons of species richness and abundance among sites. The study also revealed significant extinction events and hiatuses at specific time intervals linked to global warming events and changes in deep-water circulation patterns.
CRETACEOUS RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Abdalla Shahin, Samar El Khawagah, Banan Shahin
Summary: In this study, the planktonic foraminiferal assemblages in the N. El Faras-1X Well, Qattara Depression, Egypt, were tracked. A total of 77 planktonic foraminiferal species were recorded, and 12 planktonic foraminiferal biozones were identified. The boundaries of several stages and epochs were accurately determined. The reconstructed sea-level curve revealed two major transgressive-regressive cycles.
GEOLOGICAL JOURNAL
(2023)
Article
Paleontology
Ahmed Ismail, Mahmoud Faris, Adel El Shahawy, Ahmed Abdel Naby
Summary: This study investigates the benthic foraminifera of the Maastrichtian-Ypresian interval in El Hasana area, Central Sinai, Egypt, to understand the biostratigraphic and paleoecologic changes across the K/Pg and P/E boundaries. It identifies five benthic assemblages and deduces paleoenvironmental conditions and extinction/recovery patterns.
PALAEONTOGRAPHICA ABTEILUNG A-PALAOZOOLOGIE-STRATIGRAPHIE
(2022)
Article
Geology
Fabio Lamm, Francisco Henrique de Oliveira Lima, Cleber Fernandes Alves, Ismar de Souza Carvalho
Summary: The biostratigraphy of the Aptian-Albian interval using calcareous nannofossils has been continuously developed and applied. However, the scarcity of complete marine sections and taxonomic ambiguities pose challenges in stratigraphic studies of this interval. The Poggio le Guaine section in central Italy offers a unique opportunity with a complete and undisturbed sedimentary succession of the Aptian-Albian interval. This study aims to provide a detailed biostratigraphic zonation, calibrate it with previous works, and discuss important bioevents.
CRETACEOUS RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Ikhlas Alhejoj, M. Faris, F. Ahmad, S. Farouk, J. Sreepat, G. Musa, M. Shama
Summary: This study presents the calcareous nannofossil biostratigraphy and bioevents of the Ypresian/Lutetian boundary duration from three sections in Sinai, Egypt and Jordan for the first time. The boundary is defined by the LO of Blackites inflatus, which is slightly above the LO of Turborotalia frontosa. The data is consistent with the GSSP of the base of Lutetian, where the LO of B. inflatus also marks the base of NP14b/CP12b subzones. Discoaster sublodoensis, D. saiipenensis, D. bifax, D. martini, and Tribrachiatus orthostylus show diachronous occurrences.
JOURNAL OF AFRICAN EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Abdalla Shahin
Summary: The foraminiferal assemblages in the Campanian-Early Danian succession at Gabal Nezzazat, Egypt are studied and compared with other regions globally. The biozones of planktonic foraminifera and benthic foraminifera are identified and correlated, and the reconstructed sea-level curve reveals multiple global sea-level fall events.
GEOLOGICAL JOURNAL
(2023)
Article
Geosciences, Multidisciplinary
Yasser F. Salama, Mansour H. Al-Hashim, Michael G. Grammer, Hisham A. Gahlan, Hesham Al-Asmar, Ibrahim M. Abd El-Gaied
Summary: The study of Aptian-Cenomanian formations in Sinai, Egypt, reveals lateral and vertical changes in benthic communities, with different species of microbenthos dominating different deposits. A total of 90 foraminifera species were identified to establish biostratigraphy and show the division of planktonic foraminiferal zones. The benthic fauna shifts observed in the study suggest a correlation with major sea transgressions that affected the Sinai region during the Albian and Cenomanian periods.
JOURNAL OF AFRICAN EARTH SCIENCES
(2021)
Article
Geography, Physical
Yi Zhang, Xuan Liu, David K. Watkins, Mauro Daniel Rodrigues Bruno, Hanwei Yao, Kaibo Han, Huifang Guo, Shuaipeng Zhu, Xi Chen
Summary: Based on the study of the Nirang section in the Tethys Himalayas, it is found that the sea surface temperature in the eastern Tethys during the Cretaceous Period underwent significant changes, including both short-term and long-term warming and cooling events. The northward drift of the Indian continent towards the equator is likely responsible for the sustained warmth in the Tethys Himalayas.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Aziz M. Abu Shama
Summary: This study uses calcareous nannofossils to resolve the controversies surrounding the occurrence of the upper Eocene in west-central Sinai. The presence of Eocene calcareous nannofossil zones NP15 to NP18 was identified in Wadi Thal, west-central Sinai. Various calcareous nannofossil bioevents were used to approximate the Priabonian in this region.
