Results 91 to 100 of about 53,108 (242)

Investigation of the Boundary between Abderaz and Kalat Formations Based on Calcareous Nannofossils in West Kopet-Dagh (NE IRAN)

, 2013
The biostratigraphy of calcareous nannofossils of the Cretaceous is investigated in the boundary between Abderaz and Kalat Formations through the record of species richness, diversity and distribution patterns in the west Kopet-Dagh region.
M. Moheghy, F. Hadavi, B. Rahimi
semanticscholar   +1 more source

Calcareous nannofossils and Mesozoic oceanic anoxic events

Marine Micropaleontology, 2004
Abstract Twenty-five years ago, Mesozoic oceanic anoxic events (OAEs) were documented and formalised as intervals of widespread to global deposition of organic matter. The Toarcian, Early Aptian (OAE1a) and latest Cenomanian (OAE2) OAEs are truly global in nature, commonly carbonate-poor, and typically represented by organic carbon-rich black shales.
openaire   +1 more source

Late miocene calcareous nannofossils and biostratigraphy of the sw tumaco onshore basin (colombian pacific) [PDF]

, 2013
Se presenta el estudio bioestratigráfico semicuantitativo de nanofósiles calcáreos para tres secciones estratigráficas del Mioceno superior de la costa Pacífica de Colombia (SW de la Cuenca Tumaco costa adentro).
Bedoya Agudelo, Erika Lorena, Flores, José Abel, Pardo, Andrés   +2 more
core   +2 more sources

Integrated microfossil biostratigraphy, facies distribution, and depositional sequences of the upper Turonian to Campanian succession in northeast Egypt and Jordan [PDF]

, 2016
Six upper Turonian to Campanian sections in Egypt (Sinai) and Jordan were studied for their microfossil biostratigraphy (calcareous nannofossils and planktonic foraminifera), facies distribution and sequence stratigraphic frameworks.
Ahmad, Fayez, Farouk, Sherif, Marzouk, Akmal M., Powell, John H.   +3 more
core   +1 more source

A model for the concomitant early formation of dolomite and fibrous clays in coastal bay systems: Evidence from the Eocene (Paris Basin, France)

Sedimentology, Volume 72, Issue 6, Page 1860-1898, October 2025.
ABSTRACT Detailed analysis of Lutetian–Bartonian deposits in the Paris Basin (‘Marnes et Caillasses’ Formation) provides new evidence of concomitant magnesian fibrous clays (palygorskite and sepiolite) and early microcrystalline dolomite. Although relatively uncommon in sedimentary archives, palygorskite and sepiolite are found in a wide range of ...
Julien Talon, Pierre Pellenard, Jean‐Marc Baele, Florence Quesnel, Justine Briais, Alina Iakovleva, Christian Dupuis, Ludovic Bruneau, Emmanuelle Vennin   +8 more
wiley   +1 more source

Implications of Northwest Pacific Ocean Eolian Records for Northern Hemisphere Wind System Evolution

Geophysical Research Letters, Volume 52, Issue 17, 16 September 2025.
Abstract Northwest Pacific Ocean sedimentary eolian records preserve abundant information about the temporal evolution of Northern Hemisphere atmospheric circulation. The large spatial scale of these wind systems means that they play key roles in driving dust transportation from inland areas to the open ocean. However, the altitudinal range of dominant
Qiang Zhang, Andrew P. Roberts, Xiangyu Li, Zhongshi Zhang, Qingzhen Hao, Zhengquan Yao, Xu Tang, Lixia Ju, Jianxing Liu, Hengheng Zhao, Ke Gui, Huizheng Che, Xuefa Shi, Qingsong Liu, Zhengtang Guo   +14 more
wiley   +1 more source

Calcareous nannofossil communities during Late Triassic Mass Extinction and Early Jurassic recovery in the NW Tethys: evidence from Slovakia, Western Carpathians [PDF]

Acta Palaeontologica Polonica
The first calcareous nannoplankton extinction and recovery close to the Triassic/Jurassic boundary (TJB) were studied in two Tatra Mountains sections of Kardolína and Furkaska.
Katarína Holcová, Matic Rifl, Jozef Michalík   +2 more
doaj   +1 more source

NEW BIOSTRATIGRAPHIC AND LITHOLOGICAL DATA ON THE NEOGENE AND QUATERNARY OF THE LIVORNO AREA (TUSCANY, CENTRAL ITALY)

Rivista Italiana di Paleontologia e Stratigrafia, 2020
Lithofacies analyses and datings using calcareous nannofossils, proved to be an excellent opportunity to understand the palaeoenvironmental evolution of the area of the Tuscan coast, washed up by the Ligurian Sea.
RITA CATANZARITI, SIMONE DA PRATO
doaj   +1 more source

Offshore Record of Explosive Volcanic Eruptions in the Southern Part of the Panamá Basin During the Past 10 Myr: 1. Tephrostratigraphy, Cross‐Correlations and Geochemical Characterization

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 9, September 2025.
Abstract Northern Andean volcanism is characterized by an intense Quaternary activity, whose onshore deposits have partly covered Mio‐Pliocene products associated with the early development of the arc, making it difficult to obtain an exhaustive catalog of past eruptions.
Mathilde Bablon, Marianne Saillard, François Michaud, François Nauret, Pablo Samaniego, Jean‐Luc Le Pennec, Silvana Hidalgo, Gueorgui Ratzov, Jean‐Luc Devidal, François Orange, Céline Liorzou   +10 more
wiley   +1 more source

Petrogenesis of diachronous mixed siliciclastic-carbonate megafacies in the cool-water Oligocene Tikorangi Formation, Taranaki Basin, New Zealand [PDF]

, 2003
The Oligocene (Whaingaroan-Waitakian) Tikorangi Formation is a totally subsurface, lithostratigraphically complex, mixed siliciclastic-limestone-rich sequence forming an important fracture reservoir within Taranaki Basin, New Zealand.
Berggren W. A., Bernecker T., Driscoll N. W., Hood S. D., Hudson D. S., Hume T. R., Mauri S., Morgans H. E. G., Mullins H. T., Mullins H. T., Naish T. R., Nelson C. S., Nelson C. S., Palmer J. A., Rao C. P., Scott G. H., Simpson J., Tucker M., Westphal H., Young J.   +19 more
core   +2 more sources