Article
Geosciences, Multidisciplinary
Asmaa F. El-Moghazy, Amr S. Deaf, Nader A. A. Edress
Summary: The Wakar Formation in the offshore concessions in the eastern Mediterranean in Egypt is an important formation for gas production. However, there are no comprehensive studies on the geochemistry and palynofacies of this formation. This study investigates the history of depositional events and reveals that the organic matter belongs to types IIIC and III of coastal and delta settings. The formation consists of iron shale and sandstone facies, and the prevailing paleoclimate is arid and semi-arid conditions.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Paleontology
Eduardo Premaor, Javier Helenes, Paulo A. Souza, Wolfgang Kalkreuth
Summary: The study found that dinoflagellate cysts assigned to the subfamily Protoperidinioideae are abundant in Miocene coastal deposits in southern Brazil, with a high richness of this subfamily. The analysis of 49 taxa identified in 18 samples indicates a middle Miocene age for these samples.
MARINE MICROPALEONTOLOGY
(2021)
Article
Ecology
Friogeir Grimsson, Silvia Ulrich, Mario Coiro, Shirley A. Graham, Bonnie F. Jacobs, Ellen D. Currano, Alexandros Xafis, Reinhard Zetter
Summary: Fossil pollen grains related to the extant Hagenia abyssinica were discovered in early Miocene Ethiopia. The presence of Hagenia in the fossil record raises questions about changes in its habitat and pollination methods over time. Study of extant anthers with specialized hairs suggests insect pollination, indicating evolution in post-mid-Miocene times to the current Afromontane habitat and ambophilous pollination.
ECOLOGY AND EVOLUTION
(2021)
Article
Chemistry, Multidisciplinary
Ahmed Mansour, Michael Wagreich, Mohamed S. Ahmed, Sameh S. Tahoun, Thomas Gentzis
Summary: Siliciclastic sediments in the north Western Desert of Egypt provide evidence for mid-Cretaceous sea-level oscillations. This study examines the geochemistry and palynological composition of upper Albian reservoirs in the area to reconstruct the changes in relative sea level during this time. The results indicate three transgressive-regressive sequence stratigraphic intervals.
Article
Geosciences, Multidisciplinary
Vikram P. Singh, Bhagwan D. Singh, Runcie P. Mathews, Alpana Singh, Vinod A. Mendhe, Subhashree Mishra, Mollika Banerjee
Summary: Through the application of organic petrography, palynofacies, and geochemistry, the origin, nature, and character of lignite deposits in the Sonari mine of Barmer Basin, Rajasthan were investigated. The results provide insights into the thermal maturation and hydrocarbon generation potentiality of these lignite-bearing deposits.
NATURAL RESOURCES RESEARCH
(2022)
Article
Geography, Physical
Yinqiang Li, Kefu Yu, Lizeng Bian, Yeman Qin, Weihua Liao, Yang Yang, Yifang Ma
Summary: The study examines the Miocene coralline algal compositions in the South China Sea to understand their role in recording sea level changes. The research reveals that early and late Miocene had higher diversity and abundance of coralline algae compared to the middle Miocene, indicating fluctuations in coral reef development and sea level during different time periods.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Geography, Physical
Mariusz Niechwedowicz, Ireneusz Walaszczyk, Marcin Barski
Summary: The study of the upper Campanian-lowermost Maastrichtian epicontinental succession in central Poland using palynological and palynofacies analyses reveals that the phytoplankton assemblages and dinoflagellate cysts responded to relative sea-level fluctuations. The recorded sea-level changes were likely of eustatic origin, with certain dinocyst species indicating warmer or cooler-water conditions. The variation in palynofacies pattern was found to be influenced by changes in terrestrial organic-matter supply, potentially caused by fluctuations in river runoff.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Multidisciplinary Sciences
Jorge Campos-Medina, German Montoya-Sanhueza, Karen Moreno, Enrique Bostelmann Torrealba, Marcelo Garcia
Summary: The Miocene Caragua fossil fauna in northern Chile contains articulated partial skeletons of Caraguatypotherium munozi with significant body size difference. The comprehensive study of the appendicular system in Notoungulata revealed that the fossil specimens can be classified as subadults and adults based on bone tissues characteristics. The study also showed marked cyclical growth and inter-skeletal variation on bone growth rates, suggesting influences from ecological and environmental factors.
Article
Geosciences, Multidisciplinary
Stefano Torricelli, Elena Menichetti, Gabriella Knezaurek
Summary: This study provides unprecedented data on organic-walled dinoflagellate cyst assemblages in the Malembo Formation. By cross-calibrating with other data, the identified dinocyst events are useful for age control and correlation in the Oligocene and lower Miocene.
JOURNAL OF AFRICAN EARTH SCIENCES
(2022)
Article
Geography, Physical
Zhu-Ding Qiu, Lu Li
Summary: This paper presents the Miocene squirrels of the Linxia Basin in Gansu Province, which reflects a relatively dry climate and open shrub-steppe environment. The analysis suggests that northern China represents a single biotic province with uniform paleoenvironment, while southern China has a humid forest biotope. The differences in squirrel distribution indicate distinct provinciality and latitudinal ecological variation in China during the Miocene.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Geography, Physical
Bianca Russo, Luciana Ferraro, Cecilia Correggia, Ines Alberico, Luca Maria Foresi, Mattia Vallefuoco, Fabrizio Lirer
Summary: A detailed study on benthic foraminiferal assemblages from the upper Burdigalian -lower Langhian of Malta Island was conducted to understand paleoenvironmental changes in the Mediterranean Basin during the early-middle Miocene. The study identified five main intervals and a benthic turnover related to climatic events. It also suggested increased seasonality affecting food flux and oxygenation at the sea-floor.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geology
Marcia Mendes, Gabrielle S. Descamps, Paulo Fernandes, Gilda Lopes, Raul Carlos G. S. Jorge, Zelia Pereira
Summary: Integrated sedimentological, palynological, and palynofacies analyses of the Arrifes section in the central Algarve Basin (southern Portugal) provided new information on the age and environments of this Lower Cretaceous sequence. The Arrifes section consists of fossiliferous limestones, marly limestones, and marls, deposited in shallow subtidal to intertidal settings. The water depth increased towards the top of the section during the Barremian, as indicated by sedimentological and palynological analyses.
CRETACEOUS RESEARCH
(2023)
Article
Environmental Sciences
Karin A. F. Zonneveld, Hendrik Grotheer, Gerard J. M. Versteegh
Summary: The study reveals the production and transport of dinoflagellate cysts in the ocean during active upwelling, highlighting their geographical and ecological significance, as well as their potential impact on marine ecosystems and environmental protection.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Multidisciplinary Sciences
Rashmi Panwar, O. P. Thakur, N. N. Dogra
Summary: The study conducted on the Kothar Section of Nilkanth, Uttarakhand, reveals a diverse palynological and palynofacies assemblage including acritarchs, pteridophytes, gymnosperms, fungal and dinoflagellates. The succession shows a transition from terrestrial warm and humid conditions to marine influences, indicating the evolution of the area from Early to Middle Eocene.
Article
Geography, Physical
Aly Baumgartner, Daniel J. Peppe
Summary: The study investigated the plant fossil assemblages from different stratigraphic intervals on Rusinga Island, Kenya, revealing variations in floral composition and environmental characteristics. The R3 flora was found to be more similar to modern tropical seasonal forests compared to other intervals, while the flora at Kiahera Hill showed higher species richness and evenness than the R3 flora.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
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)