JOURNAL OF AFRICAN EARTH SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Abdel Galil A. Hewaidy, Haitham M. Ayyad, Mohamed W. Abd El-Moghny, Osama Gameel
GEOSCIENCES JOURNAL
(2019)
Article
Geosciences, Multidisciplinary
Abdel Galil A. Hewaidy, Sherif Farouk, Youssef S. Bazeen
GEOLOGICAL JOURNAL
(2020)
Article
Geosciences, Multidisciplinary
Haitham M. Ayyad, Mohamed Fathy, Abdel Galil A. Hewaidy, Ahmed Abdallah
MARINE AND PETROLEUM GEOLOGY
(2020)
Article
Geosciences, Multidisciplinary
Haitham M. Ayyad, Abdel Galil A. Hewaidy, Naser A. Al-Labaidy
Summary: The Miocene sequences in the northwest of the Gulf of Suez represent transitional zones between carbonate-dominated and siliciclastic-dominated strata. This study examines the sequence stratigraphy of the Sadat Area, utilizing biostratigraphic data and microfacies analysis to contribute to the understanding of the geology of the studied successions and syn-rift deposition. The results show the distinction of four genetic Miocene sequences, primarily deposited in lagoon to outer-shelf settings. The study highlights the influence of local tectonic activity and eustatic sea-level changes on Miocene deposition in the area.
GEOLOGICAL JOURNAL
(2022)
Article
Paleontology
Kamel H. Mahfouz, Nageh A. Obaidalla, Abdel Galil A. Hewaidy, Alaa Mostafa, Islam El-Sheikh
Summary: Integrated field, litho- and bio-stratigraphic analyses were conducted on three Maastrichtian-Paleocene successions in the Safaga-Quseir region of Egypt. The study identified eleven planktonic foraminiferal zones representing four hiatuses caused by three syn-sedimentary tectonic events. These events relate to the Syrian Arc Orogeny, impacting the sedimentary basin evolution.
MARINE MICROPALEONTOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Haitham M. Ayyad, Abdel Galil A. Hewaidy, Sherif Farouk, Ahmed Samir, Youssef S. Bazeen
Summary: The calcareous nannofossil and foraminiferal analyses have been integrated to build a detailed chronostratigraphic scheme for the upper Oligocene-middle Miocene succession. The palaeoenvironmental conditions were assessed using the preferences of calcareous nannofossil species and foraminifera, indicating the influence of regional tectonic events on the sedimentation regime.
GEOLOGICAL JOURNAL
(2023)
Article
Geosciences, Multidisciplinary
Haitham M. M. Ayyad, Mohamed W. Abd El-Moghny, Hesham Abuseda, Ahmed Samir, Youssef S. S. Bazeen
Summary: The lower Eocene carbonate rocks in Egypt play a crucial role in the country's petroleum system, acting as vertical seals or source-reservoir rocks. However, there has been limited research on their diagenetic history, pore system, petrophysical characteristics, and sequence stratigraphic framework in relation to global sequences.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Haitham M. Ayyad, Abdel Galil A. Hewaidy, Mustafa Omar, Mohamed Fathy
Summary: This study aims to establish a stratigraphic sequence framework, determine the age of the Suez Rift commencement, and assess reservoir quality. The research findings indicate that the rifting in the Gulf of Suez started at 23.53 million years ago. Overall, this study is of great importance for the distribution of sedimentary deposits and resource development in the region.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geology
Youssef S. Bazeen, Walid G. Kassab, El Sayed M. Moneer, Gebely A. Abu El-Kheir, Mohamed K. Abdelgawad, Haitham M. Ayyad
Summary: This study investigates the Maastrichtian-Danian succession in the Abu Minqar section of the Western Desert of Egypt, using an integrated analysis of biostratigraphy and chemostratigraphy. The results suggest that regional tectonics played a substantial role in the depositional history and paleoenvironmental circumstances of the southern Tethys margin.
