Article
Geography, Physical
Irisa Arney, Brenda R. Benefit, Monte L. McCrossin, Laura MacLatchy, John D. Kingston
Summary: Middle Miocene deposits at Maboko Island in Western Kenya have yielded a rich fossil mammalian record documenting a faunal shift. Isotopic evidence from fossil herbivores indicates constrained environmental variability at Maboko, ranging from open canopy forest to open woodland habitats.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Energy & Fuels
Hafidz Noor Fikri, Reinhard F. Sachsenhofer, Achim Bechtel, Doris Gross
Summary: Coal seams of different ages in the Barito Basin in Borneo were studied to compare their characteristics. The study revealed differences in peat types, flora, and climate between the Late Eocene and middle Miocene coals. The Miocene coals were significantly thicker and displayed a cyclic structure compared to the Eocene coals. The Miocene coals were dominated by more decay-resistant angiosperm trees and had a higher abundance of preserved plant tissues. Fungal activity was high in both Eocene and Miocene coals.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
Article
Geochemistry & Geophysics
Pilar Avila, Milagros Avila, Federico M. Davila, Miguel Ezpeleta, Nesvit E. Castellano
Summary: Southern Patagonia in southernmost South America is a world-class example of a slab window that formed due to the subduction of the South Chile Ridge. Using the FastScape numerical model, this study analyzed the landscape evolution and found that long-wavelength uplift geometry, including dynamic uplift and lithospheric rebound from thinning, was necessary from 12 million years ago to the Present day in order to replicate the youngest cooling ages and present-day topography.
Article
Geology
Katharine M. Loughney, Anna Harkness, Catherine Badgley
Summary: Analysis of sediment samples from the Barstow Formation in southern California revealed the presence of C4 vegetation before the expansion of C4 grasslands. Increased fire activity may have contributed to habitat opening and the spread of C4 plants.
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
Gil Machado, Manuel Casas-Gallego, Stanislaw Burliga
Summary: Salt biostratigraphy is underutilized in academic and industry studies, but it has the potential to provide valuable insights into stratigraphy, thermal maturity, paleoenvironments, and paleoecology of evaporite successions. A study in southern Poland analyzed the palynological content of the upper section of the Middle Miocene Wieliczka Formation, revealing assemblages dominated by reworked miospores and dinoflagellate cysts sourced from Cretaceous, Paleogene, and Miocene strata. The study also indicated the presence of mixed coniferous and deciduous forests, swamp and marsh vegetation, and low thermal maturation levels.
Article
Engineering, Marine
Alberto Collareta, Olivier Lambert, Felix G. Marx, Christian de Muizon, Rafael Varas-Malca, Walter Landini, Giulia Bosio, Elisa Malinverno, Karen Gariboldi, Anna Gioncada, Mario Urbina, Giovanni Bianucci
Summary: Based on a detailed palaeoecological analysis of the Miocene vertebrate assemblages in southern Peru, the study reveals the historical changes in the ancient ecosystem of the Humboldt Current, from the Middle Miocene Climatic Optimum to the subsequent cooling period. The Pisco Formation shows warm, semi-enclosed near-shore environments in the lowermost, middle Miocene sequence, while a more open setting with wide-ranging species dominates in the younger portions, reflecting the evolution of the ecosystem at that time.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Geosciences, Multidisciplinary
Elena Stiles, Camilo Montes, Carlos Jaramillo, Murray K. Gingras
Summary: The Chagres Formation on the Caribbean coast of Panama is shown to have accumulated in shallow water environments, contradicting previous interpretations of deep-water connection. This study also suggests deposition on a tectonically stable platform at the apex of the Panama orocline.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2022)
Article
Geosciences, Multidisciplinary
Orangel Aguilera, Maria Virginia Alves Martins, Ana Paula Linhares, Vinicius Tavares Kutter, Giovanni Coletti
Summary: The Bragantina Platform in the Brazilian equatorial margin is a significant onshore basin, and studying the Neogene successions in this area has great importance for future research.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Multidisciplinary Sciences
Taiwo A. Bolaji, Michael N. Oti, Mike O. Onyekonwu, Taiwo Bamidele, Michael Osuagwu, Leo Chiejina, Precious Elendu
Summary: The Niger Delta is rich in hydrocarbons, but data on basinal hydrogeology is limited. Chemical analysis of oilfield brines and seawater samples in the area revealed that the formation waters are slightly alkaline and saline, originating from connate sources with a dominance of alkali elements. The presence of feldspars and the contribution of major ions from iron oxide and carbonate minerals were also identified through saturation indices.
Article
Chemistry, Physical
Selahattin Kadir, Hulya Ates, Hulya Erkoyun, Tacit Kulah, Fahri Esenli
Summary: This study provides important insights into the tectonic-controlled hydrothermal alteration of Lower Miocene volcanic rocks in the Mustafakemalpas,a (Bursa) region, leading to the formation of economically significant kaolin deposits. The mineralogical, geochemical, and genetic contributions to the ongoing mining operation of this kaolin deposit have been thoroughly examined, shedding light on the possible application fields of the deposit.
APPLIED CLAY SCIENCE
(2022)
Article
Agronomy
Shabir Ahmad, Mushtaq Ahmad, Mohamed Fawzy Ramadan, Shazia Sultana, Alessio Papini, Fazal Ullah, Saddam Saqib, Asma Ayaz, Mansoor Ahmed Bazai, Wajid Zaman, Muhammad Zafar
Summary: This study investigated the pollen of fossil plants from the Miocene period in Pakistan, revealing its high biodiversity. The analysis of 31 samples using microscopic techniques identified 48 pollen types from 12 families. However, the preservation of floral records was found to be suboptimal.
Article
Geology
Brennan O'Connell, Rebecca J. Dorsey, Stephen T. Hasiotis, Ashleigh V. S. Hood
Summary: This study presents sedimentological and ichnological data from the Bouse Formation, which accumulated during regional transgression near the north end of the ancestral Gulf of California. The study provides evidence for a late Miocene to early Pliocene humid climate in southwestern North America, with significant facies variability at different scales documented in mixed carbonate-siliciclastic deposits.
Article
Geochemistry & Geophysics
Quan Ou, Qiang Wang, Derek A. Wyman, Xiu-Zheng Zhang, Lu-Lu Hao, Ji-Peng Zeng, Jin-Hui Yang, Hai-Xiang Zhang, Ming-Cai Hou, Yue Qi, Zhao Liu
Summary: This study investigates the mechanism of partial melting of granulites through the investigation of late Miocene (ca. 6.0 Ma) silicic volcanic rocks in the Chibuzhangcuo area of Tibet. The results suggest that the residual granulite phase and peritectic minerals are likely to be preferentially entrained into the melt due to the erosion effect caused by the continued melt flow at the sites of melting.
Article
Biology
Tatiana P. Malyshkina, David J. Ward, Mikhail Nazarkin, Gi-Soo Nam, Seung-Hyuk Kwon, Jeong-Hyun Lee, Tae-Wan Kim, Do-Kwon Kim, Doo-Sung Baek
Summary: This comprehensive study provides the first examination of the fossil elasmobranch fauna from the Miocene Duho Formation in the Pohang Basin of South Korea. It introduces a new species of kitefin shark, Dalatias orientalis. The fauna is composed of 14 species, most of which are recorded for the first time in South Korea. The assemblage includes pelagic sharks, deep-sea species, and species inhabiting insular and continental shelves, suggesting a deep-water paleoenvironment. Additionally, the goblin shark Mitsukurina owstoni is identified for the first time in the Miocene epoch.
HISTORICAL BIOLOGY
(2023)
