Results 51 to 60 of about 3,539 (164)

Ultrastructural Perspectives on the Biology and Taphonomy of Tonian Microfossils From the Draken Formation, Spitsbergen

Geobiology, Volume 22, Issue 6, November/December 2024.
ABSTRACT Silicified peritidal carbonates of the Tonian Draken Formation, Spitsbergen, contain highly diverse and well‐preserved microfossil assemblages dominated by filamentous microbial mats, but also including diverse benthic and/or allochthonous (possibly planktonic) microorganisms. Here, we characterize eight morphospecies in focused ion beam (FIB)
Alexandre Fadel, Kevin Lepot, Sylvain Bernard, Ahmed Addad, Armelle Riboulleau, Andrew H. Knoll   +5 more
wiley   +1 more source

Acritarchs from the Abbaye de Villers and Tribotte Formations in their type section of the Thyle river valley (Middle Ordovician, Brabant Massif, Belgium) and their stratigraphic implications [PDF]

, 2011
Reinvestigation of the Thyle river section, in the southern part of the Brabant Massif, has led to a better understanding of acritarch distribution in the Middle Ordovician Abbaye de Villers and Tribotte formations, and their stratigraphical significance
Vanguestaine, M., Wauthoz, B.
core  

Evolution of West‐East Contrast in the Subarctic Pacific Gyre During the Plio‐Pleistocene Based on Palynological Evidence at ODP Sites 882 and 887

Paleoceanography and Paleoclimatology, Volume 39, Issue 9, September 2024.
Abstract Fragmentary and contradictory evidence prevents a clear understanding of the possible role of the North Pacific Ocean surface on the ice‐sheet evolution. New palynological data encompassing the Pliocene and Pleistocene at Ocean Drilling Program Site 882 in the northwest Pacific document sea‐surface conditions from dinoflagellate cysts in ...
C. Zorzi, A. de Vernal
wiley   +1 more source

Biostratigraphy and palaeogeography of lower Devonian Chitinozoans, from East and West Moesia, Romania [PDF]

, 2005
The knowledge on the biostratigraphy of Moesia has been supplemented based on chitinozoan assemblages in two boreholes, one from East Moesia and the second one from West Moesia. Previous contributions on chitinozoans, acritarchs and miospores, using only
Vaida, M., Verniers, J.
core  

The palaeobiological significance of clustering in acritarchs: a case study from the early Cambrian of North Greenland

Palaeontology, Volume 67, Issue 5, September/October 2024.
Abstract Aggregated clusters of acritarchs are relatively common among assemblages of organic‐walled microfossils, yet such associations have received relatively little attention. Here we report a new diversity of acritarch clusters from the early Cambrian Buen Formation of North Greenland.
Elise Wallet, Ben J. Slater, Sebastian Willman   +2 more
wiley   +1 more source

Evidence for Low‐Pressure Crustal Anatexis During the Northeast Atlantic Break‐Up

Geochemistry, Geophysics, Geosystems, Volume 25, Issue 7, July 2024.
Abstract While basaltic volcanism is dominant during rifting and continental breakup, felsic magmatism may be a significant component of some rift margins. During International Ocean Discovery Program (IODP) Expedition 396 on the continental margin of Norway, a graphite‐garnet‐cordierite bearing dacitic unit (the Mimir dacite) was recovered in two ...
A. M. Morris, S. Lambart, M. A. Stearns, J. R. Bowman, M. T. Jones, G. Mohn, G. Andrews, J. Millett, C. Tegner, S. Chatterjee, J. Frieling, P. Guo, D. W. Jolley, E. H. Cunningham, C. Berndt, S. Planke, C. A. Alvarez Zarikian, P. Betlem, H. Brinkhuis, M. Christopoulou, E. Ferré, I. Y. Filina, D. T. Harper, J. Longman, R. P. Scherer, N. Varela, W. Xu, S. L. Yager, A. Agarwal, V. J. Clementi   +29 more
wiley   +1 more source

Paleoenvironment of the Dalichai Formation, northeastern Semnan [PDF]

Journal of Stratigraphy and Sedimentology Researches, 2015
Palaeonvironment of the Dalichai Formation, northeastern Semnan, is envisaged based on 69 samples studied palynologically. Diverse and well-preserved palynofloras, viz., miospores, dinoflagellate cysts, foraminiferal test linings, acritarchs, wood debris
Fereshteh Sajjadi, Firoozeh Hashemi Yazdi, Navid Navidi Izad, Fereshteh Sajjadi, Afsaneh Dehbozorgi   +4 more
doaj   +2 more sources

Diversity and distribution of Cambrian acritarchs from the Siberian and East-European platforms - a generalized scheme

Carnets de Géologie, 2005
The study of acritarchs in Russia was initiated by Naumova and Timofeev in the early 50s. Their initial results showed the high potential of these microfossils for biostratigraphy and was followed by a remarkable degree of research activity in the 70s ...
Raevskaya Elena
doaj  

Palynofloras of the Chigua (Devonian) and Malimán (Mississippian) formations from the Precordillera Argentina: age, correlation and discussion of the D/C boundary [PDF]

, 2009
Se presenta el análisis cualitativo y cuantitativo de las asociaciones palinológicas obtenidas de las formaciones Chigua (Devónico) y Malimán (Mississippiano), aflorantes en la Cuenca Río Blanco, Precordillera Argentina.
Azcuy, Carlos Leopoldo, Di Pasquo Lartigue, Maria, Rodriguez Amenabar, Cecilia   +2 more
core  

Carbonate production and reef building under ferruginous seawater conditions in the Cambrian rift branches of the Avalon Zone, Newfoundland

Sedimentology, Volume 71, Issue 4, Page 1245-1269, June 2024.
Abstract The characterization of carbonate production on rift basins is critical for understanding the nucleation and demise of reefs in tectonically active areas. A new petrographic and mineralogical analysis of Cambrian strata from the Avalon Zone in Newfoundland, based on scanning electron microscopy – back‐scattered electron detector and Raman ...
José Javier Álvaro, Andrea Mills
wiley   +1 more source