Results 51 to 60 of about 25,161 (234)

Molecular Palaeontology Prospects From Exceptionally Preserved Eocene Brackish‐Water Bivalve Batissa sitakaraensis (Venerida: Corbiculidae) From Hokkaido, Japan

Geological Journal, EarlyView.
This study reports the exceptional preservation of the Eocene freshwater bivalve Batissa sitakaraensis from Hokkaido, Japan. Multimodal analyses reveal that both the aragonitic shell mineralogy and the delicate organic periostracum retain their original structural and chemical characteristics after millions of years.
Taro Yoshimura, Kazuki Hirota, Hiroyuki Kagi, Takashi Matsubara, Takenori Sasaki   +4 more
wiley   +1 more source

Local Structures of Se and Br in Cretaceous–Paleogene Boundary Sediments and Concentration Effects of Ferrihydrite Originating From Impact Ejecta

Geological Journal, EarlyView.
Chemical states of Se and Br atoms in the KPg boundary sediments from Stevns Klint were studied using XAFS spectroscopy. The high concentrations of Se4+ could become an index of the degree to which the global environment was soiled with dust and ash derived from impact ejecta or volcanic eruptions.
Kei‐ichiro Murai, Akira Yoshiasa, Ginga Kitahara, Makoto Tokuda, Satoko Ishimaru, Toshihiro Moriga   +5 more
wiley   +1 more source

Deposition, diagenesis, and reservoir development of the Cretaceous Lidam formation, SE Sirt Basin, Libya. [PDF]

, 2007
This study concentrates on the deposition, diagenesis and reservoir characteristics of the Upper Cretaceous (Cenomanian) Lidam Formation. Core, petrography and geochemical data were studied from five wells (P3-97, N6-97, R1-97， 3V1-59E, and 3V3-59E) in ...
Abugares, Miloud M.
core  

Gough's Cave and biomolecular archaeology: a story of evolving interpretation Archéologie biomoléculaire à la grotte de Gough's Cave : une interprétation en constante évolution

Journal of the Royal Anthropological Institute, EarlyView.
Gough's Cave is a key archaeological site that has been at heart of British archaeology for the past century. Professor Chris Stringer, whom this special issue honours, has been a key figure in excavations and research projects at the site for many decades.
William A. Marsh
wiley   +1 more source

Diagenesis of organic-rich shale in Second Member of Kongdian Formation in Cangdong Sag and its influence on reservoir characteristics

Youqi dizhi yu caishoulu
The diagenesis and evolution of organic-rich shale have an important influence on the characteristics of shale reservoirs， but the relationship between diagenesis and reservoir characteristics of organic-rich shale in the Second Member of Kongdian
FENG Guozheng, YAN Jihua, PU Xiugang, CHEN Shiyue, YIN Lingzhi, LA Weihao, HAN Wenzhong, ZHANG Wei   +7 more
doaj   +1 more source

Sedimentary environment, sequence stratigraphy, diagenesis and geochemistry of the carbonate Ruteh Formation in north of Mahabad section [PDF]

Journal of Stratigraphy and Sedimentology Researches, 2019
The Ruteh Formation is the second sedimentary cycle in Alborz basin. The petrography and laboratory studies of these deposits led to the identification of 15 microfacies which were deposited in seven sub-environments including supratidal, intertidal ...
Youssef Mohamaddi Moghaddas, Rahim Mahari, Rahim Shabanian, Adel Najafzadeh   +3 more
doaj   +1 more source

Sedimentological, Diagenetic, and Sequence Stratigraphic Controls on the Shallow to Marginal Marine Carbonates of the Middle Jurassic Samana Suk Formation, North Pakistan

Journal of Marine Science and Engineering, 2023
This study presents a thorough analysis of the sedimentology, diagenesis, and sequence stratigraphy of the Middle Jurassic Samana Suk Formation in the Hazara Basin of northern Pakistan.
Shazia Qamar, Mumtaz Muhammad Shah, Hammad Tariq Janjuhah, George Kontakiotis, Amir Shahzad, Evangelia Besiou   +5 more
doaj   +1 more source

Body Size Regulates Niche Overlap Asymmetry in the Subtropical Andes Rain Shadow: Isotopic Paleoecology of Oligocene South American Ungulates

Integrative Zoology, EarlyView.
This study provides the first isotopic analysis of Oligocene mammals from Quebrada Fiera, Mendoza, Argentina, filling a major gap in South American paleontology. It reveals a latitudinal gradient in aridity due to the Andean rain shadow and highlights the role of (semi)permanent water bodies in sustaining diverse herbivore communities. Additionally, it
Dánae Sanz‐Pérez, Santiago Hernández Del Pino, Esperanza Cerdeño, Manuel Hernández Fernández, Laura Domingo   +4 more
wiley   +1 more source

Role of authigenic clay minerals in preserving primary porosity and permeability of the sandstone hydrocarbon reservoirs [PDF]

Journal of Stratigraphy and Sedimentology Researches, 2019
Among different diagenetic alterations, quartz cements are the foremost porosity and permeability destroying cement in deeply buried (>2 km) sandstones.
Masoumeh Kordi
doaj   +1 more source

Diagenetic Study of Marrón Emperador Ornamental Stone (Upper Cretaceous, SE Spain)

Applied Sciences, 2023
The “Marrón Emperador” ornamental stone is known for its characteristic deep brown colour filled with white spots and veins. It consists of a brecciated dolostone with different generations of calcite/dolomite veins and veinlets that represent repeated ...
María Concepción Muñoz-Cervera, Juan Carlos Cañaveras   +1 more
doaj   +1 more source