Results 11 to 20 of about 242 (131)

Early eukaryotic microfossils of the late Palaeoproterozoic Limbunya Group, Birrindudu Basin, northern Australia

Papers in Palaeontology, Volume 9, Issue 6, November/December 2023., 2023
Abstract Fine‐grained, siliciclastic units of the >1642 ± 3.9 Ma late Palaeoproterozoic Limbunya Group, Birrindudu Basin host rich, well‐preserved organic‐walled microfossil assemblages that include members of total‐group eukaryotes. These assemblages include taxa characteristic of this interval such as Tappania plana and Satka favosa, as well as less ...
Leigh Anne Riedman, Susannah M. Porter, Maxwell A. Lechte, Angelo dos Santos, Galen P. Halverson   +4 more
wiley   +1 more source

The role of siliciclastics in carbonate fabric diversity and preservation: A case study from the Neoproterozoic carbonate − siliciclastic Horse Thief Springs Formation, Death Valley

Sedimentology, Volume 69, Issue 5, Page 2284-2318, August 2022., 2022
Abstract The sedimentary record of the Pahrump Group in Death Valley comprises well‐exposed successions of mixed carbonate and siliciclastic deposits. Despite the abundance of studies focussing on the depositional dynamics of mixed carbonate – siliciclastic deposition in the Phanerozoic, the record of similar Proterozoic examples is comparatively ...
Daniel Smrzka, Kristian Kuzel, Domenico Chiarella, Michael M. Joachimski, Thomas M. Vandyk, Christoph Kettler, Dan P. Le Heron, Stephen Lokier   +7 more
wiley   +1 more source

Constraints on the origins of iron silicide spherules in ultrahigh‐temperature distal impact ejecta

Meteoritics &Planetary Science, Volume 56, Issue 7, Page 1369-1405, July 2021., 2021
Abstract Terrestrially occurring iron silicide spherules, described in the geological literature for 160 years as cosmogenic and approved as “extraterrestrial” minerals by IMA CNMMN in 1984, so far have escaped any serious examination by meteoriticists.
Sergei Batovrin, Boris Lipovsky, Yury Gulbin, Yury Pushkarev, Yury A. Shukolyukov, Donald Brownlee   +5 more
wiley   +1 more source

A Cryptic Alternative for the Evolution of Hyphae

BioEssays, Volume 42, Issue 6, June 2020., 2020
The current view that hyphae evolved about 400 million years ago when plants and fungi colonized land is challenged. Recent recognition of a deep biosphere fossil record provides an alternative view on hyphae: one where the fundamental functions of hyphae developed in ancient cryptic habitats and already where adapted for a terrestrial life‐style when ...
Magnus Ivarsson, Henrik Drake, Stefan Bengtson, Birger Rasmussen   +3 more
wiley   +1 more source

TIME CONSTRAINTS ON THE FORMATION OF THE KANDALAKSHA AND KERETSK GRABENS OF THE WHITE SEA PALEO-RIFT SYSTEM FROM NEW ISOTOPIC GEOCHRONOLOGICAL DATA

Геодинамика и тектонофизика, 2021
Initially, the age and stratigraphic position of the Tersk formation were determined with respect to the fact that this formation overlaps the Early Proterozoic granitoids.
N. B. Kuznetsov, A. S. Baluev, E. N. Terekhov, S. Yu. Kolodyazhnyi, E. S. Przhiyalgovskii, T. V. Romanyuk, A. S. Dubensky, V. S. Sheshukov, S. M. Lyapunov, T. B. Bayanova, P. A. Serov   +10 more
doaj   +1 more source

The Precambrian in the Sub-Polar Urals : the chronostratigraphic aspect.

Transactions of the Karelian Research Centre of the Russian Academy of Sciences, 2019
New geochronological data on the Lower and Upper Proterozoic complexes of the Sub-Polar Urals are presented, where the outcropping Precambrian section in the Lyapin anticlinoriumis the stratotype for the entire Timan-Northern Urals region.
Александр Михайлович Пыстин, Юлия Ивановна Пыстина, Alexander Pystin, Yulia Pystina   +3 more
doaj   +1 more source

Reconstruction of the conditions for the formation of red-colored sandstones of the Tersky coast based on a comparative analysis of the structure of ancient and modern deposits (Kola Peninsula)

Vestnik MGTU, 2023
The paper presents the results of studying the Riphean red-colored sandstones of the Tersky coast of the White Sea. 21 structural elements characterizing the conditions of rock formation have been considered, including 15 ancient and 6 modern deposits ...
Neradovsky Yu. N.
doaj   +1 more source

A fishtail well design for cyclic steam injection—A case study from Yarega heavy oil field in Russia

Energy Science &Engineering, Volume 7, Issue 6, Page 2437-2455, December 2019., 2019
The joint application of cyclic steam injection technology with fishtail wells assists in reducing the travel time the mobilized oil takes to arrive at a well perforation. Our results demonstrate that the synergy between these two strategies can further improve recoveries in heavy oil reservoirs. In addition to the technical advantage of this strategy,
German A. Abzaletdinov, Temitope Ajayi, Youssuf A. Elnoamany, Sergey Durkin, Ipsita Gupta   +4 more
wiley   +1 more source

Rare Earths in Geological Formations of Central Region of the Dniester River Basin, Republic of Moldova

Advances in Geology, Volume 2015, Issue 1, 2015., 2015
In the different varieties of crystalline basement of Archean and Proterozoic age and in Vendian (Ediacaran) basal layers of platform coverture in the Central Basin of the Dniester River were found relatively high concentrations of Lanthanum, Cerium, Yttrium, Ytterbium, and Scandium.
Aurelia Popuiac, Giovanni Martinelli
wiley   +1 more source

Carbon and Oxygen Isotopic Stratigraphy of Mesoproterozoic Carbonate Sequences (1.6–1.4 Ga) from Yanshan in North China

International Journal of Oceanography, Volume 2011, Issue 1, 2011., 2011
In Yanshan, located in the northern part of North China, Mesoproterozoic carbonate sequences (1.6–1.4 Ga) form a 10, 000 m thick succession in an aulacogen basin. Carbon and oxygen isotope (δ13O and δ18O, resp.) data were obtained from 110 carbonate samples across three sections of these Mesoproterozoic deposits. From the early to late Mesoproterozoic,
Kuang Hongwei, Liu Yongqing, Li Jiahua, Peng Nan, Luo Shunshe, Cen Chao, Henk Brinkhuis   +6 more
wiley   +1 more source