CRETACEOUS RESEARCH
(2024)
Article
Geosciences, Multidisciplinary
Abdel-Galil A. Hewaidy, Abdel-Mohsen M. Morsi, Ahmed Samir
Summary: The detailed examination of ostracod faunal content in the Maastrichtian-Paleocene succession in the Dakhla Oasis, Western Desert, Egypt, revealed 36 ostracod species and subspecies assigned to 25 genera. The comparison of species record across different areas suggests a remarkable faunal turnover across the K/Pg boundary. The ostracod assemblages in the Maastrichtian and Paleocene indicate different neritic settings.
JOURNAL OF AFRICAN EARTH SCIENCES
(2021)
Article
Biology
Abdel Galil A. Hewaidy, Gamal M. El Qot, El Sayed M. Moneer
Summary: The study of bivalves in the Kharga Oasis of Egypt revealed different paleobiogeographic distributions, with Late Cretaceous to Maastrichtian bivalves showing a strong marine connection with the South Tethyan province and other regions, while early Eocene bivalves were more limited to the Egyptian territory.
HISTORICAL BIOLOGY
(2021)
Article
Paleontology
Abdel-Mohsen M. Morsi, Abdel-Galil A. Hewaidy, Ahmed Samir
REVUE DE MICROPALEONTOLOGIE
(2019)
Article
Geosciences, Multidisciplinary
Samuel Yaw Danso, Yi Ma, Adams Osman, Isaac Yeboah Addo
Summary: This study conducted a spatial assessment and mapping of flood hazards in the Sekondi-Takoradi Metropolis (STM) of Ghana using the Analytical Hierarchy Process (AHP) and geographical information system. The results indicate that about 12% of STM lands are in very high flood zones and 24% are in high flood zones. The lower portions of STM are identified as the most susceptible to inundation. These findings provide valuable insights for effective flood planning and prevention in STM.
JOURNAL OF AFRICAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Kesyton Oyamenda Ozegin, Stephen Olubusola Ilugbo
Summary: The study utilizes analytical hierarchical process and geoinformatics-based approaches to define groundwater potential zones in Edo State, Nigeria. The results show that high groundwater potential zones are mainly located in Edo-central and isolated portions of Edo-south, while low to very low potential zones are found in the study's northern region.
JOURNAL OF AFRICAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Maham Eboubekrine Sedigh, Houssa Ouali, Michel Jebrak, Abdelkader Mokhtari
Summary: The carbonatites from the Richat dome in Mauritania are unique and underdocumented geological features. This study provides insight into the mineralogy and petrogenesis of the carbonatites, revealing three identified types and their association with spinel-bearing peridotite. The geochemical characteristics of the Richat carbonatites are similar to other Cretaceous alkaline carbonatite occurrences in different regions, suggesting a common geological process. The reactivation of a deep pan-African lineament is considered a fundamental factor in the formation of the Richat carbonatites.
JOURNAL OF AFRICAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Riadh Aouissi, Gamal Mohamed El Qot, Sihem Salmi-Laouar, Catalina Gomez-Espinosa, Blanca E. Buitron-Sanchez
Summary: Twenty-one gastropod species have been identified in the Cenomanian deposits of Bellezma-Aures mountains, eastern Saharan Atlas, Algeria, with four of them recorded for the first time in the Batna mountains. These gastropods are mainly found in the 'Marnes de Smail' Formation, and their community changes may be attributed to minor sea-level fluctuations, sedimentation rate variations, and hydrodynamics. The paleobiogeographic distribution of these gastropod assemblages indicates a tethyan affinity and faunal exchange during that time interval.
JOURNAL OF AFRICAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Behnam Esmaeili, Sirous Hosseinzadeh, Ali Kadkhodaie, David A. Wood, Samira Akbarzadeh
Summary: This research applies image analysis and clustering algorithms to estimate porosity and permeability of petroleum reservoir rocks, and demonstrates that the results from image analysis are consistent with traditional analysis methods, with acceptable correlation. In addition, different depositional environments and hydraulic flow units are identified through image analysis.
JOURNAL OF AFRICAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Jianqi Zhuang, Jianbing Peng, Zhenhong Li, Yanqiu Leng, Xinghua Zhu, Weiliang Huang, Zhijie Jia, Yang Liu, Yi Zhu
Summary: The study on gully erosion in the East African Rift Valley of Kenya reveals that human activities and rainstorms are the main factors causing erosion. Gully erosion poses a serious threat to the ecological environment, particularly the man-made and fissure-induced gullies that should be further investigated.
JOURNAL OF AFRICAN EARTH SCIENCES
(2024)